Sometimes rinsing it off isn’t enough and the air and grease filter on your microwave needs to be replaced in order to keep grease out of the microwave venting system. This filter collects grease particles from the air while you are cooking This is a replacement grease filter also known as a grease air filter or a range hood air filter. The GE WB06X10309 Microwave Grease Filter Assembly fits various GE and Hotpoint oven range hoods, countertop microwave ovens and over the range microwave ovens.