Quote:
Originally Posted by arbajeda
There is a vent to the outside in your microwave. The fan keeps the heat from building up on the bottom.
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To clarify, on most microwave ovens, the fan will suck air through the bottom of the microwave and will discharge it through the vent holes in the top, front part of the microwave. So, you are blowing hot air toward the drywall kitchen ceiling. You may be reducing the temperature directly above the cooktop, but you are not removing any heat from the kitchen. In my opinion, this is not a good design. The builder should install a vent through the exterior wall or roof. The microwave ovens are designed to allow the fan position to be changed to discharge the air to an outside vent.