Core 600S-P

Search high CADR purifiers. My recommendation is if you are ok spending the money on an iqair unit, to look at other options since you have multiple rooms. What I see right now is the levoit EverestAir on clearance for $299 from Bestbuy. It is an excellent choice with a high 350 CFM CADR. (I just got 2 more at this price) a “comparable” unit is the levoit core 600s-p(sale price 299 410cfm CADR) if the Everest is not on clearance. I would buy the core at the sale price. Owning both the Everest is better in my opinion. As others have stated multiple units will provide more benefit than one large unit. However again if you are spending that money and like iqair please consider the Atem-X as it has a very high CADR. Another option is the SmartAir blast MKII. This is a beast of a unit that targets commercial applications but is generally at the same price point as the larger IQAir units but proving a much higher CADR. I have one sitting in my 600sqft Great room.

I just ordered 2 of the Levoit 600S-P.

At least 3 Levoit Core 300-P or 300S-P (CADR 143) to support \~5 ACH for your sq. footage or 1 Levoit Core 600S-P (CADR 391). For the most even coverage, I would recommend the Core 300-P/300S-P setup.

Cheapest + most effective is a CR Box/Corsi Rosenthal box.  So you buy a cheap box fan (30ish bucks) + a set of 4 filters (such as filtrete 1900 - around 60ish) so for under 100 bucks or so....you get a very powerful air purifier with around 400 CFM power.  Levoits are excellent and I still have two core 300s on the corners of my living room..m but 1 core 300 is not enough power. ( I now have 8 purifers for a 1 bedroom apt as I need excellent coverage since I have an old carpet I inherited here with 5x kids of mold on an test.). But my air is crisp and clean now thankfully.  So you aren't going to have excellent coverage with 1 90 dollar Core 300.  You might need 3-4 of them for excellent.  2-3 might be "good" coverage, perhaps. (Or just one of they larger units like the core 600 or Everest Air but those are around 350-390 I think)  Point is the Core 300s have 155CFM so great for a small or medium room.  For proper coverage, given allergies and such, you will need likely a lot more than that.  As general CADR numbers are based off 1 air change per hour I think. But you want 4x air changes per hour for excellent coverage.  (Every 15 mins.) So a CR box will give you around 400 CFM m, for 90ish bucks, about the same as a 350 dollar bigger Levoit unit.   So I would suggest tape together a set of filters to a box fan....while you save up if you want a bigger Levoit. But that is cheapest way to get very good coverage.  Prob 1 CR box + 1 core 300 in bedroom.  But keep adding units as needed.  Also this doesn't mention sound.  For more quiet units those are more expensive, like a 1,000 Dyson that doesn't even move much air.   Or you could get a bigger pricier unit and run it on low, to still get decent CFM.  But you won't get both high CFM, and very quiet, for the price point you mention.  Although I don't find box fans loud pet se, and my purifiers to me are quiet, all running on high.  I have gotten used to it and actually like the background noise and don't even notice it.   (As compared to when I got my first Levoit Core 300 and noticed it more.)  So you will probably just have to get used to the sound, as that can just happen naturally after a while.   But again, sound is subjective so idk exactly what is "loud" for you.   But fans are in purifiers and all fans make at least a little noise pretty much.  So it's a trade off but vastly worth it...for having better quality air.   Other good brands are Winix and Coway, also as loud/quiet (depending on ones opinion) as Levoits.  They all perform pretty close and top 3 in recent testing for both performance + decibels.   So a combination of 1 CR box + 1 affordable unit will probably get you a decent amount of base coverage.  Then add another unit/upgrade from CR Box later if needed.  (You can also still keep using the CR Box for even better coverage or even putting 1 filter behind a box fan when upright normally...can also add to coverage and save  space.) 

I missed the last part of your post about considering a 350 range unit at top end.  So the Core 600 is I think 269 on levoit.com or around 300 maybe on amazon. So I would get the best unit you can afford...and then add a CR box/other unit when you can afford another. I am not a expert in dimensions, but using the calculator on the wiki page w 1,000 feet and 8 foot ceilings, and a target goal of 4 ach (air exchanges per hour) gives I think 466 CFM needed. Now they page actually shows 4 air changes per hour on the cusp between "minimum" (3-4ach) and "good" (4-5 ach)  and it says excellent is actually 6 ach.  (You would need 733CFM for that.) So the Levoit core 600 gives like 391-430 depending on dust/smoke/dander etc.  So you would be at at least adequate protection....with just a core 600, and on the cusp of "good".  So basically in your living room, best the unit, you will have very good protection. And in a bedroom or further away room still adequate.  So that would likely be a very good unit to get to start.  And whether you want to add a CR box or a smaller purifier in bedroom for more coverage later...you can find out.  (The Core 600 + CR box gets you to 800 range CFM units running on high, so that gets you excellent. Core 600+ a core 300 in bedroom gets you almost 600 CFM, so very good coverage that way too.) Remember, a bigger unit you can lower/more units run lower, will be quieter but get you equal CFM.  So the larger unit is the best way to go by all accounts.  And just add another later if you want/need excellent etc. 

Yes, I am aware and as per Google (via IQAIr source + others)  "Yes, ozone produced by air purifiers can be harmful even at levels considered "safe" or compliant with regulations. Ozone is a toxic, reactive gas that irritates the lungs and respiratory system, causing coughing, chest pain, and worsening conditions like asthma, regardless of whether it is generated intentionally or by ionizers.  U.S. Environmental Protection Agency (.gov) U.S. Environmental Protection Agency (.gov)  +3 Why Ozone is Harmful Even at "Safe" Levels: No Truly Safe Level: Studies indicate that even small increases in ozone can cause significant respiratory discomfort, decreased lung function, and increased mortality, especially for sensitive groups like children, the elderly, and those with respiratory diseases." So yes the number is low, but it is not 0.  What is safe for "most" is not safe for every individual (and animal).  For instance I had a medical issue that is 1 in 4,000.  So even if 95% are fine...5% may not be.  (Or even 1 in a 1,000.). So why take the chance if someone has never owned an ionizing unit before ?  The bare minimum for a first time unit...is to at least have an on/off ability which blue air just does not have.  It might be a fine choice for even most people, but it won't be a good choice for everyone.  It's a risk for a first timer as they just wont know how they react to it.  As well consider that people might have multiple units running....and these tests are only done on 1 unit.  So if you have like 3,4,5 units all employing even a "safe" level of ozone...then you may be then getting above a safe level at that point.  As you will then be getting 3,4,5x as much ozone dose if you have multiple units running. It. As well the size of space also matters, as in one study they put a unit in a small bathroom...a unit which has the "safe" ozone levels under 50ppm or whichever metric...and even that created over the threshold to an unsafe level and what would be a level 2 safety smog alert.  (Not how the unit is intended to be used they acknowledge, but undoubtedly some people will be running too big or too many units ..and getting to possibly unsafe levels..even if each unit individually is tested "safe".) As well some say that no amount of ozone indoors is safe to breathe. (As IQAir seems to be saying and that "safe" level keeps going down further and further...so we really don't know what is truly safe, and certainly safe for most...is not safe for every person.). Especially for their first unit.  It's just a flaw with BlueAir even if their units are good quality.   "Underwriters Laboratory’s UL Standard 867 requires household air purifiers to produce no more than 50 parts per billion (ppb) of ozone. However, even this level is not safe for humans to breathe." https://www.iqair.com/newsroom/are-you-polluting-your-home-ozone Note: I use a different brand one with ionizer, but I toggle it off sometimes. I like the function, so that works for me. But for a first time buyer...it must have toggle on/off otherwise it's a risk that they may not like the unit, or maybe even detrimental to thier health/animals etc.  

Get the Levoit Core 600, its on sale on amazon for 250 right now. It has 390 CFM power, the Core 300 only has 145. Meaning its more than twice as powerful. That would give you excellent air quality, with almost 8 air changes per hour (what I have, and I had to get excellent coverage as I had bad allergies as well, and an old smelly carpet etc.) 6 Air changes (ACH) is excellent, 4 or 4.8 is good. The Core 300 is a great unit although that is rated for 1,073 feet. Meaning it would give you about 2.5 air changes per hour in 400 sq. feet. Which is just a minimum of coverage, and not even "good". so for those with allergies and/or bad air conditions...you will likely want excellent. Which is more like 2,000 or 3,000 feet of coverage, so bigger units than what you are looking at. But you dont need an expensive woozoo fan imo. Just get a better purifier. You can get a 30 dollar box fan which will move more air than the woozoo. You can also even tape merv 13+ filters around a box fan...and create a DIY purifier that does 400range CFM power. Lastly, you can even put 1 merv 13 filter in front of/behind a powerful (but cheap) box fan...and get around 150 CFM, or about the same CFM power as the purifiers you are looking at. So get a Levoit Core 600 + a box fan if you want. (if you want ionizer you can also get a 600 plasma pro for 50 bucks more I think,but you dont need ionizer.) Main thing is Hepa with most CFM power, that is what will capture particulates. Ionizer is a nice to have, I use one on one of my 8 units, but not at all neccessity. (You could also add the core 300 with ionizer or other inoizing unit later. right now...id suggest the Core 600. (They also have some carbon pellets in filters, to help with smoke/odors, and the bigger unit will have more of that.) Although the best units for VOCS/odors are very expensive like 750 for Austin Air or 1,000 for IQ Air. Alen also decent but not nearly as good as Austin Air/IQ Air, but would be a litlte better for VOC's. But again...meain thing is CFM power for capturing particulates. For ktichen smells thats where the fan comes in + use hood range, + bathroom exhaust fan, open windows etc. to ventilate. A Levoit will help a little on that but ventilation key there. And the Levoit 600 will be excellent for your allergies and getting rid of particulates. The Core 300 and the other units you are looking at aren't large enough to get you excellent air quality. (just minimum coverage, which is often not enough for those of us with allergies.) Winix also has good units at the slightly higher price point that would provide the adeqaute size. I would avoid blue air as you cannot toggle the ionizer of on those. (in case you have issue with it, as some people get respiratory disrress, sortof how hiking at elevation makes some people want to cough...despite the air also being more clean. Everyone will have a different threshold on that, so best if you can toggle on/off esp for first time buyer imo.) Sharks are not as good as those other brands, and just OK. (The Levoit Core 300 beat the Shark in recent testing, depsite the Shark costing more, they have a sortof "never replace the filter" schtick (or whatever it is), but they dont clean the air as well as the better units like Winix, Levoit, and Coway.

Unfortunately I believe the AirDoctors also have an ionizer that can be toggled on/off.   (According to Google search, and the panel I see.). So given the risk of even accidentally turning it on....(And forgetting/not knowing to turn it off...) id also consider avoiding this unit for your particular case.  Although otherwise they seem like good units imo.   Levoits are good units that don't have ionizers (save for their "plasma pro" line.). The Alen Flex line does not have them, and perhaps some Winnix/Coway units might not have them, but I am unsure of which.  Winnix will still work well without the ionizer, you just have to make sure you can easily tell if it's on/off,and i don't have one so idk how that goes.  When it says 630 sq ft 4x an hour on a device rated for like 2,500 sq feet then yea.  They already did the calculation for you so it's going to be good for 630 sq ft.  As opposed to the 2,500 or whatever would give it only 1 air change per hour.  Maybe you can ask your Vet if the ionizer harmful ?  But short of knowing for sure best would be fair to avoid a unit that has it, which would still be Air Doctor.  But look at the control panel and see if you think you could be confident in not toggling it on/off.  (Same for Winnix, those are great if you can handle not toggling the ionizer, th Air Doctor is prob also using the ionizer on its it's calculations, but I don't think it makes a big difference on CADR.  They do help a little though, but particles will fall to the floor so you don't breathe them in.  However particles still present + need to be vacuumed up. I run an ionizer on a brand where I can toggle it on/off.  It helps. But when I lay on my floor my floor is very dusty also...) So it's up to you how safe you feel with a unit you can toggle on/off but lots of units without ionizer, so id just look to one of those.  CR Boxes also great here as they give 400CFM power, with ofc no ionizer.  But otherwise I would look at bigger Levoit units like the Core 600 or Everest Air.  (Everest has similar CFM to the Core 600, but you pay more for a fancier air quality monitor, so Levoit core 600 is a great unit that has even slightly better coverage than the air Doctor (2,933 total to Air Doctor 2520, meaning the Levoit Core 600 will give you 4x hour in about 700 sq.ft. size.)  The Everest might have a slightly better filter too, but is pricier for around the same CFM power.  Winnix + Air Doctor likely great units too...but you gotta consider the toggle on/off thing.  

Yea, I wouldnt worry about tht true hepa thing.  Almost every brand in the market had been found to not be "true Hepa" if you manipulate in enough various scenarios.  Such as most units will pass Hepa 13 99.7% on low settings...but just turning it to high . Will then make the save unit not pass the threshold.  If it is a good brand it might be off by a fraction, do 99.5% instead of 99.7%.  it doesn't make much difference.  It will still clean the air well, as we see Levoits perform very well in recent tests.  It's more a technical thing, and a marketing thing with the better industry.  As top brands like Winix have also been sued for the same thing, as well as Alen, and many others.  Coway as well had not been sued yet ..but found to have the same issue, "not true Hepa" on some settings.  So they are trying to change their marketing...before getting sued. So If it is True Hepa on some settings, and not in others (by a fraction). Is it true Hepa ?  It be one a semantical argument.  But lawyers can make some money since they can technically prove it doesn't reach in black scenario.  As well Dyson was found to bring the suit against Levoit apparently...and the Levoits were found to clean more air per dollar spent than the Dysons themselves.   The only units that might meet that on all settings are the 1,000 Dysons or maybe IQAir.  The Dysons move are so slow...that they don't move fast enough to have that problem.  (They are known for being quiet and looking cool, but they don't move much air, and especially not for the price you pay.).  In recent testing all the top performing units have either been sued or had the same issue found...so it's more a marketing issue.  And not much of a difference to the user, if it's only off by a fraction...as it is with these good brands that we see lead on testing.  Heres some threads on the topic, and a YouTube video where they test all the units...2 of the units sued performed the best in the test...as it's not very important, and a technicality basically.  https://www.classaction.org/news/winix-lawsuit-alleges-air-purifiers-fall-short-of-advertised-hepa-protection-standards https://www.reddit.com/r/AirPurifiers/comments/1sh8696/are_coway_filters_not_hepa_on_all_speeds/ https://www.reddit.com/r/HouseFresh/comments/1s124ux/coway_purifiers_no_longer_true_hepa_or_green_true/ At around the 20:27 mark he shows the chart with the results...and picks the Levoits as one of the best.  They clean the air very well.  Excellent units, as I still have two of them in my living room going near continuously for 5+6 years now.... https://www.youtube.com/watch?v=sQGfO4hNb60

Very interesting.  Although it's not "no ozone" but under 5 ppb to meet that threshold.  So it likely releasing some, and is definitely generating a lot more ( in a chamber.). The thing, if there is even a slight problem with the unit, there could be leakage, so it's not worth the risk imo.  This response on a thread about it sums it up pretty well imo, and has a good link where they actually take the unit apart.   https://www.reddit.com/r/AirPurifiers/comments/we00oy/comment/j0mvtpw/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button This article might be exaggerating a little, as it's from a competitor (it even knocks Levoit, essentially hinting that they all have ionizers, which is ofc, not true.). However if a thing is generating a lot of ozone right near me, and that only thing stopping it from escaping is some tiny plastic in a low priced consumer item...I am not going to take the chance as sometimes purifiers break or don't work as intended.  (As the article talks about Sharper Image and Iconic Breeze etc.  Which went out of business.)  Blue Airs are good units.  But they definitely do produce ozone, however in a properly functioning unit (of that type) most units hopefully won't release most of it.  Also if you have it for a long time the chance of failure or something degrading increases so I would just avoid in your case.  But they are a decent brand imo.   https://smartairfilters.com/en/blog/blueair-air-purifiers-review-ionizer-ozone/

Yea, I would also say simple CR Boxes would probably help you a lot too (and your bunny) as it's just a 30 dollar box fan + 60 bucks for set of filtrete 1900 filters.  So 90 bucks for 400 CFM power.  About the same as a 300-400 dollar air purifier.  So it sounds like you could use a bunch of them.  But get 1-2 good units, with air quality monitor, filter replacement reminders etc. and maybe make 1-2 CR boxes as well, of you don't mind tht aesthetics...as you need excellent coverage it sounds like.  (I have 8x units in a large 1 bdrm apartment with old smelly carpets and some mold I inherited.  So even 2 good units did not solve my problem but I needed like 5 or 6 to get to comfortable, and 8 for for perfectly crisp + clean air.).  So add CR boxes too if needed and see if  you can get your bunnies snuggles to stop...Aldo Judy box fans can help more air around and help the efficiency of the purifiers.  But box fans with filters behind/in front/ or even takes sound them...all help exceptionally well too.  (Good merv 13+ filters, filtrete 1900 is one etc.) Purifiers will help you a lot....

Hmm, your right - that is pretty confusing.  I thought the S meant smart, but I didn't know what the P was. (I still don't, maybe "plus" ? But It might not mean anything really.) As there seems to just be s-p units and they don't have plasma.  (Plasma  One might officially be labeled s-p also but the all say plasma in the heading for those). One way to tell is the plasma ones have a little leaf button with +/- next to the leaf.  That's the Ionization button.  No normal s-p/or any normal units have that button on the top.  Only the plasma pro ones that specifically say that. (From what I just Iooked at.).  So the s-p should be fine. (Some I see 600S on an article but maybe that was an older version, or they were just using shorthand.) Bottomline seems you are corect that s-p is fine, googles AI is wrong, and I've only seen the ionization button on units labeled "plasma pro", as expected.  (My Core 300 units just say that,.no s, p, or anything so I think with newer units they have added the letters for whatever reason.)   

Pretty much every brand is not HEPA in that regard, as it's a problem in the industry with most units seemingly meeting the threshold on low, but not on a higher setting for instance.  So multiple top brands have all been sued for the same technicality like Winix, Levoit, Alen etc etc. And Coway hasn't been sued yet but was found to have the same problem.  That's pretty much a majority of the top selling brands all having the same issue, as it's more a technicality, not a problem for the user.  As in if it does 99.6% instead of 99.7% on high for instance you are still getting very clean air.  If it's off by a fraction...it is ultimately unimportant.  As we know Levoits clean the air very well based on recent testing.  All of the top 3 brands in recent testing...all have either been sued or been found to have the same issue.  So its ultimately not very important to the user, and more a marketing issue within the whole industry.  The only brand that might pass on all is Dyson, as their units are known for being quiet but slower.  So they don't even move the air fast enough to have that problem...so the Levoit actually cleaned more air per dollar spent...than the Dyson itself.  (If you have 99.6,% but at more power you will clean more air than 99.7% at lower power.).  The difference is like one dozen  particles out of 10,000.  You will still have very clean air with a Levoit, Winix, or Coway, often times...even more so than with something that officially meets the HEPA 13 standard.  So I wouldn't worry about that.  Levoits are excellent at cleaning the air of particles.  Here is recent testing proving it, and the guy even chose Levoit as the best performing units of its size, (with the top units being Winix, Levoit, Coway, and Dyson.)  So do not worry about the HEPA 13 thing, as when it's a good brand off by a fraction....it is still complete fine, and very well may be outperforming the slower H13 unit.  (The Remaining dozen or so particles will get picked up on the 2nd pass, so no big deal.  But good marketing attempts by Dyson to try to paint other brands as worse or inferior etc.)  https://youtu.be/sQGfO4hNb60?si=PBIDWaqVZUkP1uX7 I think at around the 20:54 mark he shows the results with the chart.   As to your Q I think you are saying you want to spend under 130 per unit ?  And you will need to spend a bit more than that but Levoits are a very affordable, but great value for that you get. So the Vital 200s is 160ish, so that will be good for a bedroom/normal sized room. Bur for a living room, and given all the pets, you will probably want the Core 600, which is a whopping 390CFM for 250ish.   Another budget friendly idea is CR Boxes/Corsi Rosenthal boxes ..which can get you 400 range CFM...for only 90ish bucks or so.  As it's a DIY purifier with a 30 dollar box fan...and a set of 4 merv 13 filters taped around it into a cube/square.  That gets you more CFM power than any purifier under 400ish bucks or so.  (Even more than some that are 1,000 dollars.)  So if budget an issue you could get a Vital 200s in living room + pair with a CR Box in living room which would get you a huge 650 CFM on high.  (Compared to 390 from the Core 600 itself.). But idk how big your space is so that would be needed to better judge what sizes you need.  But CR boxes at 400 CFM can cover pretty much any room very well.   So something like a Core 600 in living room (or CR Box) , a Vital 200 in bedroom, and a CR box in office, something like that would likely get you excellent coverage at a good price.  You don't really need one in a bathroom, and it's not a great place for them as you can't get them wet.  (But OK if you can keep it from getting wet, in which case a small 50 dollar one is OK, like a Levoit Mini, but again, I don't think needed imo, if you have proper coverage elsewhere.)  

Virtually all the brands are getting sued so none of them have true hepa, on some technicality.  (They are hepa standard on low, but sometimes just under the threshold on high for instance.). So pretty much every brand has this problem, but it's ultimately not that important if it's a fraction off like with that good brands.   Maybe Dyson or IQ Air but they are like 1,000 dollars.  (And Dyson doesn't even move much air.).  Pretty much every unit under 400 dollars will have the hepa technicality, but they are still very good units, they filter air very well.  So the best brands in that price range are Winix, Levoit, and Coway.  All perform top 3 in recent testing.  Although Winix + Coway might have ionizers.  So Levoit would be your best choice for simple + effective.  But their pricier units do have an air quality monitor and smart features.  (Only their Plasma Pro line has ionizers, all other Levoits by default, do not have ionizer.) So i would suggest the Levoit Core 600 for 280ish..and then build some corsi rosnethal boxes too...as for best coverage you want 4-6 air changes per hour.  Not just 1.  (All CADR recs are usually based on just 1 air change per hour.).  So realistically you will want multiple units, 1 in each room ideal.  But esp 1 in bedroom + one in central location, at minimum.   There is also the Levoit Everest Air for 400 or 500, but you are then mostly paying more for a fancier air quality monitor.  The Core 600 is about as powerful as the Everest Air.  But a Corsi Rosenthal Box is as powerful as either of them...for a fraction of the cost too.  (As powerful as every purifier under 300-400 bucks pretty much.)  If you don't mind a unit where you can toggle ionizer on/off you can look at Winix or Coway, but on some you might not be able to turn off, so you would need to look closely.  But those are good brands as well. (Although Coway also uses an anti-microbial fungicide/pesticide at trace levels on thier filters so some may not like that. In safe level like 0.000047 etc.)  All 3 of those brands have been sued or found to not be "true hepa" and they are the top 3 brands..so i wouldnt worry about that (if you were.). As recent testing shows they all filter the air very well...finishing in the top 3 in testing. And the cheapest/perhaps best way for effective CFM power is via Corsi Rosnethal boxes.  So some combination I think best. 

They aren't bad in moderation/most of the time when used properly.   I have it running on 1 of my 8 units, but I can toggle it on/off.  If someone is running like 5x units with ionizer at once...then you are getting 5x the ozone level, which could become problematic.  And some people are just vulnerable to respiratory distress from any level of ozone, even technically a safe level.  (Ozone is less oxygen in air so the air is thinner, thus why people climbing mount Everest are always coughing.). The air is very crisp + clean though, as less particles in the air.  (They get heavy and drop lower.  Thus is a little ozone you can have particles drop to floor so you aren't breathing them for better air.  But you will still need to vacuum them off the floor at some point too.  But it does help with air quality, if a small amount.).  But older people, vulnerable people, people with allergies or respiratory problems...might all find respiratory issue from even a tiny change in ozone.  As well as pets, as it's harmful to birds for instance.  But most people should be fine with the tiny/safe amount emitted from most purifiers.   It helps clean my air.  But moderation is key and first time users should be careful and only get a unit that can toggle on/off in case they don't like it.   As well too big a unit In a small space without ventilation can increase the ozone level to a possibly problematic amount, and other various issues.  But they are generally fine if you just have it on 1 unit, in a sizable enough space.  

As someone else said, Levoit is probably the best  brand of those you mentioned.  Pure Enrichment is also good imo.  Germ Guardian is maybe OK.  So id get a Levoit of those choices.  (I'm not famIliar with Crane, Honeywell also prob just OK.)  So I would measure how much space you have under your desk area (if it's going there) or otherwise just get the biggest unit you can.  Meaning most CFM coverage really. So a Levoit Core 600 would be a very good choice.  They have some carbon pellets in filter, which can help with smoke/odors.   You can also get an additional little hand held one that you can prop next to you (Pure Enrichment has cupsize holder ones for 40 bucks I think.)  if you want additional, but that will do only a tiny little bit, compares to a a big unit.  So a big unit would be doing like 90% of the work.  ( A Levoit Core 600 has 390 CFM, a pure Enrichment Mini has...4.  so those are nice to carry around but they don't do a lot unless pointed right at your face really and still a big unit next to you will do like 100x more.)  So on the staples site they have a Levoit 600 Plasma Pro, that would be a great choice.  However you probably would want to keep the plasma (ionization) toggled off, as some people find respiratory distress from an ionizer.   So just get the regular Levoit Core 600 (maybe thats on Office Depot, but the plasma pro is fine but make sure no one has health issue regarding ionization.  Essentially ionization makes particles bind together so they fall to floor and you don't breathe them in.  So similar to air at elevation....which is often crisp + clean.  However some people will find they want to cough as more ozone.  All commercial air purifiers only emit a tiny safe amount + are certified, however elderly people + some vulnerable might still find a little threat irritation with ionization turned on.  However given how large of an office space you have, I doubt anyone would notice.  (Maybe only you, if you happened to have issue, so in that case just toggle it off.). It's more an issue if a big unit in an enclosed space but I think with cubicle you have open air, so the amount of ozone would be so diluted that doubt anyone would notice, but best to keep that in mind for others sake.  Ionization isn't needed anyway.  The main thing. Is just the HEPA filtration that the Levoit Core 600 will provide, as that's a strong unit and white Hepa will capture particles so you don't breathe them in.  So the more powerful unit...will move the most air + capture the most particles the quickest.  Ionization can just help a bit, but not needed. ( I have it on, on my main unit and can toggle off if needed.)  On Staples the Turonoc ? Big unit looks decent, however I've never heard of Turonuc but if it breaks + your company is covering then I guess it doesn't matter. (Random brands have higher chance of breaking/having issue within a year or so.)   So as Levoit is a great brand so id go with th Core 600 first, by a mile.  ( I have two Levoits running newer continuously for 5+6 years now...)  The Pure Enrichment Elite is a good unit too, that I have as well.  The UVC can help a little (not much though as it might take many passes to inactivate some virus particles which could take hours in such a large space - the UVC in purifier units isn't strong enough + does not have enough dwell time to actively kill most virus particles. However, like ionization,  it could help a tiny bit if you are near it maybe, but it's not a reason to get that over a Levoit Core 600). It can also be toggled on/off too. So only  if space were an issue would I consider the Pure Enrichment Elite as I think it might fit under a desk.  But it's not nearly as powerful as a Levoit Core 600, I think 120ish CFM...to 390 for the Core 600. So like 3x weaker.  So get the biggest + best unit you can get.  Will have much better impact for you.  

You need a larger size unit than those, for excellent air quality.  For 10ish bucks more you can get tht Levoit Vital 200s.  I would suggest that as the minimum size for your space.  (Rated for 1,800 feet.)  Since allergies you will want excellent coverage...not just the minimum, which is what those smaller units would be.  Winix is a great brand, but same thing you would like need a size up and they sell units at same sizes + price points as Levoit so they also have a good unit rated for around 1,800 feet.  So your sg footage is about 252 with estimating the middle of 10-12 ft cielings (11ft i put).  For 4.8 air changes (good air quality) you need 221CFM.  For excellent (6ach) you need 277.  A Levoit Vital 200s does 250CFM and is rated for 1,800ish feet. Meaning it will change the air in a 252sq. Ft space about 6-7 times which is excellent ( while on high though.  On medium will be half that, and low mode about 1/3 or 1/4.). So the Vital 200sp or any Winix rated for around the same 1,800ish feet ..would be the minimum I would recommend, for the unit to give you excellent/newer excellent air quality when running on high.  Those smaller units would be struggling get you to "good", even on high.  And would be far below that not on high.   You may even want to consider even bigger such as a Levoit Core 600 which does 390CFM for around 250-280 dollars.  Or get one that size for your living room later.  (3,000 ft coverage.). But get units rated for at least 1,800 or so for that bedroom.  Winix or Levoit both great, but you need one size up for good to excellent coverage. 

IQ Air is one of the best as the Health Pro Plus Xe I think does a good 300ish CFM while also having I think 15 pounds carbon pellets + related to absorb odors/VOCs/smoke etc. Although if your allergies are purely particulate based you can get 400CFM of particulate coverage for like 90 bucks with a DIY CR box /Corsi Rosnethal box.  (A 30 dollar box fan taped to a set of 4 merv 13+ filters is as much or more particulate coverage than you will get from any 300-400 dollar air purifier pretty much.)  So you don't need to spend 1,000 dollars on a unit to get good air.  If smoke/odors/gasses and allergies related to those issues then definitely IQ Air.  And it's one of the best units anyway.   But for physical allergens many units do very well, units from Winix, Levoit and Coway all perform really well and close to each other.  In particulate coverage.  So I like Levoit as they are simple and effective and good value for what you get.  So a Levoit core 600 is a powerful unit with 390 or so CFM for 280 bucks or so.  Has air quality monitor as well.  If you want an ionizer you can get the plasma pro version, but be careful as ionizers can cause respiratory distress in some.  So some Winix + Coway units have ionizer that can be toggled on/off but you have to look closely.  As well Coway uses an antibacterial fungicide on their filters in low/safe levels but if you have allergies relating to that then I'd go Levoit or Winix,  but they are also good units otherwise. Dyson are known for being very quiet and have good air sensors but they don't move much air.  I think it moves as much as the Levoit 200 you already have...but it costs like 800 dollars more.  So not really worth the cost if you just want the best particulate coverage.  Alen is a good brand too that is kind of good at both particulate and VOCs, with their best filter.  And they have a lifetime warranty if you stay in filter replacement program.  Austin Air are also 2nd best for VOCs,  but don't move much air in terms of particulate coverage.  I think it's a good idea to have a unit good vs VOCs even if it's not your top priority so maybe an Alen 45i or 75i + a Levoit Core 600 or similar priced Winix.  Alens are also quieter, but don't move as much air as Levoit/Winix/Coway.  As slowly air flow is better at absorbing VOCs/gasses with the carbon pellets.  Levoit has some in their filters but not nearly as much as those other units more tailored for VOCs, so a Levoit can still help a little in that regard likewise Winix + Coway also I think.  But Alens are a little better for VOCs a little quieter and a little slower, but still decent at CFM speed.  IQ AIr best units also good at both and better than the Alen by a lot.  Austin Air very good VOC, kinda slow for particulates.   So again, depends what types.of allergies/needs.  But for just particulates, with a little help on VOCs...Levoit, Winix, Coway all pretty great.  Or even a CR Box which at 90 bucks and 400 CFM rivals or outdoes must about any unit for particulate coverage.  Even 1 box fan with a merv 13 filter in front/behind it..can do about 150 CFM...pretty close to what the vital 200 does.  As box fans are big,.cheap, energy efficient...and move a lot of air.  That's essentially all most purifiers are.  A filter + a smallish fan to move the air around.  You pay more for air quality sensors, filter replacement reminders, apps and various others features.    But lots of units can capture particulates every well,.even 90 dollar CR Boxes + related.  So something like a Levoit Core 600/Levoit Everest Air/Winix + a unit for VOCs like Alen might make sense.  (Alens are sortof thin so a hallway might work.)  Or get the IQ AIR if you have the money to spend.. but you will still want another unit too for total CFM coverage.  Lots of options...so what features are most important to you ?    Another really thin unit is Rabbit Air, as you can even hang them on a wall...however they also don't move much air.  Maybe if you put two, on one each wall, but that's pricey as they are a bit Dyson-esque in paying like 250 bucks or so for only I think 113CFM. So two of them would be around 500 bucks for only 226 CFM...so definitely not good value.  But space wise can be useful in some instances perhaps.  

Ok, so...a unit breaking after 2 years is not the same as programming a unit to break after 2 years ?   I review units and have tried numerous poor quality/random brands.  I've had many random brands break within 6 months - 1 year ish.  It is industry standard to only have a 1 year warranty also.  I have not had any such problem withy Levoits.  While other units have broken and had issues, my Levoits are still going perfectly strong, for 5+6 years now....so your experience does not seem to match up with other people's experience and consumers in general.  (I just looked at the reviews and the core 600 has a near perfect 4.9 rating and even looking at the only 4% who gave it 1% star, not a single one of the recent reviews said their unit broke in 2 years.  1 person...had it break after nearly 3 years though.)

Yes, so Levoits are an excellent brand that do not have ionizers by default. (Only their "plasma pro" line has ionizers, all others do not.).  So as someone else said the Core line is excellent, so there is the Core 600,400, and 300 and another good one, with square design is the Vital 200s.  So some combination of those units.  Do smart features and app control matter to you ?  As some of their units will have an "s" for smart,  but the not smart version are the same just without the smart features, for about 50 dollars cheaper.  So keep that in mind. So for main space Levoit Core 600 does 390CFM for 280 bucks, an excellent value there.  Smart features, air quality monitor etc.  Great for main unit.  (My Amazon says it's currently on sale for 250 too)   That is rated for about 3,000 feet so it will give 4 air changes per hour in a space of 750sq feet.  (3,000 divided by 4).   So on max it will give you good air quality of 4ach.  If later you decide you want excellent air coverage (6ach, or every 10 minutes instead of every 15 minutes which is 4 ach) then you can always add a 90 dollar Core 300 which is small but powerful to give extra coverage.  For your budget + basic needs...the Core 600s will be a very good choice imo. (If you had bad allergies and/or very bad air you might want the excellent, but start with that and see how it goes, will make a huge difference either way.) For your biggest bedroom you could get either a Levoit Vitals or the Core 400.  They are both around the same price + power.  (Within 5:10% or so on both.) Just one is circular, one is rectangle, and the rectangle maybe has a little more filter area.  I think 20 bucks cheaper.  The Core one might have a better air quality monitor ?   Bur Vital has air quality monitor also.  Both will give excellent coverage, so pick whicher fits your space better, design wise + aesthetics.   Maybe 1 in 1 bedroom and 1 in the other.   For smallest/least important room you can put a 90 dollar Core 300 in there.   It's rated for 1,000ish feet so 4 air changes/good air quality in a 250 sq. Foot space. (So fine in a bedroom, however you have to run it on high for that number so the bigger units you can run on medium, which is quieter and still get more CFM, so go with the medium/bigger units in bedroom and Core 300s great for smaller/medium rooms, and for additional coverage.). So great for your last room.   I think 1 Core 600s, 1 Core 400s, 1 Vital 200s, and 1 Core 300 = about 680-750 so right in your budget.  Enjoy...

Get the Levoit Core 600, its on sale on amazon for 250 right now. It has 390 CFM power, the Core 300 only has 145. Meaning its more than twice as powerful. That would give you excellent air quality, with almost 8 air changes per hour (what I have, and I had to get excellent coverage as I had bad allergies as well, and an old smelly carpet etc.) 6 Air changes (ACH) is excellent, 4 or 4.8 is good. The Core 300 is a great unit although that is rated for 1,073 feet. Meaning it would give you about 2.5 air changes per hour in 400 sq. feet. Which is just a minimum of coverage, and not even "good". so for those with allergies and/or bad air conditions...you will likely want excellent. Which is more like 2,000 or 3,000 feet of coverage, so bigger units than what you are looking at. But you dont need an expensive woozoo fan imo. Just get a better purifier. You can get a 30 dollar box fan which will move more air than the woozoo. You can also even tape merv 13+ filters around a box fan...and create a DIY purifier that does 400range CFM power. Lastly, you can even put 1 merv 13 filter in front of/behind a powerful (but cheap) box fan...and get around 150 CFM, or about the same CFM power as the purifiers you are looking at. So get a Levoit Core 600 + a box fan if you want. (if you want ionizer you can also get a 600 plasma pro for 50 bucks more I think,but you dont need ionizer.) Main thing is Hepa with most CFM power, that is what will capture particulates. Ionizer is a nice to have, I use one on one of my 8 units, but not at all neccessity. (You could also add the core 300 with ionizer or other inoizing unit later. right now...id suggest the Core 600. (They also have some carbon pellets in filters, to help with smoke/odors, and the bigger unit will have more of that.) Although the best units for VOCS/odors are very expensive like 750 for Austin Air or 1,000 for IQ Air. Alen also decent but not nearly as good as Austin Air/IQ Air, but would be a litlte better for VOC's. But again...meain thing is CFM power for capturing particulates. For ktichen smells thats where the fan comes in + use hood range, + bathroom exhaust fan, open windows etc. to ventilate. A Levoit will help a little on that but ventilation key there. And the Levoit 600 will be excellent for your allergies and getting rid of particulates. The Core 300 and the other units you are looking at aren't large enough to get you excellent air quality. (just minimum coverage, which is often not enough for those of us with allergies.) Winix also has good units at the slightly higher price point that would provide the adeqaute size. I would avoid blue air as you cannot toggle the ionizer of on those. (in case you have issue with it, as some people get respiratory disrress, sortof how hiking at elevation makes some people want to cough...despite the air also being more clean. Everyone will have a different threshold on that, so best if you can toggle on/off esp for first time buyer imo.) Sharks are not as good as those other brands, and just OK. (The Levoit Core 300 beat the Shark in recent testing, depsite the Shark costing more, they have a sortof "never replace the filter" schtick (or whatever it is), but they dont clean the air as well as the better units like Winix, Levoit, and Coway.

So the Everest Air also has a washable pre-filter (only Levoit with that believe) which helps the main filter last longer, apparently 12-15 months, compared to normal 6-9 months in Core 600.   As well I think it's a heavier,.bigger filter (can't find the weights) which means it likely has more carbon material so will last longer + be better on odors/smoke VOCs. It's also apparently slightly quieter too.  So idk if thats worth paying 200ish more for, for around the same CFM power (as well as aesthetics which you mentioned was an important factor.) but if they like that unit, you are getting various perks for the money.  (Especially with the better air quality sensor too, but other valuable  besides that.) So if you consider filter savings cost...from the longer lasting filter...perhaps it end up reflecting that cost difference.  (Evening out, or even saving money if you have it a long time perhaps.)   So the Everest 100/70 subscription at even 12 months is cheaper per year than having to get 2x Core 600 filters (every 6 months) at 60/42 each so 120/84 per 12 months.   So you could end up saving around 20 bucks a year, after 5 years that's 100 bucks.  If you have the unit for 10+ years you would end up saving money.   If you like the unit, I would just get it.  Only reason not to would be perhaps if the space is so large that a core 600 would be already at the max coverage area.  (The Everest Air 354 vs 390 on high). That's about all the Core 600s has on it, besides the lower price.  Both are great units.  If money an issue you could also get two Vital 200s which will give even more CFM than both, at 500CFM on high. (Or for same money can get 1 core 600s + 1 Vital 200 for bedroom for instance.).  But the Everest Air has the washable pre-filter filter,longer lasting filters for potential filter savings, better sensors for better air quality data etc.  As well as the stated aesthetics, which are rather important in a living room imo. I'd say it's an easy choice if you have the budget. 

I don't know, as I don't own that unit, but I have multiple other Levoit units.  I also don't use the smart functions as I have "non-smart" units so I couldnt really say.   Generally it's pretty easy to set up purifiers (at least with my Alexa.).  They have photos on the product page on the site showing how the app looks. It looks good and like how the app is with a different brand unit I have.  I'm not quite sure what specific question you have, but I would watch some reviews on YouTube about it.  So on that unit I have I can change the settings immediately, it's easy.  People say the IOS is excellent in the reviews I just looked at.  All the smart units I have are smooth responsive, easy, immediate etc.  But if you aren't sure...just buy a cheaper Smart Levoit and you can see what smart functions are like.  You don't need to buy this unit for smart functions.  Most Levoit units have smart versions available. This just has more readings + data.   If you want a really good air sensor ..you can probably get better with a seperate unit, such as Purple Air, AirThings etc.  (I don't own them, but cheaper ones that have been fine for me.). Most air purifier sensors are just so-so and generally buying an air quality monitor separately will be more accurate.  So a I would imagine a 300 dollar separate air sensor will very likely be better than the sensor on this unit, as most of the cost is on the unit as a purifier.  It might be 100 bucks ? Dedicated to the sensor.   As well it apparently gives 4 readings, (I think ?) whereas a separate unit might give like 8 readings.  The better sensor is not the main reason why I would buy this unit.  Most air purifier sensors, even on a 500 dollar unit, are not super-accurate.  So it's almost always better to get a separate sensor if you want the best air quality readings.  (And even a 300 dollar sensor might be slightly off, perhaps.).   But from the app photos it shows it giving real time numbers, with multiple PM particle readings, which is more readings than I have on my other brand 400 dollar purifier.  That just has PM2.5.  Which is still pretty useful and I get the other numbers from some cheap air monitors.  While The Everest Air has 3+ more.  But you can get all those readings with a seperate monitor.  It's a nice thing to have, but not a necessity imo, and definitely not the sole reason to get this unit imo.  (Get it if you like the washable pre-filter, longer filter life etc.  And need a unit that size.) 

An affordable and long lasting one is Alen 45i, around 300-400 bucks and they have a lifetime warranty. (if you stay signd up with the filter replacement plan, with one every 9 or 12 months, your choice.) It has black carbon filter material, and is good overall, would be very good for a 300 sq foot area. Levoits are great for lonevity as I've had mine running continuously for 5 years...still going...most other affordable brands will break or have problems but the Levoits last forever. However, they dont have a huge amoount of carbon, only a litlte in some of the filters I think. If you can afford a lot consider the pricey units others are suggesting. I cant afford that and use a combination of levoits + an Alen + RIA Breezeguard (my best unit overall with carbon fiber layer + UVC + humidifier all built in, however it doesn't have a lifetime warranty but so far its been great after a few years. Around 400 I think. The RIA Breezeguard is bigger + pushes more air and has more options (also app/phone control.) But you prob wont need that so much in a small studio apartment. So if you want longevity/lifetime warranty and good effectiveness for the area you have...the Alen 45i is a good choice imo. If you had a bedroom then add a levoit in there for more coverage etc. The only downside to my Alen 45i is that it doesn't super forecefully move air on high, it just kind of goes pretty steady....but it lasts forever and for your small space, if placed in a decent spot where air is flowing...then would still be very good for now + long term. Add in more units once you move to a bigger space. You can also just buy some black carbon filters (for any brand really) and place a few around if you want to capture more odors, esp smoke. So Ria BreatheSmart great all-around unit with excellent features, good carbon, but unsure about longevity Alen 45i seems to meet all your needs with longevity, carbon, size etc. Levoits awesome for longevity as well (not lifetime warranty but they last a long time) but just so-so on carbon I think. (Don't know thier newer/more pricey models as my 2 100 dollars ones have lasted years....) Ofc I like all 3 brands and use all 3 in my bigger space (+ more in bedroom etc.)

I like Levoits myself, as well as Alen.  I've never had a Coway but people seem to like them too, and they likely perform well.  Dyson I think seems over priced for the performance you get, but it may have some other bells and whistles.  (The fan power on a Dyson for instance wasn't very strong in a comparison I saw, but yet they prob cost the most.  Maybe paying for aesthetics + brand name as well.)    Doesnt mean it's bad, just probably not the best value for what you get.   I also really like my RIA Breezeguard, as that's my current favorite unit I have.  (Don't know longevity yet though as it's maybe a newer brand and Ive had it 2.5 years vs 6+ for Levoits and Alen units usually have a lifetime warranty.)  If I was looking to get another unit I would definitely consider Coway, and if I could afford a Dyson I would consider that too.  But Levoits are affordable, reliable + last years.   Alens same idea but little pricier with lifetime warranty, and built to run continuously. (With yearly filter subscription enrolled.)  So no I don't think there is a consensus ?   As others are saying DIY it which gives good value for the CFM performance you get too. (but has some drawbacks as well.).  For instance I am disabled so I can't be messing with a unit if it has a problem, or putting stuff together, and I don't have the funds to buy a replacement if it breaks.  So I need something preferably  affordable, easy to use, reliable, and with excellent longevity/warranty.   So that's Levoit + Alen.  Other people will have other needs/preferences.  A lot of the well regarded brands units perform decently well, and have various small differences so it comes down to preference a lot. Just avoid random/new/cheap brands as those are the ones I've had break down and have the most problems.   

I keep two levoits in the corners of my living room,  but i also have an Alen in a more central location along a wall where a lot of air passes through.  But Levoits shoot the air upwards and are circular, so they sort of can work in a corner - but you still should have I believe 12 inches of space or so officially. (Mine are maybe 6 inches as I am not relying solely on either of them for coverage.) Ideal coverage i think would be near center of a room,  but also good to have it near where you are most of the time, and ofc its not always practical to put a purifier in the center of a room. (None of mine are.). So along a wall is OK, and in a corner can be OK esp if you have air movement, so I have a box fan next to one my corner levoits, to help circulate the air.  If it's just  put in a cluttered corner where no air will flow - then it won't be able to do as much.  So you will get better results if air can circulate through it with ease.  So put a fan near a corner unit and that can help offset that for instance. (A fan draws air in towards the back of it, and shoots air out the front - thus driving circulation.). So If you have at least some circulation.....corner units can be OK, but you do need at least a few inches of space from wall.  

If you can afford 800 then probably consider AustinAir, people on here seem to hold it in high regard and one of their good units is 750 I think.   I could never afford that, and have never had Air Doctor,.so I can't say anything on that.  I do love my Levoits but they are good affordable units, that last a long time.  If I had 750 I'd probably get an AustinAir, which has very thick filters and good for odors + VOCs.  (Levoits excellent, but more "normal" purifiers that get particles in the air, they have some carbon in filter but not as much as more expensive units.) Mid range options I could afford are Alen Flex (350+) and Ria Breezeguard (370).  Coways are also highly liked on here, but again, haven't had one so can't speak to that.  So for odors/VOCs id prob recommend AustinAir given that you are fortunate enough to afford it.   That's the one that I've seen recommended for odors/VOCs, and In your price range. (Or maybe 2 350 Alens, if you want coverage in 2 spots.).   The AustinAir filters are pretty expensive, some said theirs lasted years and some said they change them once a year.  My Alen Flex ones are about 90-120 and last me around 11 months avg.  And you get a lifetime warranty with the unit if you maintain the yearly filter replacement with them every 9 or 12 months.  But for 800 budget...look into AustinAir.  Edit: it looks like Levoits newer/larger units like Everest Air have a decent amount of carbon filter, so that's seemingly a decent all-around mid range option too.  But for VOC/odors specifically, Alens same price range units will still be a little better likely, and AustinAir even better.  

I second the 45i is a great unit, and they are sold at some hardware stores and such.  However I would also suggest getting the IQ AIr or Austin Air as well - as those are even better for VOCs - with many more pounds of carbon/charcoal pellets to absorb VOC gasses.  Alen will be the the best you can find at a store.  (They are good at both particulate and VOCs, but for VOcs you need to get it with their best filter, which is like 10-30 bucks more.). They also come with a lifetime warranty if you remain in the filter replacement program.  Although they don't move a huge amount of air so getting a Winix, Levoit, or Coway also a good idea to move more air/better/faster particulate capture.   The IQ Air and Austin Air also don't move a lot of air, so it's best to pair them with units that move a lot of air, so you get full coverage.  (Unless you could afford a lot of VOC minded units, but that is ofc very expensive.) So for me I have a mix of various brands with 2 Levoits, an Alen 45i, a Pure Enrichment Elite , RIA, and many others.  Some are good for VOCs, one has ionizer, and some are just strong for Hepa/participate coverage. In a basement id suggest a corsi Rosenthal box/CR Box.  As they don't look aesthetically pleasing....however for about 90 bucks....it will so about 400CFM power....which probably double the CFM power as all of those VOC type units do.  As VOC units move a bit slower....as that is better for the absorption of the gasses the charcoal/carbon pellets material.   Hepa-focused units will move air more quickly....so better for getting particulates and cleaning your air faster ..as they aren't focused in the VOC aspect (but can still help.). So I would definitely get at least an IQ Air or Austin Air for the VOC issue (they aren't in stores) a few Alens are down for general coverage+ effective at both, and then some stronger units for participate capture, which can be any of Winix, Levoit, or Coway.  All perform pretty similarly in tests of participate capture as the top 3 (with Dyson, which is overpriced for what it does but slightly quieter and with better sensors.).  But if you get a 30 dollar box fan and tape it to a set 4 merc 13+ filters...you get 400CFM power on high....which is as much or more than pretty much every consumer purifier under 400-500 bucks.  (And all the VOC units too.).  Lastly, ventilation for VOCs important as someone else said, so box fans great anyway.  Even putting a merv13+ filter behind a box fan...can help with CFM coverage and get you around 150Cfm...which is = to a 160 dollar air purifier about.    

I think the answer is both.  Although you can just put in a merv 15 or 16 filter yourself in the HVAC I believe, so you may not need to spend thousands of dollars there.   But the HVAC only runs at certain temperatures right ?  Vs air purifiers you can run them 24/7 all the time...for constant coverage.    That Lennox system seems cool, it's Merv 16 filters plus a PCO photocataltyic oxidation light purifier system.  Pco is in some purifiers too.  It can kill germs + converts VOCs into water vapor + carbon dioxide.  (VOCs are gasses essentially, stuff that creates odors, and sometimes even stuff we can't smell, that can still harm us.).  Idk what the data is on the light in that Lennox unit though.  Not an HVAC expert.  So idk if that's worth the money or not.  You can get PCO technology in purifiers such as PuraClenz, kaltech and others. Older  Uvc lights can produce ozone, but apparently newer PCO technology may not produce ozone.  One issue thigh, is that it might produce other unknown byproducts, when various chemical VOCs are converted.  So it's a new technology and IDK what possible compounds could occur.  I believe hfs generally considered safe thigh and I have two units.  (I use them sparingly and not daily like my other units.,) I would avoid the ion stuff as that will create at least a little ozone usually.  I am more comfortable with ionization in purifier units that I can easily toggle on/off.  So a larger unit like that might produce a concerning amount of ozone, idk, and it might or might not be easy to turn off.  But those would be things to consider there. The higher the merv generally good.  You want merv13+ I think esp for virus control.  So Merv 15 is very good.   I would avoid merv 11 as that might not capture certain viruses as well.   So it's a good idea to improve your HVAC, but you still want air purifier coverage for when the HVAC isn't running, I believe.  So you can get clean air with a lot of white hepa filter units they will capture virus particles.  Black carbon strips in fitness can Bind with smoke + help w smoke and odors.  Even better units for VOCs/odors will have like 10-15 pounds of carbon)charcoal pellets ..which absorb VOCs in the air.   You can try absorbing VOCs, or blasting them/covering them with PCO.  White hepa filters can't capture gasses so useless there.  But they are excellent at capturing partuculates, allergens, and viruses, if a good Hepa 13 filter I think.   So you have options.   But this a multiple approach as there are multiple needs.  I have 8x units in a large 2 bedroom apartment, each that does various things.  (One has ionizer, some are good for VOCs with carbon pellets, and some are just good for more HEPA coverage/particulate capture.).   I wasn't sure on safety with the PCO so I don't use those often, as that's a newer technology, and I test units before other people do.  If it were me, and I have the extra funds, I would consider the Lennox thing.  But can't say if I would get that or not.  As you can still get excellent air coverage just from people size + amount from air purifiers.   And you can buy yourself a merv 15 or 16 and prob put that in the HVAC yourself.  (Or have them but it's just a 150-180ish dollar filter, you don't NEED to spend all that money to have clean air.) But if you really want to be thorough....and you have the funds....and if you can toggle it on/off if there is an issue...then maybe consider that.  But you still prob need proper air purifier coverage too.   (I would avoid the ion stuff/merv 11 etc.)  Ionization fine in purifiers, for most, but can produce ozone and respiratory issue in some people.  So needs to be able to toggle on/off for first time user in my opinion.  Ionization can help particles bind together and fall to floor so you dont breathe them in as much.  It can help.  But you still then have particles on floor that need to be vacuumed up.  And some bothered by even small/safe amounts of ozone.  So id avoid In HVAC myself, but I do use daily in my main purifier unit.  White Hepa grade filters most important will capture particles, viruses etc.  That's the main thing.   Good units for VOCs/odors are 1,000 dollar IQ AIr and 750 dollar Austin Air.  Among others.  But those don't move a lot of air, slower better for the carbon pellets to absorb odors.  So best to pair with other units that move more air with HEPA. Lots of good brands there like Winnix, Levoit, and Coway, that all perform well, have various sizes, features etc.  

I have a big purifier right next to my computer myself. (but not because of dust but more so because I have 8x purifiers in a 1 bedroom apartment so that happened to be the best spot for it.) So as others said you dont really need to put a purifier there, although it is more useufl to be near you. But also does not need to be. But next to a computer is an OK place, esp if you are using the computer a lot. But fine anywhere in the room thats gets good airflow. As per units Winix + Levoit are both excellent, however they are not known for being quiet per se. I find my Levoit quiet, and Winix scores about the same in decibel testing. However "quiet is subjective to the user, so you can always run them on low if needed. Thing is, if you run it on low you you are losing a bunch of the CFM effectiveness, so I suggest trying to run high and see if you adjust to minor noise. As CFM ratings are based on it running on high speed. (I got accustomed to the mild noise and now its a nice background noise....that I don't even notice.) Or at least run it on high when not in the room, or try to adjust over time, as you get more out of it the more/higher you run it. But certainly on low most units wont make much noise. My Levoits to me are not loud even on high. (Winix should be same.) I would not get a Xiaomi over Winix or Levoit, as I am not that familiar with Xiaomi, although those might be OK too. I do know that Winix + Levoit are both great. So either of those should be fine. Levoits dont have ionizer unless it says Plasma Pro. Some Winix I think might have it, but idk which models as I dont have Winix myself. (You also dont need ionization but if you get additional units you can always try out one of of those, just make sure you can toggle it on/off in case you dont like it.) But you should be fine with any Winix or Levoit.

I would not buy a Xiomi over a Winix unless there was a substantial price difference. (as in almost for free.) As I think it is a brand with less quality, so the units may break more frequently. As well they seem to discontinue units and then people can't find filters to even use them. Thus why they are cheap. The units I have had the most problems with...with units breaking within 6 months to 1 year...are cheap random brands. (they often usually only have a 1 year warranty.) I would strongly recommend Winnix or Levoit, as those are good quality, you wont be able to not find a filter etc. and they perform the best in recent testing. Here is a recent thread on people saying not to buy Xiaomi. [https://www.reddit.com/r/AirPurifiers/comments/1mgg0bo/do\_not\_buy\_xiaomi\_air\_purifiers/](https://www.reddit.com/r/AirPurifiers/comments/1mgg0bo/do_not_buy_xiaomi_air_purifiers/)

For smoke you need the black carbon strips that bind to the carbon in smoke, so you don't breathe them.  And carbon pellets/activated charcoal that absorb smoke + odors in the air.  The normal white Hepa material is excellent for particulates in the air, but does 0 for smoke + odors.   Some purifiers will have a thin strip of carbon, and maybe even a few pellets, but at the low price range it's not much/would only help a little.  So the most cost effective thing....is probably a ventilator with carbon filter, such as that weed growers use.  AC Infinity makes a line of them and a set of both costs around 120-160.  https://www.amazon.com/AC-Infinity-Filtration-Ventilation-Hydroponics/dp/B09NXKGK89 Another affordable idea is a corsi Rosenthal box, but with carbon filters.  Air Fanta Pro sells their unit with carbon filter for about 15 bucks more (180 I think.). So you might want both that + a ventilator with carbon filter. You can also just buy packs of carbon strips for like 15 bucks...and place around your space, especially around doorways some places where air might seep or where air flow.  Or put one behind a fan..and now you have a DIY carbon filter essentially.   Most typical air purifier units are geared towards particulates, so you would be paying a lot, to get only very little carbon effect.  With most units under 200 bucks or so.  Good units for smoke + VOC would be like an Austin Air which is 750.  IQ Air great but like 1,000 dollars.  Mid-range would be Alen which has different sizes like 250-400 range I think.  But a vebtialtor with carbon filter will be far cheaper and probably more effective for smoke + odors.  Likewise CR box.    A good affordable brand in general is Levoit,and they do have a little carbon in their filters usually...but they can only help a little.  You will need much more than what normal air purifiers can give....unless you have like 10 or 15 or 20 air purifiers each with carbon strip + pellets maybe.  So most cost effective by far...are the other options.  

I personally hate round purifiers since they typically have built in pre filters that you cannot vacuum. That’s why I really prefer Coway (except the 350 and 450 same reason no separate pre filters) as without a separate pre filter you can clean you’ll be changing your filters twice as often. The levoit 600 is otherwise a great purifier. Levoit does have a pre filter but it’s harder to clean imo. The 1512 is a screen you pop off and take a vacuum too with really easy access

With the 1512 for example the HEPA filter is what catches that, not the odor filter or the pre filter. You can vacuum the pre filter with no worries, only things that will be on that is hair lint and dust :)