American Dryer Corp. SL20 Installation Manual download pdf (Page 8)

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Multiple Dryer (Common) Venting

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 45°

in the direction of the flow and should be spaced at least

27-inches (68.58 cm) apart.

Important

When exhausted into a multiple (common) exhaust

line, a back draft damper must be installed at each

dryer duct.

No more than four (4) dryers should be connected to one (1)

main common duct.

The main duct may be any shape or cross-sectional area, as

long as the minimum cross section area is provided. The

illustration above shows the minimum cross section area

for multiple dryer round or square venting. These figures

must be increased 10 square inches (64.52 square

centimeters) when rectangular main ducting is used, and

the ratio of duct width to depth should not be greater than

3-1/2 to 1. In calculating ductwork size, the cross-sectional

area of a square or rectangular duct must be increased twenty

percent (20%) for each additional 20 feet (6.09 meters). The

diameter of a round exhaust must be increased ten percent

(10%) for each additional 20 feet (6.09 meters). Each

additional 90° elbow is equivalent to an additional 20 feet

(6.1 meters) and each 45° elbow is equivalent to an additional

10 feet (3.0 meters).

Warning

Dryer must never be operated without the lint filter/

screen in place, even if an external lint collection

system is used.

Important

It is recommended that exhaust or booster fans not

be used in the exhaust ductwork system.

Electrical Information _________________

Electrical Requirements

It is your responsibility to have all electrical connections made

by a properly licensed and competent electrician to ensure

that the electrical installation is adequate and conforms to

local and state regulations or codes. In the absence of such

codes, all electrical connections, materials, and

workmanship must conform to the applicable requirements

of the National Electrical Code ANSI/NFPA NO. 70-LATEST

EDITION or in Canada, the Canadian Electrical Codes Parts

1 & 2 CSA C22.1-1990 or LATEST EDITION.

Horizontal Single Dryer Venting

4-inch (10.16 cm) Ducting

Vertical Single Dryer Venting

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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American Dryer Corp. SL20 Installation Manual Page 8

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