Rectangular Duct & TDC/TDF · Straight Runs & Assembly

Large rectangular TDC duct

Large cross-section trunk

ConnectionReinforced TDC/TDF flange
SupportEngineered trapeze/support spacing based on size and gauge

Before you start

  • This is a lift piece and a rigging conversation, not a two-man carry.
  • Confirm...
  • Stage the needed tools and materials before lifting the section: Lift and soft slings or a spreader bar, heavier trapeze hardware per the deta....

Tools and materials

Lift and soft slings or a spreader bar, heavier trapeze hardware per the deta...

Lay it out

  1. Set the heavier trapezes first, all of them, and level them across the run...

Set and support it

  1. Set the heavier trapezes first, all of them, and level them across the run...
  2. Use the approved support method for this condition: Engineered trapeze/support spacing based on size and gauge.

Make the connection

  1. 1

    Set the heavier trapezes first, all of them, and level them across the run...

Check the install

  • No oil-canning beyond what the spec allows, checked under load with the lif...

Common mistakes

  • Skipping the temporary spreader because 'it looked fine on the ground.' Big...

Stop and ask

Stop if reinforcement, gauge, joint type or lifting plan does not match appro...