Coway - Airmega 400

Hi, I've 4 coway air purifiers at home (2 bkh). 3 cats furry cats, fabric sofas and couple of large carpets. I'm extremely sensitive with dust and I can feel it in my nose and throat even if it's very little dusty. After getting these coway air purifiers I feel sooo much better. I've used Dysons, Mi, blueair. Out of all of them I love the coways. I have a [Coway Airmega 400](https://uae.sharafdg.com/product/coway-airmega-400-air-purifier-ap-2015f/?cpn=21923874463&pl=&kw=&adg=173662259467&ch=g&utm_source=google&utm_medium=cpc&utm_campaign=LS_SharafDG_Std_Shopping_Bilal_18112024&utm_term=&device=m&utm_matchtype=&utm_network=g&utm_placement=&utm_content=721914495737&utm_Adposition=&utm_location=9198260&utm_Sitelink=}&utm_Audience=pla-2455809539967&utm_campaignid=21923874463&utm_adgroupid=173662259467&gad_source=1&gclid=Cj0KCQjwkN--BhDkARIsAD_mnIr3GqdSYguutizgQurZxifbzxMiU0evhunlX8jR6u0HUgUsoYxvx3MaAvuyEALw_wcB) next to my bed. 2099 AED. I have two [this coway ](https://amzn.eu/d/eT6O53i) in my living room next to the sofas. 999 AED. I have [this one ](https://amzn.eu/d/4pX6sKS) under my work table. The one feature I miss is WiFi connectivity/app to adjust the fan speed or check air quality. Edit: spellings. Edit 2: I use [roborok Q revo S ](https://amzn.eu/d/esM6sND) to keep the floor and carpets dust and fur free.

Its a little pricey, but we just bought a coway airmega 400 (non smart) and its a best of a unit. I have it set to auto so it can turn off or move a lot of air when ut feels like it needs to. I cant speak about there smart version or integrations tho.

This one hands down https://a.co/d/6vakT6u Coway 400 air mega 

We generally don't advise a combined humidifier and air purifier unit. Pushing very moist air over mechanical filtration is not advised, as it could degrade or cause microbial growth on the filter media. Levoit wasn't even mentioned in the [old buying guide](https://www.reddit.com/r/AirPurifiers/comments/w4uhgf/air_purifier_buying_guide_read_before_asking/). We (or really rather one of the moderators here) tend not to recommend cylindrical air purifiers for particulates. This is due to a concern that cylindrical or otherwise round units may have underpowered motors which must operate at higher speeds to provide adequate air flow. This can lead to motor burnout or a shortened purifier lifespan. Additionally, these units tend to have integrated pre-filters which are not ideal. A separate permanent pre-filter is best generally, as they're easier to clean and there's less risk of damaging the HEPA media. I would say Coway has better build quality than Levoit or Winix. If you're treating for dust storms, I would increase the CADRs beyond the minimum 2/3 of a room's area (with an 8 ft. ceiling assumed). You can have all the smart features you listed if you choose a Coway purifier with an "S" appended to the model name. Most Coways look pretty nice IMO. None of these units have much activated carbon for odors, but then again it's not a primary concern for you. For your bedroom, a suitable model would be the [Coway Airmega 250S](https://cowaymega.com/products/airmega-250s). Your living room is a bit trickier if it's about 3x size of your bedroom (living room: 576 sq. ft.). Minimum CADRs here should be 384 CFM, but should probably be at least 400 CFM - 500 CFM for dust storms. Unfortunately there's no one Coway model to fit the bill. Both the [Coway Airmega 300S](https://cowaymega.com/products/airmega-300s) and [Airmega 400S](https://cowaymega.com/products/airmega-400s) have lower CADRs. In this case, you need two purifiers in the living room potentially (mix or match the models mentioned above).

This is why we have **Rule 7: No AI-Generated content**. ChatGPT is frequently wrong. Purifiers can't overcome walls and doors. So unless the 1,000 sq. ft. is an open space, you need at least one unit per room or area. Jafända isn't a recommended brand. And their JF260 model has a top Clean Air Delivery Rate (CADR) of 153 CFM, which is way too low for an open 1,000 sq. ft. space. Do you have a ducted range hood/cooker hood in the kitchen? This is the best option for handling cooking pollutants, which can be oily & deposit grease. [Per AHAM](https://ahamverifide.org/ahams-air-filtration-standards/), CADRs should be *at minimum* 2/3 of a room's area assuming an 8 ft. ceiling. For a 270 sq. ft. room, this would mean at least 180 CFM CADRs. But if someone has allergies or sensitivities, CADRs ought to be higher. Another factor will be sound levels. [According to a *Pediatrics* article](https://doi.org/10.1542/peds.2013-3617), the recommended noise limit in USA hospital nurseries is <50 dBA. So you may need to "oversize" a purifier to run it at a lower, quieter speed while maintaining good air cleaning. We generally recommend Coway first as it's a higher quality brand. You didn't mention overall budget (see **Rule 4**), but a good oversized choice for the baby's room would be the [Coway Airmega 400](https://cowaymega.com/products/airmega-400). The second highest speed/fan setting should still give you plenty of CADRs. We'd still need the length x width x height of the living room/kitchen area.

So I'm assuming you're filtering particulates only. [Per AHAM](https://ahamverifide.org/ahams-air-filtration-standards/), Clean Air Delivery Rates (CADRs) should be *at minimum* 2/3 of each room's area (assuming an 8 ft. ceiling). For the living room, CADRs should be at least **334 CFM**. The master room needs CADRs of **134 CFM**. We generally recommend **Coway** first because of the higher build quality, but their purifiers are more expensive. Your budget is a bit low for the two rooms. The [Coway Airmega 160](https://cowaymega.com/products/airmega-160) ($189.99) could cover the master room. It's more difficult to find just one unit for the large living room. The [Coway Airmega 400](https://cowaymega.com/products/airmega-400)'s CADRs appear to have changed recently, which now read as Dust: 328 CFM | Pollen: 400 CFM | Smoke 328 CFM. I don't know why these values changed. The unit is sold out on Coway's website and I don't know when it will be on sale again. [Sylvane.com](http://Sylvane.com) sells the Airmega 400 in White for $429.99. Alternatively, you could go for the [Winix C909](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html) at [Costco.com](http://Costco.com) ($199.99). This model has an on/off ionizer (do *not* use if you have pet birds). Its Smoke CADR is a bit low (323 CFM), but should be good for the other categories. Drawbacks: the Winix C909 is loud on the highest setting called "Turbo" (around 60 dBA) and the brand itself is more mid-grade. We've had some reports of whirring, whining, or clicking noises after the 2 year mark. This is usually an issue with motor bearings. If you don't mind a bit of assembly and an unconventional look for your living room, see the [AirFanta 3Pro](https://air-fanta.com/products/airfanta-3pro) ($159.99). It's a Corsi-Rosenthal design using Efficient Particulate Air (EPA) E11 filters. E11 is two filter classes below H13 HEPA. The CARB Edition's composite CADR is 413 CFM.

Are you looking to move one purifier between your bedroom and living room? I would *not* recommend Airpura or AllerAir unless you have a serious gas/vapor/odor/VOCs issue that can't be mitigated with source control or ventilation. In that case, you'd choose one of their heavyweight carbon purifiers. Airpura and AllerAir do make more particulates-focused units, but they don't list particulate Clean Air Delivery Rates (CADRs). They're also known for be very loud. Both are Canadian companies that manufacture largely in Canada and some components in the USA. Levoit is lower quality than IQAir and Coway. The [IQAir Atem X](https://www.iqair.com/us/products/air-purifiers/atem-x) you linked in a comment is high quality and has CADRs in the 400s CFM, but it's very expensive per CADR. As for "True" HEPA, I would say that listing the standard and filtration efficiency at Most Penetrating Particle Size (MPPS) gives you the best idea of performance. There are several HEPA standards. But I don't think there's a significant difference between brands on this front; they will still clean your air. The [Coway Airmega AP-1512HH Mighty](https://cowaymega.com/products/mighty-ap-1512hh) you linked is commonly recommended. It's a good price point and attainable for many. But the Mighty has a few drawbacks like being less energy efficient, somewhat loud, and occasionally people have reported balance issues (e.g., purifier "walking" across a floor). The [Coway Airmega 400](https://cowaymega.com/products/airmega-400) was probably recommended in part because it's "oversized" for your bedroom. Oversizing allows you to run the unit on a quieter setting while hopefully maintaining CADRs. ➡️ If you're expecting one purifier to clean both the living room and bedroom areas, I would also recommend the Coway Airmega 400. The highly upgraded pick would be the [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox). Top Smoke CADR is 568 CFM. It has wheels so you can move it around easily and it shows PM10, PM2.5, and PM1.0 concentrations. Obviously the ProX is fairly big. Keep in mind that CADRs apply to the highest airflow speed/setting *only*. Lower settings have lower CADRs, which reduces cleaning effectiveness. Right now there aren't any fantastic sales directly from Coway. But you can use the discount codes **COWAYMEGA10** or **FORYOU10** for 10% off most items.

Not sure where you're seeing the [Coway Airmega 400](https://cowaymega.com/products/airmega-400) CADRs, but I included the Coway product page link in my last comment and now this one. As taken from that page, CADRs are: * Dust: 328 CFM * Pollen: 400 CFM * Smoke: 328 CFM The [Airmega AP-1512HH Mighty](https://cowaymega.com/products/mighty-ap-1512hh) uses the "Vital Ionizer", a bipolar ion generator. Turning it off may affect one or more particulate type CADRs. And if the highest setting is too loud, you'd have to use a lower one... the second highest one would probably give you adequate CADRs. If you didn't want to spend that much on the Airmega 400, you could also consider the [Coway Airmega 240](https://cowaymega.com/products/airmega-240) for your bedroom \[240 is sold out at Coway currently, but still [available from Sylvane.com](https://www.sylvane.com/products/coway-airmega-240-hepa-air-purifier)\*\]. There's a discount code at the moment for Sylvane that gives random discounts - **SPOOKY**. As for third party filters, it's a gamble in terms of like-for-like performance. They may void your warranty. I don't know anything about Cabiclean filters.

...different websites display different levels of expertise or due diligence? There are traditional and online media websites "reviewing" purifiers whose methodologies, criteria, or testing will vary. Many product review articles authors are journalists, not HVAC or air quality engineers. And the underlying goal of some websites may be to drive viewers towards referral or affiliate URLs to make money. You have to compare apples to apples. RTings.com has tested only 2 Coway models and 2 Winix models. There are no Smart Air, IQAir, Alen, or Medify Air units. I'm looking forward to RTings.com testing more purifier models. But right now, the test selection isn't impressive... there are a lot of Dyson purifiers. As stated on one of your other posts, we generally like Coway for the build quality, performance, and quiet operation. The ProX, 400S, 400, 300S, 300, IconS\*, and Icon\* come with a 5 years warranty. All other Airmega models have a 3 years warranty. Link: [https://cowaymega.com/pages/warranty-registration](https://cowaymega.com/pages/warranty-registration) \*We do not recommend the Icon / IconS, as they have poor CADRs for the money. The Levoit EverestAir is the best purifier Levoit makes with lots of extra features. Some of the CADRs are a bit low (373 CFM for Dust and 354 CFM for Smoke). Top sound level according to HouseFresh is 57.8 dB; note this isn't an A-weighted decibel rating. Warranty period is 2 years. Don't know how the EverestAir's build quality compares to Coway's higher end offerings.

First, air purifiers aren't very good at reducing visible dust. It's comparatively large and heavy. You can capture more visible dust by oversizing a purifier. If you have high pollution levels, it's recommended to oversize a purifier. I don't know how much you want to pay for a purifier and its filters. That's why we ask for a budget. You're requesting "the best". Quality and cleaning capacity aren't cheap. For the 12' x 20' room, the [Coway Airmega 400](https://cowaymega.com/products/airmega-400) should fit hopefully. The [Airmega 400 Max2 Filter Set](https://cowaymega.com/products/airmega-400-max2-filter-set?variant=33436452323463) is $129 at most, but can be bought for $83 on Amazon. This purifier is for **particulates** (dust, dander, mold spores). However, this model is *not* good for odors. Odors are gases. If you want something cheaper for **particulates only**, have a look at the [Winix C909](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html) sold at Costco.com. You can buy [replacement filters at The Home Depot ($27.99)](https://www.homedepot.com/p/Winix-True-HEPA-4-Filter-Activated-Carbon-Replacement-Filter-A-115115/202034412). Keep the PlasmaWave function turned off. Like I said before, the AllerAir you linked will NOT be good for particulates. AllerAir is for **gases/vapors/odors**. Replacement carbon canisters will be expensive: anywhere from $219 to $336. That is just the nature of high weight activated carbon purifiers. This is why I said you need two different purifiers: one for particulates and one for gases/vapors/odors.

The Coway Airmega 400 (and all other current Coway models) have very little activated carbon by weight. You need pounds of activated carbon for long-term or higher levels of gases. To boot, certain gases require modified activated carbon to increase removal efficiencies. It can be tricky to get the right carbon type or blend. Winix's PlasmaWave is safe for humans. Models with this feature are certified to produce very low levels of ozone. However, certain small animals may be more vulnerable to smaller ozone increases (usually birds). I saw you had reptiles, so I recommended keeping it off to be cautious. It's very difficult to say on the AllerAir, as many factors are involved. See this FAQs wiki page entry: [https://www.reddit.com/r/AirPurifiers/wiki/index/faqs/#wiki\_when\_should\_i\_change\_my\_activated\_carbon\_or\_other\_sorbent\_media\_filter.3F](https://www.reddit.com/r/AirPurifiers/wiki/index/faqs/#wiki_when_should_i_change_my_activated_carbon_or_other_sorbent_media_filter.3F)

I noticed you said your ceiling measurements aren't actually 12 ft. But to address your original scenario: >Did I do my math correctly in seeing that my max CFM requirements are 175 CFM's? Not quite. It would vary by room, but I'll use just one example. *Minimum* (not maximum) CADRs for the living room would be calculated the following way for [AHAM's 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/). 2,160 cubic ft. ÷ 8 ft. = 270 sq. ft. as the "adjusted" purifier coverage rating. Then, 270 sq. ft. ÷ 1.5 = 180 CFM. Minimum CADRs for the living room would be 180 CFM. However, we generally recommend higher CADRs if you have allergies or asthma to reduce the severity or onset of symptoms. And since you want to run purifiers at a lower speed anyhow, oversizing would definitely be recommended. Unfortunately many brands do not list CADRs for airflow speeds/settings other than the highest one. Lower speeds have lower CADRs of course. ➡️ I would definitely recommend the [**Coway Airmega 240**](https://cowaymega.com/products/airmega-240) instead of the Airmega 250. The Airmega 240 is quieter, cheaper, more energy efficient, and has higher CADRs. If you really wanted to oversize, I would recommend the [Coway Airmega 400](https://cowaymega.com/products/airmega-400). The top-of-the-line and very quiet [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox) is a fantastic price (in Mocha Beige only) right now, but it would be very big. If you want to calculate energy costs, use this [U.S. DOE Appliance Energy Calculator](https://www.energy.gov/energysaver/estimating-appliance-and-home-electronic-energy-use). Unfortunately most Coway purifiers aren't discounted right now. But sale prices pop up very frequently. Check back daily. Additionally, you can also utilize discount codes like **FORYOU10** or **COWAYMEGA10** for 10% off even on discounted models (most of the time).

Most common air purifier brands do not have very much activated carbon or another sorbent media by weight for gases, vapors, or odors (including VOCs). Therefore the activated carbon could become saturated way faster than the HEPA filter. Do you have elevated concentrations of VOCs? If you wanted to know the gaseous species present, you'd need air testing with Gas Chromatography-Mass Spectrometry (GC-MS) analysis. Even then, I would definitely focus on source control and ventilation (e.g., installing and configuring a Energy Recovery Ventilator or Heat Recovery Ventilator) first. This is because heavyweight sorbent media purifiers are very expensive, very loud, and clean the air more slowly than particulates-focused air purifiers due to the need for ["dwell time"/"residence time"](https://www.airscience.com/carbon-filters). Example brands are Airpura and AllerAir. Another issue is that plain/chemically untreated sorbent media do not have high removal capacities for all gaseous species. We've had reports of odors emanating from activated carbon (sometimes "sweet" smelling, which could be not-well-adsorbed acetaldehyde) or spikes on tVOC monitors despite a reduction in odors. **Particulates Purifier** NB: unfortunately air purifiers aren't good at reducing *visible* dust. It's large and heavy in comparison to "invisible" pollutants like PM10, PM2.5, and PM0.1. Therefore it tends to fall and settle on surfaces unless very close to a purifier's intake. Additionally, see the [sticky post at the top of this subreddit](https://www.reddit.com/r/AirPurifiers/comments/1jxgjwf/sticky_purifiers_and_dust_reduction/). You'll need to consider sound levels too. This is covered under the header ["Regarding Infants and Young Children"](https://www.reddit.com/r/AirPurifiers/wiki/index/how_to_choose_an_air_purifier_for_particulates/#wiki_regarding_infants_and_young_children) in our "How To Choose An Air Purifier for Particulates \[Comprehensive Guide\]". I would tend to recommend the [Coway Airmega 400](https://cowaymega.ca/products/airmega-400). You can run it on the second-highest airflow speed which should still give you very good CADRs. If you buy directly from Coway, use the discount code **COWAYMEGA10** for an additional 10% off. This should bring the cost down to $530.15 CAD.

While there are salient points about air pollution and indoor air quality, Jaspr is not good considering the price: $1,199 USD for Clean Air Delivery Rates (CADRs) in the mid-300s CFM. By comparison, you can get a [Coway Airmega 400](https://cowaymega.com/products/airmega-400) with CADRs from 328 CFM - 400 CFM for $366 USD currently. [I went back and forth with the founder about their spurious claims](https://www.reddit.com/r/AirPurifiers/comments/1gspgqd/comment/lxg2uxz/) (warning: very long). He used to run a marketing company which explains Jaspr's propensity for slanting the truth.

No, one [Winix C610](https://www.winixamerica.com/product/c610/) wouldn't be enough. The [Winix 5510](https://www.winixamerica.com/product/5510/) would be underpowered too. I would base my choice off of Clean Air Delivery Rates (CADRs), not Air Changes per Hour (ACH). See the AutoModerator comment about the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/). For an open 500 sq. ft. space, *minimum* Clean Air Delivery Rates (CADRs) should be **334 CFM**. This assumes the ceiling height is 8 feet. The Winix C610 has CADRs of: * Dust: 252 CFM * Pollen: 262 CFM * Tobacco Smoke: 248 CFM If you want a conventional HEPA purifier, it's going to be hard to find one unit that isn't very expensive and large. A model that is slightly short on dust and smoke CADRs is the [Coway Airmega 400](https://cowaymega.com/products/airmega-400). (The [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox) exceeds min. CADRs, but it's large and very expensive.) The [Alen BreatheSmart 75i product page](https://alen.com/products/alen-breathesmart-75i-air-purifier?variant=13172054491203) claims an averaged (?) CADR of 375 CFM with a big price tag of $799. This is probably using the "Pure" Allergen Collector filter. [Energy Star says the BreatheSmart 75i (version 2.0)](https://www.energystar.gov/productfinder/product/certified-room-air-cleaners/details/3417462) has CADRs of: * Dust: 351 CFM * Pollen: 431 CFM\* * Smoke: 370 CFM \*Likely with the ionizer turned on. Turning the ionizer off will probably decrease Pollen CADR. Alternatively, you can buy multiple smaller purifiers whose combined CADRs meet or exceed the minimum 334 CFM values. Just remember that CADRs for purifiers are for the highest airflow speed/setting only. Lower settings have lower CADRs.

So the issue is that most common purifier brands have little sorbent media (such as activated carbon) for odors. This includes Coway, Levoit, Winix, Medify Air, Smart Air, Honeywell, Blueair, etc. Instead, they are designed to capture particulates. Musty and old odors may be caused by high relative humidity (RH) and/or high carbon dioxide levels. For high RH, you need a dehumidifier. For CO₂ levels, you need "fresh" (oxygenated) air ventilation. This can be achieved via open windows or installing an Energy Recovery Ventilator (ERV) / Heat Recovery Ventilator (HRV). It's important to control relative humidity for reasons beyond mold prevention. With a heavyweight sorbent media purifier, certain sorbents can adsorb water vapor from the air. This would likely shorten the filter's working life. As for a purifier that captures particulates for allergies, it really depends on your budget. Oversizing allows you to run a purifier at a lower airflow speed while maintaining CADRs. The issue is that vast majority of brands list CADRs only for the highest airflow speed/setting. **Particulates Purifiers:** I would tend to recommend the [Coway Airmega 400](https://cowaymega.com/products/airmega-400). Unfortunately the sale price ($366) ended for this model yesterday and it's back up to its full price of $649. If you can hold out, you may want to wait for another sale. [Amazon is cheaper right now for the Airmega 400 in Graphite ($399)](https://www.amazon.com/Coway-Airmega-Purifier-sq-ft-White/dp/B0722YZ1R1/?th=1). You could also opt for two purifiers, such as two [Coway Airmega 240](https://cowaymega.com/products/airmega-240) units. And if you want to order directly from Coway, use the discount codes **COWAYMEGA 10** or **FORYOU10** for 10% off. **Gases/Vapors/Odors:** Heavyweight sorbent media purifiers are very loud, very expensive, and clean the air more slowly than particulates-focused air purifiers due to the need for "dwell time"/"residence time" + thick media beds. Example brands are Airpura and AllerAir. A more entry-level unit from AllerAir would be around $600. To boot, most Airpura and AllerAir standard activated carbon options are plain/chemically untreated. Plain/chemically untreated carbon and other sorbents do not have high removal capacities for all gaseous "species". Some people report "sweet" odors emanating from the carbon beds, which may be the not-well-adsorbed acetaldehyde. Other times there are spikes on tVOC monitors despite a reduction in odors. In order to increase removal efficiencies, you need to impregnate activated carbon or another sorbent, usually called impregnation or wet-mixing. Potassium permanganate (KMnO₄) appears to be a more common impregnant. It operates in part by breaking down certain gases via redox reactions. Problematic byproducts may be generated depending on your air chemistry, although this is usually more of a concern in totally unknown/high complex air chemistries. KMnO₄ also has a tendency to off gas as it saturates or loses efficacy. If you want to experiment with something cheaper, you could have a look at the [Oransi TrueCarbon 150C](https://oransi.com/products/truecarbon-150c-air-purifier). It uses 3.2 lbs. of KMnO₄ impregnated activated carbon. Keep in mind this isn't very much of a sorbent medium by weight.

There are some Black Friday \[BF\] deals already, but I think there may be more to come in the week leading up to Thanksgiving or BF. I would generally recommend **Coway** first. They're one of the highest quality consumer-grade brands. I think their larger and more powerful models may not be discounted yet. * Four bedrooms, 1,400 cubic feet: [Coway Airmega 250](https://cowaymega.com/products/airmega-250) \[discounted\] or [Coway Airmega 240](https://cowaymega.com/products/airmega-240) \[currently out of stock from Coway\]. * Master Bedroom: [Coway Airmega 250](https://cowaymega.com/products/airmega-250) or [Coway Airmega 400](https://cowaymega.com/products/airmega-400) \[full price; likely will be discounted closer to BF\] * Living Room, \~2,160 cu. ft.: [Coway Airmega 250](https://cowaymega.com/products/airmega-250) or [Coway Airmega 400](https://cowaymega.com/products/airmega-400) * Open Space, \~12,600 cu. ft.: no single purifier will cover this space. You would need *two* [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox) units to meet AHAM 2/3 rule minimum CADRs of 1,050 CFM. Obviously nowhere close to your budget anyways, but don't buy the [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox) at full price ($999). It could drop to $619 - $649. For the open space, you may want to consider large DIY Corsi-Rosenthal boxes with [MERV](https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating) 13/14 furnace filters and PC fans. We generally recommend the [3M Filtrete MPR 1900 MERV 13](https://www.filtrete.com/3M/en_US/p/d/b00039899/) (1-inch deep) filters for C-R boxes. A guide is here: [https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c?gi=a61b9774d0dd](https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c?gi=a61b9774d0dd) A less DIY approach would be to buy several [AirFanta 3Pro](https://air-fanta.com/products/airfanta-3pro) units. It uses Efficient Particulate Air (EPA) E11 filters. Top composite CADR for the CARB-certified edition is 413 CFM.

Yes. The Coway Airmega 400 sometimes drops in price enough to justify purchasing instead. Last year in the run up to Black Friday, the Airmega 400 was $349. In 2024, I also saw the price around $369 occasionally. Right now, the Airmega 400 is full price. This usually happens before a significant sale. Some discount codes may still work with sale prices too. These are **COWAYMEGA10** and **FORYOU10** for 10% off. Performance-wise, there's an appreciable difference between the Airmega 300 and Airmega 400 for the top Smoke and Pollen CADRs.

Because your ceilings are higher than 8 ft., we need to calculate by volume first and then divide by 8 for the "adjusted" purifier coverage rating. The bedroom has an adjusted purifier coverage rating of 437.5 sq. ft. Minimum CADRs would be 292 CFM. Not sure how big your living room is, as you didn't list its dimensions. Let's just say it's 450 sq. ft. with a 10 ft. ceiling. Adjusted purifier coverage rating is 562.5 sq. ft. Minimum CADRs needed are 375 CFM. I normally recommend Coway. The bigger units ([Coway Airmega 400](https://cowaymega.com/products/airmega-400) and [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox)) are currently not on sale directly from Coway. And I definitely *don't* recommend buying either model at full price. Both the [Airmega 400](https://www.sylvane.com/products/coway-airmega-400-air-purifier) and [Airmega ProX](https://www.sylvane.com/products/coway-airmega-pro-x-large-space-air-purifier) are cheaper at Sylvane for the moment. **Alternatives** * Bedroom: [Levoit EverestAir-P](https://us.vesync.com/product-detail/levoit-everestair-p-smart-air-purifier-525) (from the VeSync Store) * Living Room: [Levoit EverestAir-P](https://us.vesync.com/product-detail/levoit-everestair-p-smart-air-purifier-525) \+ [Levoit Vital 200S-P](https://us.vesync.com/product-detail/levoit-vital-200s-p-smart-air-purifier-560) The EverestAir-P has a top Smoke CADR of 354 CFM. So if your living room is roughly the equivalent of 562.5 sq. ft. or larger, you would need the Vital 200S-P to meet minimum CADRs.

Per the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/), a 300 sq. ft. space needs a minimum of 200 CFM Clean Air Delivery Rates (CADRs). Since this is also an office, I assume quiet operation is needed too. Therefore you need to "oversize" a bit so you can run the purifier on a lower setting with adequate CADRs. I tend to recommend Coway as it's a high quality consumer-grade brand. The [Coway Airmega 400](https://cowaymega.com/products/airmega-400) should be a very good fit. Right now, the Airmega 400 is full price at Coway. I wouldn't buy it right now, as Coway's sales are frequent enough; last year, the Black Friday price was $349.) You may also want to check Sylvane and Amazon for deals. If you decide to buy from Coway, try using discount codes **COWAYMEGA10** or **FORYOU10** for 10% off. These are the standard e-mail sign-up codes. Keep in mind the CADRs listed for purifiers apply to the highest speed/setting only. Lower settings have lower CADRs which reduces cleaning effectiveness.

Your math is correct. And if you're super sensitive to allergens, we often recommend even higher CADRs. Of course if you had pristine air, there would be no need for a purifier. Normally I would suggest the [Coway Airmega 400](https://cowaymega.com/products/airmega-400), but certainly **not** at its current full price. Coway's sales happen frequently enough - 2024's Black Friday saw the price drop to $349. And normally the full price doesn't stick around for long anyways. The [Coway Airmega 350](https://cowaymega.com/products/airmega-350) is definitely better value for CADRs, more energy efficient, and has a cheaper filter. However, it does have an integrated pre-filter and a shorter warranty period than the Airmega 400. I don't know how the two models compare in terms of sound levels. If you need something right away, you could build one large or multiple Corsi-Rosenthal boxes with [MERV](https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating) 13/14 furnace filters and PC fans. CADRS will depend upon airflow speed, # of PC fans, # of filters, and filter size. You may want to add a fine mesh pre-filter to prevent coarse particulates from clogging the MERV filters. A guide: [https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c](https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c) Another solution may be the [AirFanta 3Pro](https://air-fanta.com/products/airfanta-3pro). It uses Efficient Particulate Air (EPA) E11 filters, which is two filter classes below HEPA H13. Top composite CADR is 413 CFM for the CARB-certified edition. Drawback: it does not have a fine mesh pre-filter, but rather metal grating. The Black Friday deal means 10% off, so the 3Pro is currently $144.00.

Purifiers aren't good at reducing *visible* dust and pet hair. Both are large and heavy compared to "invisible" pollutants like PM10, PM2.5, and PM0.1. [AHAM's 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/) recommends CADRs be *at least* 2/3 of your room's area (assuming an 8 ft. ceiling). However, people with allergies or asthma should aim for even higher CADRs. Your "adjusted" square footage based on cubic volume is 229 sq. ft. Minimum CADRs would be 153 CFM, I would increase this to 250 CFM or so. Neither model uses an ionizer. The [Coway Airmega 350](https://cowaymega.ca/products/airmega-350) has higher top CADRs and is more energy efficient (watt per CADR) than the Airmega 400. The [Airmega 400](https://cowaymega.ca/products/airmega-400) has a [longer warranty](https://cowaymega.ca/pages/warranty-registration) (5 years), separate permanent pre-filters, and may be somewhat quieter than the Airmega 350. The Airmega 350's "Fresh Starter" filter will likely be cheaper than the Airmega 400's filter set. There may be two alternative replacement filters for the Airmega 350 as well. In the USA, the Airmega 350's "Fresh Starter" filter is $79.00 USD at full price. The Airmega 350 seems to have good reviews thus far, but it was released earlier this year in Canada. The Airmega 400 has a great track record which is why it's recommended frequently here. I would lean toward the Airmega 400. But the Airmega 350 should be very good too.

No, Dyson is one of the worst! The HP09 has terrible Clean Air Delivery Rates (CADRs). They just know how to market effectively. As **Rule 4** and the AutoModerator comment repeats, it's helpful to know the ceiling height. I'll assume it's 2.4 meters. 60 m^(2) x 2.4 = 144 m^(3). For rooms measured in meters, CADR should be at least 3 times a room's volume (in m^(3)). So the minimum CADR should be 432 m^(3)/h. If you have [allergies, health conditions, high pollution, etc.](https://www.reddit.com/r/AirPurifiers/wiki/index/how_to_choose_an_air_purifier_for_particulates/#wiki_when_higher_than_normal_cadrs_may_be_needed), multiply the room's volume by 4-6. So CADRs of 576 - 864 m^(3)/h. Coway is a high quality brand that's relatively quiet. I don't know exactly where you are, so I don't know what's available to you. But the [Coway Airmega 400](https://www.amazon.co.uk/purifier-restaurant-certified-HyperCaptive-filtration/dp/B099S9Y285) would be a very good fit (Amazon UK website linked). If you can't find that, the Coway Airmega 300 might suffice... although you may want to supplement it with a smaller Coway model like the Coway Airmega Jet.

I wouldn't use ChatGPT or another AI tool to find a purifier. It's frequently wrong about specifications or other details. And I wouldn't recommend Dyson. Their units provide poor particulates cleaning for the money. Per **Rule 4: Information For Air Purifier Requests**, I don't know your country of residence or your budget. I'm guessing you're in Saudi Arabia. The acronym you mentioned is CADR (Clean Air Delivery Rate). As u/timesuck said, purifiers aren't good at reducing visible dust particles as they're large and heavy compared to "invisible" pollutants like PM2.5. Vacuuming and dusting are the better solutions for visible dust capture. I would recommend a bagged vacuum with a HEPA exhaust filter from brands like Miele or Sebo if available. Another important matter is sound output. Infants and young children shouldn't be exposed to overly loud purifiers. According to a *Pediatrics* article, USA hospital nurseries have a recommended sound limit of 50 dBA. Because of this, you'll want to oversize a purifier so you have ample CADR without being too loud. For rooms measured in meters, I would select a high CADR. If PM10 and PM2.5 pollution concentrations are high, I would go with a CADR six times the room's volume in m^(3). Let's assume the nursery has a 2.4 meters high ceiling. Room volume is then 72 m^(3). 72 m^(3) × 6 = 432 m^(3)/h CADR. I would tend to recommend the Coway brand first as they're high quality, energy efficient, and relatively quiet. Something like the **Coway Airmega 400** (top CADR: 677 m^(3)/h) would be great. But it's also expensive. A good choice would be the **Philips Smart Air Purifier PureProtect 4200 Series** (top CADR: 600 m^(3)/h). Keep in mind the CADRs listed for these purifiers apply to the highest airflow speed/setting only. Lower settings have lower CADRs which reduces cleaning effectiveness. Lastly, these two purifiers have little capacity for capturing gases, vapors, odors, or VOCs. This is due to very little activated carbon by weight. Unfortunately you need many pounds of activated carbon or other sorbent media. Heavyweight sorbent media purifiers are very loud and very expensive.

It's difficult to buy just one unit that's great at removing particulates (e.g., pollen, dander, soot, smoke particles, small dust particles, etc.) *and* gases/vapors/odors/VOCs. Most particulates purifiers have very little activated carbon or sorbent media by weight. Oppositely, heavyweight sorbent media purifiers clean the air more slowly than particulates-focused units for several reasons. The thick beds leave less room for mechanical filters (the latter meant for particulates). There's also the need for ["dwell time"/"residence time"](https://www.airscience.com/carbon-filters) for optimized gaseous removal. Unfortunately heavyweight sorbent media purifiers are very loud and very expensive. Infants and young children shouldn't be exposed to overly loud units; a *Pediatrics* [article states the recommended sound limit for US hospital nurseries is 50 dBA](https://doi.org/10.1542/peds.2013-3617). To boot, sometimes you need specially modified sorbents depending on the VOC "species" in your air. Plain/chemically untreated sorbents do not have high removal efficiencies for all gaseous species. **For a list of VOCs and their concentrations, air testing with Gas Chromatography-Mass Spectrometry (GC-MS) analysis is required.** An example of a business performing air testing and analysis is [Fike Analytical Technologies, LLC](https://fikeanalytical.com/). Don't know if they work nationwide. This is why we recommend source control and ventilation strategies first for gases or VOCs. Building-wide solutions could be an Energy Recovery Ventilator (ERV) or a Heat Recovery Ventilator (HRV). # Particulates purifiers I think the concern about Coway's Green HEPA media is overblown, but it's your decision of course. If you change your mind, I might go with the Coway Airmega 400. *Don't* buy the 400 at full price; look for prices of $349 - $450. You may want to consider the [Smart Air Blast Mini MKII](https://www.smarterhepa.com/collections/air-purifiers/products/smart-air-blast-mini) or the [Smart Air Blast MKII](https://www.smarterhepa.com/products/smart-air-blast) instead if you want to avoid antimicrobial coatings. The drawbacks: the Blast Mini and full size Blast are not as energy efficient as the Coway Airmega 400. Both Blast models have an optional activated carbon filter, but the weight of carbon is very low for treating VOCs.

Is the $400 a grand total for all purifiers? If so, that's very low given the room sizes. Use the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/) for minimum CADRs as listed in the AutoModerator comment. * A 400 sq. ft. living room needs minimum CADRs of 267 CFM. * The 200 sq. ft. dining room plus hallway requires min. CADRs of 134 CFM. * The 350 sq. ft. bedroom needs min. CADRs of 234 CFM. These CADRs should be even higher if you're dealing with mold spores or other allergies. Coway is a high quality consumer-grade brand and usually our first recommendation. * Living Room = [Coway Airmega 400](https://cowaymega.com/products/airmega-400) * Dining Room + Hallway = [Coway Airmega 240](https://cowaymega.com/products/airmega-240) * Bedroom: [Coway Airmega 400](https://cowaymega.com/products/airmega-400) Unfortunately the Airmega 400 is full price (I would always wait for a sale or shop around until it's down to $400 or less) and the Airmega 240 is currently out of stock. **Alternative conventional purifiers** Levoit is considered good value but lower quality than Coway. You could choose the [Levoit EverestAir-P](https://us.vesync.com/product-detail/levoit-everestair-p-smart-air-purifier-for-home-large-room-525) each for the Living Room and Bedroom. The Dining Room + Hallway could be covered by a [Levoit Vital 200S-P](https://us.vesync.com/product-detail/levoit-vital-200s-p-smart-air-purifier-560). You may want to buy from the VeSync Store where you'll see coupon codes on product pages. **Corsi-Rosenthal boxes or similar** Lower single pass filtration efficiency, but can have higher CADRs. You could build large Corsi-Rosenthal boxes with [MERV](https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating) 13/14 furnace filters and PC fans. PC fans are much quieter than box fans. CADRs depend upon airflow speed, # of fans, # of filters, and filter size. A guide: [https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c?gi=c696869dfc85](https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c?gi=c696869dfc85) For less assembly.... consider an [AirFanta 3Pro](https://air-fanta.com/products/airfanta-3pro) for each room or area. The 3Pro uses Efficient Particulate Air (EPA) E11 filters, which is two filter classes below HEPA H13. Top composite CADR is 413 CFM.

Yep, they're definitely expensive. And I recommend the [Airmega 400](https://cowaymega.com/products/airmega-400) only when discounted (e.g., $349 - $450), but it's been full price through Black Friday *and* Christmas 2025 annoyingly. \*[Coway Airmega 400S in White is $577 right now](https://cowaymega.com/products/airmega-400s?variant=33436459892871), but IMO smart capabilities aren't worth the extra money.

If you need to filter particulates (e.g., smoke particles) *and* smoke gases/vapors/odors/VOCs, you really need two types of air purifier. Most common purifier brands have very little activated carbon or other sorbent media by weight. They are designed to capture particulates quickly. You need many pounds of sorbents for longer-term or high concentrations of gases/vapors/odors/VOCs. Heavyweight sorbent media purifiers are very loud, very expensive, and clean the air more slowly than particulates-focused units. This is due to the need for "dwell time"/"residence time" and the thick media beds. If you're in a country outside of the USA and Canada, you have fewer choices for sorbent media purifiers. Usually the only choice would be the IQAir GC or GCX series units, specifically models using potassium permanganate (KMnO₄) impregnated activated alumina. KMnO₄ improves the removal (via redox reaction) of formaldehyde.\* As for VOC or PM2.5 sensors, most consumer-grade purifiers use very cheap and inaccurate ones. I would invest in a standalone AQI monitor like the [PurpleAir](https://www2.purpleair.com/products/list) (Flex or Zen models) or the [AirGradient ONE](https://www.airgradient.com/indoor/). These are more accurate. Of the brands & models you listed, the Coway Airmega 200M would likely be best. I'm unsure if other Coway models are offered, but I would more strongly recommend the Coway Airmega 240, Coway Airmega 250, or Coway Airmega 400 if they are available to you. \*As an oxidizer, KMnO₄ has the potential to produce problematic byproducts depending on the gases in the air. This is usually an issue with highly complex or unknown air chemistries (fires in the built environment or chemical spills).

Blueair models often have high CADRs for less money. However, they use an always-on ionizer to enhance the mechanical filter's efficiency. Some people don't like ionizers as they *could* alter air chemistry or induce negative health effects. That being said, Blueair is certified for extremely low ozone emissions. The [RabbitAir MinusA2](https://www.rabbitair.com/products/minusa2-air-purifier) has a top Smoke CADR of 180 CFM. Warranty is 5 years. Depending on whether you want Wi-Fi or not, the price is $619.95 or $599.95. Certain decorative front cover options add another $20. The largest room size the MinusA2 could handle would be 270 sq. ft. with an 8 ft. ceiling. This is based on the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/). For wildfire smoke, the largest room size shrinks to 180 sq. ft. with an 8 ft. ceiling. Currently, you can buy the [Coway Airmega 400S in White for $577](https://cowaymega.com/products/airmega-400s?variant=33436459892871). This model with an "S" has Wi-Fi capability. Top Smoke CADR is 328 CFM. Warranty is 5 years. I usually prefer the [Coway Airmega 400](https://cowaymega.com/products/airmega-400) when it's on sale (e.g., $349-$480). Hasn't been discounted in a while... not sure why. IMO the higher end Coway models are much better value for money.

Hello! Is this the U.S. EPA's AQI? IQAir generally uses the U.S. AQI for their world air quality map. Each country or region may have its own AQI which assigns different concentration break points to a range of values. PM2.5 is normally given in µg/m^(3). **Purifiers are usually sized by each room or space. So it would be very helpful to have the dimensions of bedrooms, living rooms, etc.** Most Dyson devices with air purification functions are very poor at cleaning the air. A Coway Airmega 150 is meant for small rooms only. Its top Smoke CADR is 153 CFM. Two Airmega 150 purifiers running at top speed would have a combined top Smoke CADR of 306 CFM. The Levoit Core 600S has a top Smoke CADR of 391 CFM, so it's much more powerful than a single Airmega 150. Keep in mind the CADRs I'm listing apply to the highest airflow speed/setting only. Lower settings have lower CADRs which reduces cleaning effectiveness. I'm not a huge fan of Blueair because of the always-on ionizer. For PM2.5, I tend to recommend strictly mechanical filters. Coway is generally a higher quality brand than Levoit, but you have to buy according to room dimensions and consider particulate matter concentrations. Coway tends to be more expensive, both for the initial purchase and replacement filters. Something more powerful would be the Coway Airmega 400 with a top Smoke CADR of 328 CFM. You may also want to consider Philips as they have high CADR units like the PureProtect 3200 and PureProtect 4200 series models. I don't know if they're sold in the UAE.

Coway airmega (non-smart) has been a game changer. Been using it since 2020 with 3 cats and multiple seasons of prolonged smoke from wildfires.

https://preview.redd.it/eg2z5elc25sf1.png?width=333&format=png&auto=webp&s=a0a52b370fe0c79399923b0d9eb4eefd01d71503 The screenshot shows the PM2.5 count in my balcony vs the PM 2.5 count in my living room with the air purifier on (Coway 400). When I turn the purifier off, the indoor reading goes back up to match the balcony level. So the purifier is clearly making a big difference.

Yup, we splurged on a couple coway airmega 400 purifiers when we were living in Seattle and are glad we brought them with us to Minneapolis since we bought an older craftsman home without a duct AC system (which typically allow air filters). This past week would have been really rough for my asthma without air purifiers running!

Just wanted to say your comments are so educational! I wish I had found this sub before purchasing my air purifiers but I did end up getting the Coway airmega 400 for my living room, coway 160 for my sons bedroom and have a few Costco winix in the other rooms. The coway sees to pick up much more dust and smells than the Winix. Currently have construction going on in our home and the coway have really picked up so much.

I agree with others. Coway. Which model really just comes down to size of room they all use the same type of filter (though sometimes different sizes). I have a couple AirMega 300/400s because I have a big open space and they've been great. But the smaller ones are the same tech and filter type, just smaller.

Coway is very good. It’s not worth paying the extra for the WiFi/app capabilities. The 1512hh is what is usually recommended, but just get the one that’s the right size for your space, or if you want aesthetics. I have two 400s and I just bought a 150 for my office.

The air Fanta is a corsi rosenthal box. You can make those yourself. I have the coway 400 and it’s welllllll worth the money.