6.6005.3 Clothes Dryer (All Building Types)

Topic: 
Exhaust
Subtopic: 
Appliance Exhaust Vents
Desired Outcome: 
Dryer air exhausted efficiently and safely
For supporting material, see Referenced Standards.
TitleSpecification(s)Objective(s)
6.6005.3a
Pre-inspection

Specifications will be field verified as appropriate to site conditions by installer

Ensure appropriate design for installation

6.6005.3b
Clothes dryer ducting

Clothes dryers exhaust will be ducted to the outdoors

As short a run as practical of smooth wall metal duct will be used, following manufacturer specifications and the applicable code adopted by the jurisdiction

Dryer ducts exceeding the manufacturer's recommended maximum length or the maximum length specified by the applicable code adopted by the jurisdiction shall have a dryer booster fan installed, and shall have a safety interlock with the dryer(s) so they will not operate if the fan is not operating properly

When multiple dryers vent into a common plenum or stack, the system will be engineered by a design professional and installed with a terminal exhaust fan

Ducting will be connected and sealed as described in exhaust details SWS 6.6004.1 Centra/Common Exhaust Fan Serving Multiple Dwelling Units via Common Duct(s) and Dwelling Unit Branches and SWS 6.6004.2 Individual Exhaust Fan Serving Multiple Rooms Within a Single Dwelling Unit (All 3 Building Types)

Fasteners that obstruct the exhaust flow will not be used

Condensing dryers will be plumbed to a drain that leads to an approved sanitary disposal system

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 the outdoors

Meet code requirements

Remove moisture, lint, and excess heat from laundry area

6.6005.3c
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

Minimum distance of exhaust outlets installed new from any doors or operable windows or outside air intakes will meet local code requirements or specifications of ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 62.1 Table 5-1 requirements

Outlet will be sealed to prevent water and air intrusion

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 the outdoors

Direct exhaust to the outdoors and prevent re-entry

Prevent entry of weather and pests into building shell

Ensure occupant health and safety

6.6005.3d
Makeup air

When dryer(s) are installed in a single room, makeup air will be designed following the applicable code adopted by the 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 the outdoors

6.6005.3e
Verification

Visual inspection of installation and air flow out of the building will be completed

Ensure the performance of the ventilation system

Ensure occupant health and safety

6.6005.3f
Combustion zone testing

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

6.6005.3g
Occupant/property manager education

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

Effectively move air from clothes dryer to the outdoors