The Grease Filter is an OEM part for Frigidaire microwaves. This filter traps grease and other particles released during cooking, preventing them from accumulating on internal components and ensuring proper ventilation. Over time, grease filters can become clogged or saturated with grease and other residues, reducing their effectiveness.  Symptoms of a bad grease filter include: Excessive smoke or odors during cooking Reduced airflow or ventilation Grease buildup on microwave surfaces Poor performance in removing cooking fumes This OEM Frigidaire part is also compatible with Electrolux, Gibson, Kelvinator and some Kenmore models.5304509444 (AP6230599) replaces 5304478913, 4546226, PS12071287.