Clothes Dryer

Detail ID
6.0202.1
Topic
Local Ventilation
SubTopic
Appliance Exhaust
Desired Outcome

Dryer vented to outdoors safely and effectively

SF Single Family Site-Built Housing
MH Manufactured Housing
MF Multifamily Housing

Specifications

  • SF
  • MH
  • MF
Specification Objective

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

Smooth airflow that does not collect lint

  • SF
  • MH
  • MF
Specification Objective

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"

Dryer ducted to outdoors durably and effectively

  • SF
  • MH
  • MF
Specification Objective

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

Safe and airtight lint collection

  • SF
  • MH
  • MF
Specification Objective

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

Securely fastened without obstructing flow

  • SF
  • MH
  • MF
Specification Objective

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

Safe operation of combustion appliances

  • SF
  • MH
  • MF
Specification Objective

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

Prevent condensation

  • SF
  • MH
  • MF
Specification Objective

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

Termination may not contain a pest screen

Dryer termination that is effective, safe and does not inhibit flow

  • SF
  • MH
  • MF
Specification Objective

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

Airtight ducts

  • SF
  • MH
  • MF
Specification Objective

Plumb condensing dryers to a drain

Condensate properly disposed

View Sub-Topic:
Appliance Exhaust