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15
DRYER VENTING REQUIREMENTSDRYER VENTING REQUIREMENTS
The outside end of main vent should have a sweep elbow directed
downward.
If main vent travels vertically through the roof, rather than
through wall, install a 180° sweep elbow on end of vent at
least 2 ft (610 mm) above surface of roof.
The opening in wall or roof shall have a diameter 1⁄2" (13 mm)
larger than vent diameter. Vent should be centered in opening.
Do not install screening over end of vent for best performance.
12" minimum
(305 mm)*
A main vent can be used for venting a group of dryers. The main
vent should be sized to remove 5,663 L/min (200 CFM) of air per
dryer. Large-capacity lint screens of proper design may be used in
main vent if checked and cleaned frequently. The room where the
dryers are located should have make-up air equal to or greater than
CFM of all the dryers in the room.
If an Exhaust Hood Cannot be Used
Multiple Dryer Venting
24" minimum
(610 mm)
* Minimum clearance above any
accumulation of snow, ice, or
debris such as leaves
30˚ maximum
Air ow
Air Flow
Back-draft dampers are available from your distributor and should
be installed in the vent of each dryer to keep exhausted air from
returning into dryers and to keep exhaust in balance within main
vent. Unobstructed return air openings are required.
Each single-load dryer should have an unobstructed outdoor
air opening of 24 in
2
(154 cm
2
) (based on 1 in
2
[6.5 cm
2
] per
1,000 B.T.U [252 kcal]), common make-up air openings are
also acceptable. Set up common openings so the make-up air
is distributed equally to all of the dryers. Keep in mind that the
coverage area must be increased by 33% to account for the use
of registers or louvers over the openings. Also, make-up air
openings should not be installed near the location where exhaust
vents exit the building.
Each vent should enter the main vent at an angle pointing in
the direction of the airflow. Vents entering from the opposite side
should be staggered to reduce the exhausted air from interfering
with the other vents.
The maximum angle of each vent entering the main vent should not
be more than 30°.
Keep air openings free of dry cleaning fluid fumes. Fumes create
acids which, when drawn through the dryer heating units, can
damage dryers and items being dried.
A clean-out cover should be located on the main vent for periodic
cleaning of the vent system.
NOTE: For more dryer venting information, please refer to
Whirlpool document W10100920.
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