Outside Ductwork Protection, Single Dryer Venting

Outside Ductwork Protection

To protect the outside end of the horizontal ductwork from the weather, a 90° elbow bent downward should be installed where the exhaust exits the building. If the ductwork travels vertically up through the roof, it should be protected from the weather by using a 180° turn to point the opening downward. In either case, allow at least twice the diameter of the duct between the duct opening and the nearest obstruction (refer to the diagram).

Important

!Do not use screens, louvers, or caps on the outside opening of the exhaust ductwork.

Single Dryer Venting

Important

!For extended ductwork runs, the cross-sectional area of the ductwork can only be increased to an

extent. When the ductwork approaches the maximum limits as noted in this manual, a professional HVAC firm should be consulted for proper venting information.

A = 12 feet (3.66 meters)	B = 8-inches (20.32 cm)

NOTE 1 Opening from combustible materials must be 2-inches (5.08 cm) larger than the duct (all the way around). The duct must be centered within this opening.

NOTE 2 Distance should be 2 times the diameter of the duct to the nearest obstruction.

The length of the ductwork from the dryer to the outside exhaust outlet, must not exceed 12 feet (3.66 meters). The minimum diameter of this ductwork must be at least 8-inches (20.32 cm) even though the dryer exhaust duct connection is smaller. Including tumbler/dryer elbow connections or elbows used for outside protection from the weather, no more than four 90° elbows should be used in the exhaust duct run. If more than the equivalent of four 90° elbows are used, the cross-sectional area of the ductwork must be increased.

Multiple Dryer (Common) Venting

Important

!For extended ductwork runs, the cross-sectional area of the ductwork can only be increased to an

extent. When the ductwork approaches the maximum limits as noted in this manual, a professional HVAC firm should be consulted for proper venting information.

If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers may be channeled into a “common main duct.” The individual ducts should enter the bottom or side of the main duct at an angle not more than 45º in the direction of airflow. The main duct should be tapered, with the diameter increasing before each individual duct is added. The minimum diameter of the individual ductwork must be at least 8-inches (20.32 cm).

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Maytag Co.

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