HRF-K2 Honeywell Household Odor and Gas Reducing Pre-filter (2-pack)The cost effectively priced 2 pack of HRF K2 Household Odor and Gas Reducing Pre filters can increase the performance of your air purifier. The HRF K2 helps trap those larger particles, like pet fur and dust, that can clog your air purifier and helps reduce harmful household volatile organic compounds and fumes. Protect your filter and your household with the HRF K2 as your first line of defense. Order your HRF K2 today!