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Before making your purchase, confirm how long it will take for the unit to actually filter all of the air in a room of your rooms size and how many actual air changes the unit will provide in your room

Purifier manufacturers typically recommend replacing them annually, but check the manual: Some models call for less frequent or more frequent replacement

They appeared adamant that, if the policy was implemented, brands would only be able to compete on price, which would result in lower prices, greater affordability and, consequently, increased consumption

What we recorded: minutes to reach PM1 = 0, residual smell score (110), noise (dBA at 3 ft.), wattage at every fan speed, and annual filter cost

We test each purifier at least twice