range hood venting
Yup, a damper required by M1502.1: "Range hoods shall discharge to the outdoors through a single-wall duct. The duct serving the hood shall have a smooth interior surface, shall be air tight and shall be equipped with a backdraft damper...."
Originally Posted by Bob Mariani
use an inline damper for this, not the roof cap. The cap should have an insect screen also.
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