How To Support Round Ducts On Roof

Also offsets are elbows.

How to support round ducts on roof.

Consideration must be given with restraining ducts to avoid development of excessive internal duct stresses caused by expansion or contraction due to temperature variations. 7 0 72 1 4 to 84 dia. These goalpost type duct supports used for ducting on a flat roof are fabricated from angle iron for small ducts and from channel iron for very large ducts. Use your leg a workbench or the ground to support the back side of the pipe.

6 0 60 1 4 to 72 dia. Locate a support within 2 0 of the ends of any elbows including the elbows that may be turning vertically to penetrate the roof. When assembling pipe start at one end and work the seam together like a zipper. 2 0 12 1 4 to 24 dia.

Php d enclosed duct support. 5 0 48 1 4 to 60 dia. Sometimes concrete pads are placed under each foot. This support can meet nearly all height requirements above the roof surface and is approved for seismic and high wind applications.

Use one hand to keep the two edges close and the other to apply downward pressure. Round duct size equipment rail length. A foot pad must be provided for each leg to prevent the support from cutting into the waterproofing membrane. Use an intermediate support on elbows where the center line length plus 4 0 is greater than the support spacing for the duct type.

Php d duct support the php d duct support leverages a goal post design with a single crossbar below the duct to support all sizes of square or round ducting cable trays and piping. Up to 12 diameter. Assemble the metal ducting like a zipper.