The Charcoal Filter is an OEM part for Whirlpool microwaves. It is designed to remove odors and impurities from the air that circulates through the microwave during cooking.  The filter measures about 7 inches wide by 6-1/2 inches deep. Causes of a bad charcoal filter can include prolonged use without replacement, accumulation of grease and food particles, or damage due to cleaning with harsh chemicals or abrasives. Symptoms of a bad charcoal filter include: Reduced effectiveness in odor removal Excessive smoke or steam during cooking Unusual or unpleasant smells persisting in the kitchen Discoloration or visible debris on the filter This OEM Whirlpool part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper and some Kenmore models.8206444A (AP4299930) replaces 1266736, 8184958, 8184958A, 8206444, PS1871370.