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IMPORTANT: If several dryers are exhausted into a main collector
duct, it is essential that ductwork be adequate in size and properly
constructed for efficient operation.
·
Main collector duct should be sized according to specifications shown
below.
Minimum
Diameter of
Vertical
Collector Duct
Minimum
Diameter of
Horizontal
Collector Duct
Number
of Dryers
2
7 inch (17.78 cm)
8 inch (20.32 cm)
3
8 inch (20.32 cm)
9 inch (22.86 cm)
4
9 inch (22.86 cm)
10 inch (25.40 cm)
5
10 inch (25.40 cm)
11 inch (27.94 cm)
6
11 inch (27.94 cm)
12 inch (30.48 cm)
7
12 inch (30.48 cm)
13 inch (32.62 cm)
8
12 inch (30.48 cm)
14 inch (35.56 cm)
9
13 inch (32.62 cm)
15 inch (38.10 cm)
10
14 inch (35.56 cm)
15 inch (38.10 cm)
11
14 inch (35.56 cm)
16 inch (40.64 cm)
NOTE: Main collector ducts 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.
(continued)
