American Dryer Corp. AD-385 - Manual (Page 21)

NOTE; Distance between dryer single ducts being connected to the main common duct must be
a minimum of 28-1/2" (dryer width).
Duct work should be laid out in such in a manner where allowances are made at rear area
of dryer for removal of rear service panels/guards.
Illustration D (refer to page 16) shows the minimum cross-section area for 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.
IMPORTANT: For extended duct work runs, the cross section area of the duct work can
only be increased to an extent. When the duct work approaches the maxi­
mum limits as noted in this manual, a professional HVAC firm should be
consulted for proper venting HVAC from should be consulted for proper
venting information.
IMPORTANT VENTING REMINDERS
1. Duct work size and installation should be done by a qualified professional.
2. The dryer must be exhausted to the outdoors.
3. Duct work should be routed as short as possible to the outdoors with as few elbows as possible.
4. Avoid 90° turns ... use 30° or 45° turns instead.
5. The size of the duct work must be a minimum of 10-inches if the exhaust length exceeds 10 feet.
6. The inside of the duct work should be as smooth as possible ... with no projections from sheet
metal screws.
Ducts added should overlap the duct to which it is to be connected.
7. ALL ducts should be taped to prevent moisture and lint from escaping into the building.
8. Inspection/clean out doors should be installed throughout strategic points in the duct work for
periodic inspection and cleaning.
9. Wherever the duct passes throughout combustible materials, the opening must be 2-inches larger
(all the way around) than the duct. The duct must be centered within this opening.
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