Broan-Nutone? Genuine Replacement Charcoal Filter For Range Hoods, 10-7/8" X 10-1/2", Fits Select Models Keep Your Range Hood Operating At Peak Performance With The Hpfx1 Charcoal Filter. This Filter Is Used In Ductless Applications To Capture Grease And Odors Generated From Cooking. Replace Your Filter Every 6 Months, Or More Often If Your Cooking Style Generates Extra Grease.