Honeywell HPA204 True HEPA Allergen Remover, 310 sq. Ft Recommended for Large Rooms (310 sq. ft.) 4 air cleaning levels: Germ, General Clean, Allergen and Turbo Automatic shut-off  2, 4, or 8 hours. Uses pre-filter HRF-AP1 and HEPA Clean filter HRF-R1 Filters and circulates Room Air 5X per hour when used in the recommended room size, Tobacco Smoke:200, Dust:190, Pollen:180 To ensure stated product performance, use only Genuine Honeywell Replacement Filters