FILTER-MONSTER branded replacement filter compatible with Austin Air Bedroom Machin FR402 Air Purifier filter. True HEPA filtration removes up to 99.97% of airborne particles as small as 0.3 microns in size including dust， smoke， pollen， pet hair and dander， mold spores and dust mites. Carbon pre-filter reduces common household odors from cooking and cleaning， as well as extend the life of the HEPA filter by capturing larger particles before reaching HEPA filter. Recommended to change HEPA filter once every five (5) years for maximum efficiency， or more often in harsh environments. Package contains one (1) HEPA filter and two (2) carbon pre-filters. Engineered to fit Austin Air Healthmate (HM402) Air Purifier. Also fits Austin Air models HM410， HM405， HM400， HM450.

FILTER-MONSTER branded replacement compatible with Austin air bedroom machine FR402 air purifier filter， fits Austin air models HM402， HM410， HM405， HM400， HM450

True HEPA filtration removes up to 99.97% of airborne particles as small as 0.3 microns in size including dust， smoke， pollen， pet hair and dander， mold spores and dust mites

Recommended to change filter once every five (5) years under normal conditions， and more often under harsh air conditions

Package contains (1) HEPA filter， two (2) pre-filters

Approximate dimensions - diameter: 13.5 in.， inner diameter: 7.25 in.， height: 14.5 in.