21 in. x 10 in. x 4 in. Replacement Particle Filter Compatible with All Blueair 400 Series Air Purifiers (3-Pack)

Harmful pollutants and irritants in your home's air can disrupt your quality of life. Keep your home fresh with replacement HEPA filters and rid your air of dust, smoke, pet dander, pollen, mold and more Does just the thought of springtime make you sneeze Arm yourself with HEPA and battle pollen, ragweed, and grass allergies to help prevent seasonal allergies. A HEPA filter can reduce the amount of pet hair and dander in your air, so you can breathe easy around your pets. Unpleasant odors from cooking, smoke, pets or other projects can linger in your home. HEPA filters can help keep your home smelling its freshest. HEPA filters can remove particles 0.3 microns in size, improving your home's air quality and reducing the spread of sniffles and sneezes.

3 replacement particle filters compatible with all Blueair 400 series air purifiers
Fits the following Blueair 400 classic series air purifiers: 400PF, 401, 401PF, 410B, 402, 403, 410 450E, 455, 455EB
True HEPA filtration captures particles as small as 03 microns from the air passing through the filter, resulting in cleaner and more breathable air
For maximum efficiency, it is recommended replacing filter every 6 months (dependent on air quality and use)