Capacity is particularly important for an airpurifier, but it's not always clear. Our guide goes through air purifier sizing, room calculations, and more.
We love talking about the more advanced features of smart air purifiers, like the ability to automatically test your air quality and make adjustments, but there’s one basic spec that’s especially important when you’re buying one: Capacity.
Using the CADR Many air purifiers don’t use square feet as a way to show capacity, since this can be a bit relative and confusing. Instead, they turn to a more accurate scale, called the CADR. This number represents how much air the purifier can filter over a set period of time, assuming it has a clean filter. The larger and more powerful the purifier, the higher the CADR rating.
GB-18801 Standard: An Asian standard that incorporates how well-sealed a room is. If your room has fair sealing, you would use CADR x 0.12. If your room is pretty drafty, you would use CADR x 0.08. What is the ACH? This is a rating that stands for Air Exchanges Per Hour, a broad standard used to judge the quality of air purifiers. You can find it with this process:The ACH should be higher than 5 for effective air purifying.
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