Venting Microwave Through Roof

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Venting microwave through roof.

I would like to use that path to vent a new microwave. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. I have a range that is located against an outside brick wall in a one story kitchen with a flat roof. But an alternative worth considering if it does not make the vent run too long is to vent across the attic floor and down and out through a soffit or out through a gable end wall.

I want to vent to the outside. It appears when this house was built provision was made for venting out the rear of the microwave into the standard 2 4 wall up the cavity inside the wall then up through duct work in the attic through the roof. The duct must be the sizes listed above for proper draw of air. The old microwave did not.

Microwaves are shipped from the factory to vent out the top vertically but can also be vented out the rear horizontally. The top vented microwave example given assumes that the vent runs straight up through the roof see the roof cap in the sketch above. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Microwaves cannot be ducted into a common duct work.

This product is intended to vent an appliance through a asphalt shingle roof. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. How to vent a range hood through the roof kitchen range hood vented through roof. Both smaller and larger vents than recommended decrease venting performance.