Clothes Dryer

Select dryer transition ducting materials that are UL 2158A approved and less than 8 feet in total length with no joints

Select primary dryer ducting material that is 28 gauge metal with a smooth interior

Vent all clothes dryers to the outdoors, which does not include unconditioned spaces such as attics and crawl spaces that are ventilated with the outdoors

Choose the shortest practical installation path

Install a dryer booster fan that is listed and labeled to UL 705 for dryer ducts exceeding 35' in equivalent length

Install ducts according to SWS detail for "Ventilation Ducts"

If a lint collection device is installed, it must:

be UL approved for dryers

be installed according to manufacturer specifications

be airtight when dryer is operating

Fasten all duct connections with mechanical fasteners that do not penetrate the interior of the duct (e.g., clamps, gasketed fitting)

No fastener may penetrate the interior of the duct

If the dryer operation interferes with combustion appliance operation, make-up air must be provided according to applicable code

Insulate dryer ducts installed outside of the thermal boundary to a minimum of R-8

Vent dryer through a termination manufactured for use with dryers that includes a backdraft damper

Termination may not contain a pest screen

Seal all duct connections with 181B or 181B-M listed material

Plumb condensing dryers to a drain