Replacement HRF-APP1 PreFilter for Honeywell - Compatible with Honeywell HPA300, Honeywell 50250, Honeywell HPA200, Honeywell 17000, Honeywell 50150, Honeywell HPA100, Honeywell 18155 Replacement HRF-APP1 Filter for Honeywell HPA300, Honeywell 50250, Honeywell HPA200, Honeywell 17000, Honeywell 50150, Honeywell HPA100, Honeywell 18155, Honeywell HA200, Honeywell 38002, Honeywell 50300, Honeywell 17005, Honeywell 13520, Honeywell HRF-APP1, Honeywell 5250, Honeywell 53000, Honeywell 50100, Honeywell 18150, Honeywell 17450, Honeywell 11520, Honeywell HA300, Honeywell 10500, Honeywell F115, Honeywell 83332, Honeywell 83331, Honeywell 64500, Honeywell 63500 Replaces Honeywell HRF-APP1 PreFilter Can be cut to make 1-8 pre-filters depending on model. Filters large particles such as dust, lint, fibers & pet fur. For best results, change air filter at least once per season or more often depending on air quality and use. Essential for Allergy Sufferers. On Sale for a Limited Time!