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17
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" min.
(305 mm)*
A main vent can be used for venting a group of dryers. The main
vent should be sized to remove 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.
Back-draft Damper Kit, Part No. 3391910, is 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.
If an Exhaust Hood Cannot be Used
Multiple Dryer Venting
DRYER VENTING REQUIREMENTS
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 be
no more than 30°.
24" min.
(610 mm)
30˚ max.
Air ow
* Minimum clearance above any
accumulation of snow, ice, or
debris such as leaves
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