Mechanical · IRC 2021 §M1503.3 / §M1503.4
Range Hood Duct Material and Discharge
Residential range hood duct: smooth, airtight, independent, with a backdraft damper to the outdoors; galvanized steel, stainless steel or copper, with the under-slab PVC down-draft exception.. Referenced to IRC 2021 §M1503.3 / §M1503.4.
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