Airmega 400S

If you have high concentrations of particulates (e.g., pollen or smoke particles) and VOCs (which are gases), you need two types of air purifier. This is because most purifiers have very little activated carbon or other sorbent media by weight for gases/vapors/odors/VOCs. Instead, they're designed f

Hi, I created the newest iteration of the Buying Guide. I didn't include the Coway Airmega 300 because in the past, the Coway Airmega 400 would be discounted frequently enough to justify its purchase instead. Annoyingly, there were no good Black Friday or Christmas sales for the Airmega 400 or Airme

In the future, you may want to make a post in this subreddit instead. That would probably yield more views and responses. 😊 Since medium to large is very subjective, it's hard to give exact recommendations. "Cleaning performance" is usually best measured by the Clean Air Delivery Rate (CADR). Higher

Do you know the dimensions of the basement? A room's length x width x height are used to size purifiers. The largest room size the Coway Airmega 400 should be 492 sq. ft. with an 8 ft. ceiling. This is based on the AHAM 2/3 rule and the Airmega 400's Smoke CADR of 328 CFM running on the highest airf

Sounds good, just wanted to be sure as we get loads of people wanting to cut down on the visible stuff. Room volume is 1,960 cu. ft. Divide by 8 ft. to get the "adjusted" purifier coverage rating of 245 sq. ft. Divide again by 1.5 for minimum CADRs of 164 CFM. Coway is usually our first recommendati

Please see the AutoModerator comment. Purifiers aren't good at reducing visible dust particles as they're large and heavy compared to "invisible" pollutants like PM2.5. Purifiers can help reduce aerosols containing viruses, but you should never rely on them alone. Good ventilation and masking are st

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 ozon

So AHAM recommends Clean Air Delivery Rates (CADRs) be a minimum of 2/3 your room's area (assuming an 8 ft. high ceiling). However, if you have allergies or higher-than-normal pollution levels I would choose even higher CADRs. First room needs minimum CADRs of 264 CFM. For this, I would recommend th

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 sal

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 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