The Damper is an OEM part for Frigidaire microwaves. This part regulates airflow within the microwave, ensuring that steam and odors are properly vented out during cooking. Causes of a bad damper can include wear and tear over time, buildup of grease and debris, or damage from high temperatures.   Symptoms of a bad Damper include: Poor ventilation during cooking, leading to lingering odors and steam The microwave overheating or not ventilating properly Unusual noises coming from the damper area The damper not opening or closing as it should This OEM Frigidaire part is also compatible with Electrolux, Gibson, Kelvinator and some Kenmore models.5304509486 (AP6230633) replaces 5304464119, 4547043, PS12071321.