Two Countdown Timer Modes for Auto-turn Off and On in 1 Hour / 2 Hours Mode. Certificate(s): CE, RoHS, FDA. Descriptions:Mini-HEPA The HEPA cartridge traps particles as small as 0.3 microns like allergens, pollens, dust, pet dander and more. HEPA technology has been developed by the military several years ago and is one of the most effective media to remove airborne particles. The activated ...