ADC AD-120ES Installation Manual page 15

IMPORTANT: For extended ductwork runs, the
cross section area of the duct can only be increased
to an extent. Maximum proportional ductwork runs
cannot exceed 20 feet (6.09 meters) more than the
original limitations of 20 feet (6.09 meters) with two
elbows. When the ductwork approaches the
maximum limits as noted in this manual, a
professional HVAC firm should be consulted for
proper venting information.
All ductwork should be smooth inside with no
projections from sheet metal screws or other
obstructions, which will collect lint. When adding
ducts, the duct to be added should overlap the duct
to which it is to be connected. All ductwork joints
must be taped to prevent moisture and lint from
escaping into the building. Inspection doors should
be installed at strategic points in the exhaust
ductwork for periodic inspection and cleaning of
lint from the ductwork.
NOTE: When the exhaust ductwork passes through
a wall, ceiling, or roof made of combustible
materials, the opening must be 2-inches (5.08 cm)
larger than the duct (all the way around). The duct
must be centered within this opening.
ADG-120DR Single Dryer Venting
When possible, it is suggested to provide a
separate exhaust duct for each dryer. The exhaust
duct should be laid out in such a way that the
ductwork travels as directly as possible to the
outdoors with as few turns as possible. It is
suggested that the use of 90° turns in ducting be
avoided; use 30° and/or 45° angles instead. The
shape of the exhaust ductwork is not critical as long
as the minimum cross section area is provided.
IMPORTANT: Minimum duct size for model
ADG-120DR dryer with not more than three elbows
(including dryer connection and outside outlets) is
12-inches (30.48 cm) for a round duct or
10-3/4" by 10-3/4" (27.30 cm by 27.30 cm) for a
square duct. Duct size must not be reduced
anywhere downstream of dryer.
Exhaust back pressure measured by a manometer
at each tumbler exhaust duct area must be no less
than 0 and must not exceed 0.3 in WC (0.75 mb,
75 Pa).
It is suggested that the ductwork from each dryer
(minimum 12-inches [30.48 cm]) not exceed the
lengths and number of elbows shown below. If the
ductwork exceeds the lengths and number of
elbows shown below, the cross section area of the
ductwork must be increased in proportion to the
length and number of elbows in it. In calculating
duct size, the cross section area of a square or
rectangular duct must be increased by twenty
percent for each additional 15 feet (4.57 meters).
The diameter of a round exhaust duct should be
increased ten percent for each additional 15 feet
(4.57 meters). Each 12-inch (30.48 cm) 90° elbow
is equivalent to 25 feet (7.62 meters).
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IMPORTANT: For extended ductwork runs, the cross section area of
the duct can only be increased to an extent. Maximum proportional
ductwork runs cannot exceed 20 feet (6.09 meters) more than the
original limitations of 20 feet (6.09 meters) with two elbows. When the
ductwork approaches the maximum limits as noted in this manual, a
professional HVAC firm should be consulted for proper venting
information.
All ductwork should be smooth inside with no projections from sheet
metal screws or other obstructions, which will collect lint. When adding
ducts, the duct to be added should overlap the duct to which it is to be
connected. All ductwork joints must be taped to prevent moisture and
lint from escaping into the building. Inspection doors should be installed
at strategic points in the exhaust ductwork for periodic inspection and
cleaning of lint from the ductwork.
NOTE: When the exhaust ductwork passes through a wall, ceiling, or
roof made of combustible materials, the opening must be 2-inches (5.08
cm) larger than the duct (all the way around). The duct must be centered
within this opening.
To protect the outside end of the horizontal ductwork from the weather,
a 90° elbow bent downward should be installed where the exhaust
exits the building. If the exhaust ductwork travels vertically up through
the roof, it should be protected from the weather by using a 180° turn
to point the opening downward. In either case, allow at least twice the
diameter of the duct between the duct opening and nearest obstruction.
IMPORTANT: Do not use screens, louvers, or caps on the outside
opening of the exhaust ductwork.
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