This Range Hood Charcoal Filter Traps Grease From The Exhaust Air Of Your Oven To Prevent It From Entering The Blower And Vent, Potentially Causing Build-Up And Damage. If Your Current Filter Is No Longer Functioning Properly, Replacing This Accessory May Alleviate The Issue. Installing This Accessory Will Require Basic Hand Tools, Some Disassembly Of The Range Hood And Novice Repair Experience. You Must Unplug The Hood Or Shut Off The House Circuit Breaker For The Appliance Before Installing This Part. Helpful Tip: For Optimum Performance Of Your Vent, Change The Filter At Least Once Per Year Or When A Loss Of Airflow Can Be Detected.