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The grease filter resides on the bottom of the microwave. The user manual that came with your microwave has instructions on how to replace this filter! This original Whirlpool Microwave Grease Filter originally shipped with the following Whirlpool devices: MH1150XMB4, MH1150XMQ0, MH1150XMQ1, MH1150XMQ2 This is a true Whirlpool part! This item is NEW! Don't see your model number? Send us a message as we are happy to help!