The exhaust fan on a number of microwave ovens is incorrectly vented. Many have the motor assembly turned (it can be rotated for either type operation) so that the air is routed upward as though it were being transmitted into a duct or vent to the exterior....
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The exhaust fan on a number of microwave ovens is incorrectly vented. Many have the motor assembly turned (it can be rotated for either type operation) so that the air is routed upward as though it were being transmitted into a duct or vent to the exterior. They ought to typically be turned so they vent back into the room (recirculate) through the metal and/or charcoal filter. If you were to feel for airflow between the top edge of the microwave oven and the cabinet above you would feel air blowing out from between them. This is wrong and needs to be corrected. Those filters should be cleaned routinely in the dishwasher to take off the built-up grease.
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