The OEM Kaz HRF-D1 Permanent Replacement Filter is designed to help remove 99.97% of airborne particles, including household dust, smoke, pollen, mold spores, and pet dander. This filter is compatible with Honeywell Air Purifiers 5010, 10500, 17000, 17005, and 10590. It protects against air leakage around the filter to ensure maximum efficiency and can be stacked for use with larger models. Replacement is only necessary every 3 to 5 years.