Our 40 air filter replacement compatible with Medify Air MA Series Air Purifier 40. Excellent filtration: Captures up to 99.97% of particles as small as 0.03 microns and breaks down unpleasant household odors and wildfire gases. Advanced low energy consumption, low density structure technology to ensure maximum filtration effect. Upgraded electrostatic electret filtration technology saves energy and has a longer service life. Easy to replace, no tools required, just remove from the air purifier and replace. Includes: 2 Packs MA Series 40 H13 True HEPA and Activated Carbon Air Filter