501 Replacement Filter for 5000 Whole-House Air Purifier – MERV 15 Equivalent,
Removal efficiency: 89% 0.3-1 micron, 95% 1-3 microns, and 98% 3-10 microns. For help with allergy and asthma triggers during allergy season and beyond, trust the AprilAire 501 Healthy Air 15 Filter.