Maytag MDE28PD Installation Instructions Manual page 12

If an Exhaust Hood Cannot Be Used
The outside end of main vent should have a sweep elbow
directed downward.
minimum
* Minimum clearance above
any accumulation of snow,
ice, or debris such as leaves
If main vent travels vertically through the roof, rather than
through wall, install a 180° sweep elbow on end of vent at least
610 mm (2 ft) above surface of roof.
The opening in wall or roof shall have a diameter 13 mm (1⁄2")
larger than vent diameter. Vent should be centered in opening.
Do not install screening over end of vent for best performance.
Multiple Dryer Venting
A main vent can be used for venting a group of dryers. The
main vent should be sized to remove 5,663 L/minute (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.
12
minimum
VENTING REQUIREMENTS
A Back-draft Damper Kit 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.
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.
Air ow
The maximum angle of each vent entering the main vent should
be no 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.
30˚ maximum