The Charcoal Filter is an OEM replacement part for GE microwaves. It helps control odors within the microwave by filtering the air during the cooking process. As microwaves heat up food, vapors, and smells can get trapped inside. The charcoal filter works to absorb and neutralize these odors before they are released back into the air. Causes of a bad filter include exceeding the recommended replacement schedule or exposure to extremely pungent cooked foods on a regular basis. Symptoms of a charcoal filter that needs replacing include: Noticeable odors emitted from the microwave when in use or just after cooking Food taking on smells from previous meals The filter material appears exhausted or completely dark/black This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.WB02X10956 (AP3204832) replaces 1057486, AH951943, EA951943, JX81H, PS951943.