The Grease Filter is an OEM part for GE microwaves. It is responsible for trapping grease and other particles from the air as it circulates through the microwave's ventilation system. You should replace this grease filter if it becomes clogged, damaged, or worn out. Causes of a bad grease filter include prolonged use without cleaning, accumulation of grease and food particles, or physical damage to the filter mesh. Symptoms of a bad grease filter include: Reduced ventilation efficiency Lingering cooking odors Excessive grease buildup on surrounding surfaces This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.WB06X10288 (AP3417082) replaces 910437, AH227998, EA227998, PS227998, WB6X10288.