Venting Microwave Through Roof

Both smaller and larger vents than recommended decrease venting performance.

Venting microwave through 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 have a range that is located against an outside brick wall in a one story kitchen with a flat roof. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. The top vented microwave example given assumes that the vent runs straight up through the roof see the roof cap in the sketch above.

How to vent a range hood through the roof kitchen range hood vented through roof. Microwaves cannot be ducted into a common duct work. If you have any other inquiries about our master flow products please call technical services at 800 211 9612. This product is intended to vent an appliance through a asphalt shingle roof.

The duct must be the sizes listed above for proper draw of air. Microwaves are shipped from the factory to vent out the top vertically but can also be vented out the rear horizontally. I would like to use that path to vent a new microwave. 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.

You would need to know what your local codes call for to use an existing chimney. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. I want to vent to the outside. The old microwave did not.