I want to vent to the outside.
Venting microwave through attic.
I would like to use that path to vent a new microwave.
If your over the range microwave oven is equipped with an interior recirculating vent the built in charcoal filter loses efficiency.
The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
The vent should be vented outside not into the attic.
You would need to know what your local codes call for to use an existing chimney.
If round ducting also note the following.
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The top vented microwave example given assumes that the vent runs straight up through the roof see the roof cap in the sketch above.
Whirlpool microwave vent hood installation model wmh73521cs duration.
Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.
The old microwave did not.
Also the plumbing vents should also go through the roof.
The make roof vents that accept the vent lines from the microwave.
Both smaller and larger vents than recommended decrease venting performance.
Microwaves cannot be ducted into a common duct work.
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.
How to vent a bath fan through the roof this old house duration.
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.
Vent your bath and kitchen exhaust fans through the roof through a special roof hood.
A rectangular to round transition adapter must be used.
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.