Air purifiers
Pick an air purifier rated for at least the floor area of your room at 4.8 air changes an hour, the basis AHAM uses for its suggested room size. Then set the most you want to spend on the maker's own store. After that, choose by the filter name you want (True HEPA, HEPA, HEPA-grade or HEPASilent), how quiet the lowest setting is, whether you want app control, and whether the filter has a carbon layer.
Each list states its selection criteria, and every pick is checked against its maker's page.
Picks list · 7 air purifiers
Rated for 500 sq ft or more at 4.8 air changes an hour (maker figure, or converted from the maker's 1-air-change figure).
Picks list · 5 air purifiers
Lowest stated noise level under 22 dB.
Rated for 200 sq ft or more at 4.8 air changes an hour.
Every air purifier of that kind we track, side by side.
As of , from the specs each maker states.