Venting Microwave Through Roof

Microwaves cannot be ducted into a common duct work.
Venting microwave through roof. If you have any other inquiries about our master flow products please call technical services at 800 211 9612. You would need to know what your local codes call for to use an existing chimney. The duct must be the sizes listed above for proper draw of air. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.
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. Both smaller and larger vents than recommended decrease venting performance. 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.
I would like to use that path to vent a new microwave. 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 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. Builder s best 084633 galvanized steel roof vent cap with removable screen damper 6 diameter collar black 4 7 out of 5 stars 702 22 16 22. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. How to vent a range hood through the roof kitchen range hood vented through roof.