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• Main collector duct should be sized according to
specifications shown below.
NOTE: Main collector duct should be equipped with
an auxiliary fan that can maintain the duct airflow at
a minimum of 1200 feet (366 m) per minute. If you do
not have a fan, clean the main collector duct at least
twice a year.
D039IE3A
WEATHER HOOD
OR SWEEP ELBOW
(No cap or screen)
WALL
PARAPET
ROOF
180˚ SWEEP
ELBOW
(No cap
or screen)
24" MIN.
(60.96 cm)
VERTICAL DUCTHORIZONTAL DUCT
MAIN COLLECTOR DUCT
MAIN COLLECTOR DUCT
Number
of Dryers
Minimum Diameter of
Horizontal Collector Duct
Minimum Diameter of
Vertical Collector Duct
1 stack 7 inch (17.8 cm) 8 inch (20.3 cm)
1 stack 8 inch (20.3 cm) 9 inch (22.9 cm)
2 stacks 9 inch (22.9 cm) 10 inch (25.4 cm)
2 stacks 10 inch (25.4 cm) 11 inch (27.9 cm)
3 stacks 11 inch (27.9 cm) 12 inch (30.5 cm)
3 stacks 12 inch (30.5 cm) 13 inch (32.6 cm)
4 stacks 12 inch (30.5 cm) 14 inch (35.6 cm)
4 stacks 13 inch (32.6 cm) 15 inch (38.1 cm)
5 stacks 14 inch (35.6 cm) 15 inch (38.1 cm)
5 stacks 14 inch (35.6 cm) 16 inch (40.6 cm)