It sounds like the microwave is being vented through the vents on the top front part of the microwave. You should be able to feel the vented air coming out of the top front part of the microwave. Also, there is a removable metal mesh filter that can be removed, cleaned, and replaced. Is it possible that the filter is missing or very dirty? Another option is to attach a plastic diverter on top of the microwave behind the vent to divert the greasy air away from the cabinets. In any event, the inside vented microwave is not a good situation, but I believe it does comply with the code.
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