Maytag Commercial MLG45 Installation Manual page 8

VERTICAL DUCTING
NOTE 2
ROOF
A = 20' (6.10 m)
B = 8" (20.32 cm)
The length of the ductwork from the dryer to the outside
exhaust outlet must not exceed 20' (6.09 m). The minimum
diameter of this ductwork must be at least 8" (20.32 cm) when
each pocket/tumbler is vented individually and 10" (25.4 cm)
when both pockets/tumblers are combined. Including tumbler/
dryer elbow connections or elbows used for outside protection
from the weather, no more than two 90° elbows should be used
in the exhaust duct run. If the length of the duct run or quantity
of elbows used exceeds the above noted specifications, the
cross-sectional area of the ductwork may need to be increased.
IMPORTANT: For extended ductwork runs, the crosssectional
area of the ductwork can only be increased to an extent. When
the ductwork approaches the maximum limits as noted in this
manual, a professional HVAC firm should be consulted for
proper venting information.
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 45º
in the direction of airflow. The main duct should be tapered,
with the diameter increasing before each individual duct is
added. The minimum diameter of the individual ductwork must
be at least 8" (20.32 cm) for individual pockets/tumblers or
10" (25.4 cm) for individual dryers.
IMPORTANT: To maintain proper performance, no more than
four dryers should be connected to one main common duct.
The main duct may be any shape provided that the minimum
cross-sectional area is maintained. The illustrations that follow
show the minimum cross-sectional area for multiple dryer round
or square venting. These figures must be increased if the main
duct run from the last dryer to where it exhausts to the outdoors
is longer than 20' (6.09 m) or has more than one elbow in it.
IMPORTANT: For extended ductwork runs, the crosssectional
area of the ductwork can only be increased to an extent. When
the ductwork approaches the maximum limits as noted in this
manual, a professional HVAC firm should be consulted for
proper venting information.
8
NOTE 1
DIMENSION A
DIMENSION B
Multiple Dryer Venting with 10" (25.4 cm) Diameter
1200 cfm (33.98 cmm) Exhaust Connections at Common Duct
NUMBER OF DRYERS
SQ IN
MINIMUM CROSS-
SECTIONAL AREA
SQ CM
IN
MINIMUM ROUND
DUCT DIAMETER
CM
NO. OF DRYERS
A = 10" (25.4 cm) B = 20' (6.09 meters)
NOTE 1
DIMENSION B
TO INDIVIDUAL
WALL
NOTE 2
TUMBLER EXHAUST MUST ENTER MAIN
EXHAUST DUCT AT A 45° ANGLE
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 2 times the diameter of the duct to
the nearest obstruction.
Multiple Dryer Venting with 8" (20.32 cm) Diameter 600 cfm
(16.99 cmm) Exhaust Connections at Common Duct
NUMBER OF DRYERS
SQ IN
MINIMUM CROSS-
SECTIONAL AREA
SQ CM
IN
MINIMUM ROUND
DUCT DIAMETER
CM
NO. OF DRYERS
NOTE 1
DIMENSION B
TO INDIVIDUAL
POCKETS/TUMBLERS
WALL
NOTE 2
TUMBLER EXHAUST MUST ENTER MAIN
EXHAUST DUCT AT A 45° ANGLE
A = 8" (20.32 cm) B = 20' (6.09 m)
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 2 times the diameter of the duct to
the nearest obstruction.
FORMULAS TO CALCULATE DUCTING CROSS SECTIONAL AREA
CROSS SECTIONAL AREA
OF A ROUND DUCT = .785 (19.939 mm) x D
WHERE D = DIAMETER OF THE DUCT.
CROSS SECTIONAL AREA
OF A RECTANGULAR DUCT = W x H
WHERE W = WIDTH AND H = HEIGHT.
4 3 2
254 200 155
1638 1290 999
18 16 14
45.72 40.64 35.56
4 3 2 1
DRAWERS
DIMENSION A
INSPECTION
DOORS
8 7 6 5 4 3
254 200 155
1638 1290 999
18 16 14
45.72 40.64 35.56
8 7 6 5 4 3
DIMENSION A
INSPECTION DOORS
2
1
80
516
10
25.4
2 1
80
516
10
25.4
2 1
D
H
W