1.Compatible Model: Our MA-40 Replacement Filter with 3-in-1 True HEPA Filter perfectly compatible with Medify Air MA Series Air Purifier 40. Please confirm your air purifier models matches our HEPA Filter parts before purchasing 2.3-Layers of Defense: Our air filter replacement for 40 air purifier is made of 3 Stage H13 Grade True HEPA high filtration efficiency material, effectively attaches at least 99.97% of airborne particles larger than 0.3 microns. The 40 carbon filter is full of carbon particles for better Odour absorption and will not have the trouble of smoke, odors, cooking fumes 3.Super Craft: The True HEPA filters for MA Series 40 Air Purifier adopts composite wet framework filter material. The replacement filter for AP1000 are closely arranged, using high-quality foam adhesive for bonding. Making the MA Series 40 filter for air purifier is not easily deformed and broken to ensure the purification effect. Meanwhile, adopting advanced low energy consumption and low-density structure technology, which can ensure maximum filtration 4.Easy to Install: 40 HEPA filter element for HEPA air purifier is easy to replace, no tools required. Simply take out and replace from your air purifier when needed. It is recommended to replace the True HEPA Filter every 6-9 months, to improve the performance of the air purifier