“I am venting outside. how do I to close the top grill? I don't want the upper cabinet to get grease.”

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• Hi - Thanks for reaching out to us and for choosing GE! The upper vents on the top of the microwave should not be blocked/restricted. A fan where the internal components are located will run continuously while the microwave is in operation to constantly circulate the air to cool the working parts so you will feel a small amount of air flow from the vent. If venting outside, the grease filters trap grease and the fan will exhaust the steam/smoke through the ducts to the outside. Cleaning the grease filters is dependent on what type of cooking is done. For normal use, filters should be cleaned once a month. View page 15 of the Owner's Manual: https://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=49-40669-6.PDF - Thanks for choosing GE. Enjoy! Sue

  Answered by GE Answers 6 years ago

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• This unit comes with a venting louver for force the air through it to the vent pipe. Should be fine.

  Answered by Murphbrau 6 years ago

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