Honeywell Genuine HRF-N2 Replacement HEPA Clean Air Purifier Filter (1 Pack (2 Filters)) Genuine Honeywell HEPA(High-efficiency Particulate Air) and low-maintenance home air cleaner Filter. FilterType N Contains 2 Filters Per Pack Captures up to 99.97% of airborne particles at 0.3 microns from the air that passes through the filter. Replace every 3 months for better performance Replacement for : Air Purifier Models:HHT-145, HHT-149, HPA-245, HPA-248, HPA-249 Air Filter Models:HRF-N2,Type N Filter