Quote:
Originally Posted by EdFNJ
Better off with a separate range hood from the ceiling above stove and microwave. If microwave eventually dies you will have to reroute the ductwork and if you do duct it you will lose the cabinet it's attached to. The microwave itself doesn't need a duct, it's the stove/oven under it. Microwaves are sealed. The "exhaust" fan that is part of the microwave doesn't exhaust the microwave itself it's basically just an air filter. This is all assuming you are referring to the "standard" (GE?) microwave they hang under the cabinet over the stove.
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This isn't true.
I recently replaced my over-the-range microwave - Whirlpool, new in 2011. The opening for a duct to the rooftop exhaust vent is inside the wall behind the microwave.
The replacement Whirlpool microwave is not "sealed." There is a plate on the back of the microwave, located where the microwave meets the opening. Remove the plate and the microwave exhaust fan blows upward through the roof vent. If there is no roof vent, the plate is left in place and the exhaust fan blows into the kitchen.