6.6005.1 Clothes Dryer

Topic: 
Exhaust
Subtopic: 
Appliance Exhaust Vents
Desired Outcome: 
Dryer air exhausted efficiently and safely
TitleSpecification(s)Objective(s)
6.6005.1a
Clothes dryer ducting

Clothes dryers will be ducted to the outdoors, which does not include unconditioned spaces such as attics and crawl spaces that are ventilated with the outdoors

As short a run as practical of rigid sheet metal or semi-rigid sheet metal venting material will be used in accordance with manufacturer specifications

Dryer ducts exceeding 35' in duct equivalent length will have a dryer booster fan installed

Plastic venting material will not be used

Uninsulated clothes dryer duct will not pass through unconditioned spaces such as attics and crawl spaces, except where allowed by the authority having jurisdiction

Ducts will be connected and sealed as follows:

  • UL UL Underwriters Laboratories listed foil type or semi-rigid sheet metal to rigid metal will be fastened with clamp
  • Other specialized duct fittings will be fastened in accordance with manufacturer specifications
  • In addition to mechanical fasteners, duct connections will be sealed with UL UL Underwriters Laboratories 181B or 181B-M listed material

In addition:

  • Sheet metal screws or other fasteners that will obstruct the exhaust flow will not be used
  • Condensing dryers will be plumbed to a drain

Preserve integrity of building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

Effectively move air from clothes dryer to outside

6.6005.1b
Termination fitting

Termination fitting manufactured for use with dryers will be installed

A backdraft damper Backdraft damper A damper that allows air to flow in only one direction will be included, as described in termination fitting detail

Preserve integrity of building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

Effectively move air from clothes dryer to outside

6.6005.1c
Make-up air

If natural draft combustion appliances are present and if worst-case CAZ CAZ Combustion appliance zone and/or other performance based testing is conducted and indicates a need for make-up air, make-up air will be provided in accordance with the current version of ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 62.2 and in compliance with the authority having jurisdiction.  

If  natural draft combustion appliances are present and if no performance based testing is conducted, make-up air will be provided prescriptively in accordance with the current version of ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 62.2 and in compliance with the authority having jurisdiction.

Preserve integrity of building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

Effectively move air from clothes dryer to outside

6.6005.1d
Combustion safety

Pressure effects caused by fans will be assessed and corrected when found outside of combustion safety standards

Ensure safe operation of combustion appliances

Ensure occupant health and safety

6.6005.1e
Occupant education

Occupant will be instructed to keep lint filter and termination fitting clean

Occupant will be instructed to keep dryer booster fan clean, if present

Occupant will be instructed on clothes dryer operation safety including information on items that must not be placed in the clothes dryer (items with any oil or other flammable liquid on it, foam, rubber, plastic or other heat-sensitive fabric, glass fiber materials)

Effectively move air from clothes dryer to outside

TitleSpecification(s)Objective(s)
6.6005.1a
Clothes dryer ducting

Clothes dryers will be ducted to the outdoors, which does not include unconditioned spaces, such as attics and crawl spaces that are ventilated with the outdoors

As short a run as practical of rigid sheet metal or semi-rigid sheet metal venting material will be used in accordance with manufacturer specifications

Dryer ducts exceeding 35' in duct equivalent length will have a dryer booster fan installed

Plastic venting material will not be used

Uninsulated clothes dryer duct will not pass through unconditioned spaces, such as attics and crawl spaces, except where allowed by the authority having jurisdiction

Ducts will be connected and sealed as follows:

  • UL UL Underwriters Laboratories -listed foil type or semi-rigid sheet metal to rigid metal will be fastened with clamp
  • Other specialized duct fittings will be fastened in accordance with manufacturer specifications
  • In addition to mechanical fasteners, duct connections will be sealed with UL UL Underwriters Laboratories 181B or 181B-M listed material

In addition,

  • Sheet metal screws or other fasteners that will obstruct the exhaust flow will not be used
  • Condensing dryers will be plumbed to a drain

Preserve integrity of building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

Effectively move air from clothes dryer to outside

6.6005.1b
Termination fitting

Termination fitting manufactured for use with dryers will be installed

A backdraft damper Backdraft damper A damper that allows air to flow in only one direction will be included, as described in termination fitting detail

Preserve integrity of building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

Effectively move air from clothes dryer to outside

6.6005.1c
Makeup air

If natural draft combustion appliances are present and if worst-case CAZ and/or other performance based testing is conducted and indicates a need for make-up air, make-up air will be provided in accordance with the current version of ASHRAE 62.2 and in compliance with the authority having jurisdiction.  

If  natural draft combustion appliances are present and if no performance based testing is conducted, make-up air will be provided prescriptively in accordance with the current version of ASHRAE 62.2 and in compliance with the authority having jurisdiction.

Preserve integrity of building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

Effectively move air from clothes dryer to outside

6.6005.1d
Combustion safety

Pressure effects caused by fans will be assessed and corrected when found outside of combustion safety standards

Ensure safe operation of combustion appliances

Ensure occupant health and safety

6.6005.1e
Occupant education

Occupant will be instructed to keep lint filter and termination fitting clean

Occupant will be instructed to keep dryer booster fan clean, if present

Occupant will be instructed on clothes dryer operation safety, including information on items that must not be placed in the clothes dryer (items with any oil or other flammable liquid on it, foam, rubber, plastic or other heat-sensitive fabric, glass fiber materials)

Effectively move air from clothes dryer to outside