... Descriptions:Mini-HEPA The HEPA cartridge traps particles as small as 0.3 microns like allergens, pollens, dust, ... purifiers are commonly used in hospitals. As contaminated air is passed through intense ultraviolet light in the ... renders them harmless and unable to reproduce.The Air Cleaning Stages: 1st stage starts with Cotton ... months, Photocatalytic: 12 months.·MOQ: 500pcs. small air purifier