Learn more. In our tests, we gauge how well an air filter removes dust, pollen, and smoke from the air, and see how freely air flows through the filter at any fan speed. We also calculate the ...

but couldn’t I accomplish the same thing by opening the windows and changing the furnace filters regularly in my HVAC system? How wrong I was. Since acquiring a Levoit 400S air purifier ...

To nip those allergies in the bud, consider adding one simple device to your home -- an air purifier. According to the EPA, an air purifier with a HEPA (high-efficiency particular air) filter can ...