Vertical Venting

When vertical single 10-inch (25.4 cm) venting is used (refer to Illus. B below), the ductwork from the dryer to the outside outlet cannot exceed 60 feet (18.28 meters), refer to Illus. B below. This calculation compensates for the use of a maximum of three (3) elbows including the two (2) elbows creating the 180° (turned downward) outside outlet.

Illus. B

Illus. C

IMPORTANT:

!No more than eight (8) dryers maximum should be connected to one (1) main common duct with a vertical run.

If the length of the duct run or quantity of elbows used exceeds the above noted specifications, the cross section area of the ductwork must be increased in proportion to the number of elbows or duct run added.

IMPORTANT:

!For extended ductwork runs, the cross section area of the duct can only be increased to an extent. For extended ductwork runs, a professional heating, ventilating, and air-conditioning (HVAC) firm should be consulted for proper venting information.

MULTIPLE DRYER (COMMON) VENTING

If it is not feasible to provide separate exhaust ducts for each dryer, ducts for individual dryers may be channeled into a common main duct. Each dryer is provided with a back draft damper. The individual ducts should enter the bottom or side of the main duct at an angle not more than 45° in the direction of the airflow.

The main common duct may be any shape provided that the minimum cross-sectional area is maintained. The main duct should be tapered with the diameter increasing before each individual 8-inch (20.32 cm) duct is added (refer to Illus. C below).

NOTE:

!Distance between dryer single ducts being connected to the main common duct must be a minimum of 31-3/8” (79.69 cm) dryer width.

Ductwork should be laid out in such a manner where allowances are made at rear area of the dryer for removal of rear service panels or guards.

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