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The figures below illustrate the acceptable methods of supporting horizontal round and rectangular ducting. In locations where hangers are exposed to a corrosive atmosphere, hanger material shall be protected with a suitable protective coating.

Support for Vertical Duct
 
Horizontal Duct Hangers

Hanger requirements for horizontal PVC Duct

ROUND DUCT

Duct Diameter

Minimum clamp or hanger

Rod Diameter

Maximum centre spacing

18" and below

1 1/2" x 1/8"

1/4"

8' -0"

19" thru 32"

2" x 3/16"

3/8"

8' -0"

33" and above

3" x 3/16"

3/8"

8' -0"

 

RECTANGULAR DUCT

Duct Diameter

Minimum size of angle

Rod Diameter

Minimum spacing

18" and below

1 1/2" x 1 1/2" x 1/8"

1/4"

8' -0"

19" thru 54"

2" x 2" x 3/16"

3/8"

8' -0"

 

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