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C. EXHAUST REQUIREMENTS
NOTE: For 1 door AD-410 dryer models, the 28-inch (71.12 cm) diameter exhaust duct exits
from the rear of the base. For 2 door AD-410 dryer models, the 28-inch (71.12 cm)
diameter exhaust duct exits from the left hand side of the base.
NOTE: For 1 door/2-way tilt AD-410 dryer models, keep the exhaust ducting at least 36-inches
(91.44 cm) away from the back of the dryer so that the dryer will not hit the ducting
when the dryer tilts to the rear.
1. General Exhaust Duct Work Information
a. Gas Models
Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct
work will create excessive back pressure which results in slow drying, increased use of energy, overheating
of the dryer, and shut down of the burner by the airflow (sail) switches, burner hi-limits, or tumbler
(basket) hi-heat thermostats.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
NOTE: When a dryer is exhausted separately, it is recommended that a back draft damper be
installed.
1) Horizontal Venting
The duct work should be laid out in such a way that the duct work travels as directly as possible to
the outdoors with as few turns as possible. Single or independent dryer venting is recommended.
The shape of the duct work is not critical so long as the minimum cross-sectional area is provided. It
is suggested that the use of 90º turns in ducting be avoided; use 30º and/or 45º angles instead. The
radius of the elbows should preferably be 1-1/2 times the diameter of the duct.
The dryer comes with a 28-inch (71.12 cm) diameter exhaust duct connection. The plant’s exhaust
duct must be at least 28-inches (71.12 cm) in diameter or for a rectangular duct have a cross-
sectional area of 616 square inches (3,974 square centimeters). The duct work from the dryer to the
outside exhaust outlet should not exceed 20 feet (6.09 meters). The shape of the duct work is not
critical so long as the minimum cross-sectional area is provided. It is suggested that the use of 90º
turns be avoided; use 45º angles instead. The radius of the elbows should preferably be 1-1/2 times
the width or diameter of the duct. Excluding tumbler (basket)/dryer elbow connections or elbows
used for outside protection from the weather, no more than one (1) elbow should be used in the
exhaust duct run. If more than one (1) elbow is used, the cross-sectional area of the duct work must
be increased.
IMPORTANT: Minimum duct size for a horizontal run must be 28-inches (71.12 cm) for a
round or 25” x 26” (63.5 cm x 66.04 cm) for a square duct. Duct size must not
be reduced anywhere downstream of the dryer.