Maytag Commercial MLG45 Installation Manual page 7

The ductwork 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. Single or independent dryer venting
is recommended. It is suggested that the use of 90° turns
be avoided; use 30° and/or 45° bends instead. The radius
of the elbows should preferably be 1 1/2 times the diameter
of the duct. All ductwork should be smooth inside with no
projections from sheet metal screws or other obstructions,
which will collect lint. When adding ducts, overlap the duct
being 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.
IMPORTANT: Exhaust back pressure measured by a
manometer/magnehelic in the exhaust duct must be no less
than 0 and must not exceed 0.3 in WC (0.75 mb).
NOTE: It is recommended that exhaust or booster fans not be
used in the exhaust ductwork system except where necessary
to maintain exhaust back pressure (in the exhaust duct)
between zero and 0.3" water column. Where employed, booster
fans must not activate the dryer airflow proving switch (sail
switch) when the dryer is not in operation.
NOTE: When the exhaust ductwork passes through a wall,
ceiling, or roof made of combustible materials, the opening
must be 2" (5.08 cm) larger than the duct (all the way around).
The duct must be centered within this opening.
The ductwork for this dryer must be suitable for the appliance
category in accordance with national installation regulations of
the country of destination.
Outside Ductwork Protection
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 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 the nearest obstruction (refer to the diagram).
IMPORTANT: Do not use screens, louvers, or caps on the
outside opening of the exhaust ductwork.
Single Dryer Venting with Transition Piece
HORIZONTAL DUCTING
TRANSITION
PIECE
A = 20' (6.10 m)
B = 10" (25.4 cm)
DIMENSION A
NOTE 1
DIMENSION B
NOTE 2
WALL
VERTICAL DUCTING
NOTE 2
ROOF
A = 20' (6.10 m)
B = 10" (25.4 cm)
NOTE 1 Opening from combustible materials must be
2" (5.08 cm) larger than the duct (all the way around).
The duct must be centered within this opening.
NOTE 2 Distance should be two times the diameter of the duct
to the nearest obstruction.
Single Dryer Venting without Transition Piece
HORIZONTAL DUCTING
DIMENSION A
A = 20' (6.10 m)
B = 8" (20.32 cm)
NOTE 1
DIMENSION A
DIMENSION B
TRANSITION
PIECE
NOTE 1
DIMENSION B
NOTE 2
WALL
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