Where can a clothes dryer vent terminate and does it need a damper?
It must terminate outdoors at least 3 feet from any building opening, with a backdraft damper and no screen (IRC M1502.3).
A clothes dryer exhaust must discharge directly to the outdoors — never into an attic, crawlspace, soffit, or wall cavity. The termination point has to be at least 3 feet in any direction from any opening into the building, such as a window or door.
The outlet must be fitted with a backdraft damper to stop outside air from blowing back in. Screens are specifically prohibited at the termination because lint clogs them and creates a fire hazard.
The duct must also be independent of any other exhaust system and cannot connect into a vent, chimney, or another duct.
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Ask Donnie →General information based on the International Residential Code (a model code). This is AI assistance to verify — not legal advice. Confirm the adopted edition and any local amendments with your local building department (AHJ) and a licensed professional before you build.