How To Support Round Ducts On Roof

Use an intermediate support on elbows where the center line length plus 4 0 is greater than the support spacing for the duct type.

How to support round ducts on roof. 7 0 72 1 4 to 84 dia. Use your leg a workbench or the ground to support the back side of the pipe. Php d enclosed duct support. 4 0 36 1 4 to 48 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. 5 0 48 1 4 to 60 dia. Assemble the metal ducting like a zipper. Support systems for ductwork may provide restraint in three directions against displacement and rotation.

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. Use one hand to keep the two edges close and the other to apply downward pressure. Round duct size equipment rail length. This support can meet nearly all height requirements above the roof surface and is approved for seismic and high wind applications.

Up to 12 diameter. 2 0 12 1 4 to 24 dia. Consideration must be given with restraining ducts to avoid development of excessive internal duct stresses caused by expansion or contraction due to temperature variations. Sometimes concrete pads are placed under each foot.

3 0 24 1 4 to 36 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. A foot pad must be provided for each leg to prevent the support from cutting into the waterproofing membrane.