LifeSupplyUSA compatible with Honeywell 21600 Air Purifier Replacement HEPA Filter 51500 61500 18150 11520 17200 11500 11525 11526 17201 17210 83330 True HEPA filter. 99.97% Effective Expected Duration: 12 Months Will also fit Sears Kenmore Air Cleaner models: 833308