Smart Air Blast - MKII

My approach to managing MCAS has been to put a Corsi Rosenthal box in every for the high CADR, and also a commercial HEPA purifier in every room for the finer particles. My MCAS went absolutely wild last winter so I basically tripled the CADR I had in every room and it has helped so much. My favourite unit is definitely the Smart air blast MKII, there is also a mini version. Quiet but extremely powerful, simple, huge HEPA filter that lasts 2 years. Next I would recommend either a homemade CR box or a premade kit. I'm in Canada so I bought a kit from Northbox systems, Clean air kits is the American equivalent. Can't really beat the CADR on these units, especially when taking into account how quietly they are. /r/crboxes If you want a small commerical purifier, can't go wrong with the Costco Winix units. Price can't be beat and I find the sound of these more pleasant than most commerical purifiers. I have 3 for many years now with no issues. I also have an Air Doctor and a Levoit that I don't recommend. Cheaply built, irritating sound.

I'd strongly consider the Smart air blast full size or mini for your main room. I also have MCAS and I react in any room that doesn't have very high air exchanges per hour. I have a mix of HEPA filter commercial purrifiers and premade Corsi-Rosenthal boxes throughout my house. Northbox systems in Canada and Clean air kits in the USA make very powerful CR box kits that push way more air than any commercial purifier will.

Smart air blast has the best sound of all my purifiers by far

Both will definitely help. On the highest airflow speed called "Turbo", the sound levels directly in front of one will be 60 dBA according to the Decibel X Android app. (I have a C909 and took the measurement.) Two running on Turbo would be 63 dBA. Some may find this quite loud. One Coway Airmega ProX or Smart Air Blast MKII would be quieter on the top airflow speed, but it doesn't come cheaply as I'm sure you've seen.

To echo what u/timesuck said, conventional HEPA purifiers aren't great at removing visible dust unless hugely oversized. They are best for capturing PM10, PM2.5, and PM0.1. If you need something both quiet and powerful, I would tend to recommend the [Smart Air Blast MKII](https://www.smarterhepa.com/products/smart-air-blast). Top sound level is 43 dBA. It has a metal body and locking wheels. The drawback is that because of the tariff situation, the units are mostly out of stock at the moment. There are a few left in the HEPA H13 + activated carbon filter configuration. As with any air purifier, the top airflow/speed setting will offer the greatest Clean Air Delivery Rates (CADRs) and therefore maximum dust collection. Lower speeds have lower CADRs.

Definitely not overkill. I bought the Smart Air Blast mk2 which is also massive and I run it 24/7 at low speed so that it is inaudible. When my neighbor apartments are doing renovation as they are now I can turn it on high to clear the air at a super fast rate. Makes a massive difference in air quality. Bigger air purifiers are best if you can stomach the space cost.

I have 3 cats in my apartment. I'm running the air purifier 24/7 so I went with the Smart Air's Blast (cost around USD630 or something). Makes a huge difference.

Smart air blast MK II best option for standalone allergy/pollen filtration.

Yes. It is the best PM2.5 filter you will find. The full size is a bit quieter and more effective, but large. If you want the best of the best, I would suggest going that route. Yes, I would highly suggest you make sure your HVAC system has appropriate filters on it for your system if possible, to keep the HVAC system clean and reduce mold formation. I would invest in a high end steam cleaner, especially for the floors, as well as a HEPA vacuum such as a Miele or Sebo. I would use the robovacs for vacuuming and mopping maintenance on a daily schedule as well, and try and have minimal carpeting/rugs in the home.

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.

FWIW you need to measure individual rooms and target the best or most frequent areas. The size of the house is somewhat irrelevant as these air purifiers work with smaller spaces. Additionally air purifiers are marketed very deceptively if you are not familiar with CADR or AC metrics. Some manufactures list square footage “up-to” a certain square footage. This is typically for 1 Air change rate an hour. For a decent filter in a room (that is used) you need at least 3 air changes for hour but the recommendation is 4.8 so I use 5 for my measurements. Will smaller air purifiers work? To some degree yes but they will take a very long time to clear out existing particulate matter from the air. So how does CADR fit in? It’s the actual measured rate at which clean air can be delivered by the unit. By knowing the CFM (cubic feet per minute) of the CADR (clean air delivery rate) you can size accordingly. budget constraints can definitely put pressure on your decision making but I would try to go with the larger most cost affordable option to get a better option. My suggestion would be the levoit Everest. Most places have it for $500 but for some reason BBY has them on clearance right now for $299. This single unit my provider more filtered air than the individual smaller units combined. I just added 2 more. Remember over sizing is ok but undersizing will take much longer to clear out existing particulate matter not accounting for new load. Additionally the Everest has wheels and can be easily moved. It is advertised as up to 2656 sq ft. This is for 1 air change. However we can see to hit the target 4.8 air changes to filter the air means this should really be used in a room no larger than 550 sq ft. If that doesn’t work in the budget focus on the smaller rooms for sure and size the air purifier accordingly. Otherwise you may feel like you wasted money and that air purifiers are not working. For what it’s worth I have shark never change (not great for large rooms but nice for bedrooms) the levoit plasma core 600 for our living room, the levoit Everest is in 4 bedrooms (price per performance while on clearance is hard to beat outside of DIY), a smart air blast mkII, and a 20x20 CR Cube with an 16” drum fan (garage) If you’re crafty a DIY Corsi Rosenthal cube can out perform every one of these for under $200 but the aesthetics are not very appeasing. (Hence why mine is in the garage) TLDR - sizing is important and advertising is not straightforward in regards to actual coverage.

Exactly as u stated. All depends on your goal. And yeah I wish I had the Full size smart air blast instead of the mini but they were out of stock. It really doesn't saturate with smells either...it's great

Large Smart Air Blast with a yoorair clean freak after the Hepa. This will cut your CADR/CFM in half. Cost will also go up as well and the carbon filter pad only really last a month. You're still at 200 at the lowest setting and 400 at the highest fan speed. I like yoorair because the thing they wrap around the carbon filter pad doesn't allow carbon dust to leak out but it's like also super dense with a merv 6 rating, the filter pad is like merv 4 if their specs are to be trusted. Or you can just use their carbon filter and change it every 2-3 months.