ADC AD-25 Installation Manual download pdf (Page 23)

MULTIPLE DRYER (COMMON) VENTING

HORIZONTAL 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. No more than

four (4) dryers should be connected to one (1) main common duct run.

The main common duct may be any shape so long as the minimum cross-sectional area is provided. 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 and Illus. D).

Illus. C

Horizontal venting must not exceed 20 feet (6.1 meters) - this calculation compensates for the use of a

maximum of only one (1) elbow, which is the outside outlet protection.

NOTE: Distance between dryer single ducts being connected to the main common duct must be a

minimum of 34-1/4” (86.9 cm) for the AD-25, 31-3/8” (79.69 cm) for the AD-30 and

34-1/4” (86.9 cm) for the AD-50 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.

Illus. C shows the minimum cross section area for horizontal multiple dryer venting. These figures must be

increased in proportion if the main duct run from the last dryer to where it exhausts has numerous elbows or is

unusually long.

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ADC AD-25 Installation Manual Page 23