Green Oaks GREOAK special HEPA air purifier filter specifications antibacterial: 212x386x22 mm Features: 1, can be used 720 hours; 2, can effectively block the hair, dust, smoke, secondhand smoke, and other large particulate matter, inhibit bacteria, fungi. pm2.5 disposable purification rate of up to 99.7%, pm0.3 purification rate of up to 99.5%;