Microwaved foods often generate grease within the appliance. That said, range hoods and over-the-range microwaves are commonly equipped with grease filters that trap grease, smoke and other pollutants and circulate out clean air. This microwave filter has a metal pull D-ring tab attached that makes replacing the filter simple. Please ensure the above dimensions match your existing filter before purchasing this oven filter. Also make sure your microwave does not require two filters, as some do.