Nispira premium HEPA and activated charcoal air filter replacement compatible with MA-40 and MA-40W air purifierCompared to original part ME-40High quality HEPA filter captures 99.97% of airborne particles down to 0.3 microns. Activated charcoal filter can trap big particle such as hair, dust. It also removes any unfavorable household odorApprox dimension: 17.25" x 8" x 2". Suggest to replace every year to optimize the performance4 Filters included. 100% customer satisfaction guaranteed. Quality meets or exceeds leading national brand