99.97 percent EFFICIENT AT REMOVING ALLERGENS: True HEPA Air Filter is 99.97 percent efficient in removing airborne allergens as small as 0.3 microns 2-PACK: Includes 2 replacement filters aer1 ...

More than the air purifier brand or price, you should consider the price of replacement filters. The filters of an air purifier needs to be changed at least every 3 months if you use it constantly.

If you have one of these handy appliances at home, chances are you haven't given much thought to when (and even if) you need to change an air purifier filter. But it's something you need to do... and ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› Advice, staff picks, mythbusting, and more. Let us help you. Published August 2, ...