Compatible HRFK2 Honeywell HRF-K2 Household Odor & Gas Reducing Pre-filter (Filter K) - 2 Pack - For Air Purifier by Complete Filtration Services (CFS) Compatible HRFK2 Honeywell HRF-K2 Household Odor & Gas Reducing Pre-filter (Filter K) - 2 Pack - For Air Purifier by Complete Filtration Services (CFS) 2 Pack of Aftermarket HRF-K2 Replacement carbon filters 20.5" x 5.75" Deodorizes the air, reducing odors with activated carbon Captures large particles such as dust, lint, fibers & pet fur, maximizing the HEPA filter life. Aftermarket filters made in the USA