OEM Kaz HRF-F1 replacement filter designed to help remove 99.97% of particles, including pollen, pet dander, dust, smoke, and mold spores. This filter is compatible with multiple Honeywell Air Purifiers, including models 11520, 12520, 13520, 17200, and 18150, as well as 17400, 50150, 50200, 50250, and 50300. It only requires replacement every 3 to 5 years, making it a low-maintenance option for maintaining air quality.