4 ms·
As the article says, CADR (Clean Air Delivery Rate) is what matters, not whether the filters are HEPA or not. CADR takes into account both the filter rating and
by jerlam 3y ago
As the article says, CADR (Clean Air Delivery Rate) is what matters, not whether the filters are HEPA or not. CADR takes into account both the filter rating and the airflow through the purifier.
The infamous Corsi–Rosenthal Box uses filters which are far below HEPA standards (MERV-13) but since it's moving so much air, it performs better overall with a higher CADR.
- wincy 3y agoHaha we bought 4 box fans and buy 4 filters at once at Home Depot, so we get them for half off with a bulk discount. They’ve helped my wife’s asthma substantially.
- genewitch 3y agoK&N and possibly others make dense washable filters - much better than the green or blue style you see at big box stores. You can spray simple green (or another safe cleanser like that) on the back, and then quickly hit it with hot tap water and let it soak. 20"x20" is ~$30 iirc. for people interested in this style of filter the fans don't last very long, maybe a year or two. They are ~$20+ each. I was buying the highest MERV without carbon for a long time, then i switched to carbon and fiber washable ones, then K&N. Not an endorsement of K&N in particular, i just know the brand and use them.