The Grease Filter is an OEM part for Samsung microwaves. It is located above the microwave cavity and functions to capture grease and odors produced during cooking. The specialized filter material traps these airborne particles before they enter the ventilation ductwork. Causes of a bad grease filter can include clogs from the accumulation of grease residue over time. Natural degradation may also diminish the filter's effectiveness. Symptoms of a bad Microwave Grease Filter include: Reduced airflow and increased inner temperatures during cooking Strong cooking odors escaping from the ventilation openings A filter that has lost its ability to entrap grease and remove odors Potential residue buildup inside the microwave housing and ducting This OEM Samsung part is also compatible with some Kenmore models.DE63-00196A (AP4221824) replaces 2080534, DE63-00196B, PS4228058.