TinnerFlow
Size, Pressure & Special Routing · Size, Pressure & Special Routing

Wide rectangular duct over 48 inches

Wide trunk

ConnectionReinforced TDC/angle
SupportEngineered wide trapeze

Before you start

  • Confirm width over 48 inches, gauge, reinforcement, tie rods, flange system, support span, lifting method, and panel pressure.
  • Inspect wide panels for bowing, oil-canning, damaged reinforcement, and flange distortion.
  • Use spreader or multiple lift points.
  • Verify engineered wide trapezes are ready.

Tools and materials

Wide rectangular duct, reinforced TDC or angle-joint components, gasket, corners, cleats or bolts, engineered wide trapezes, spreader lifting equipment, clamps, drift pins, level, and sealant.

Lay it out

  1. Mark bottom plane and support locations.
  2. Keep supports clear of flanges.
  3. Plan fitting and reinforcement access.

Set and support it

  1. Install wide trapezes before lifting.
  2. Use spread lifting points.
  3. Support heavy fittings independently.

Make the connection

  1. 1

    Set the first section on wide support.

  2. 2

    Bring the second section to the same bottom plane.

  3. 3

    Install gasket and align flanges.

  4. 4

    Drift and clamp without bowing the flange.

  5. 5

    Install all corners, cleats, bolts, and reinforcement.

  6. 6

    Seal required joints.

  7. 7

    Load support and inspect the bottom panel.

Check the install

  • Flanges remain straight.
  • Reinforcement and tie rods are complete.
  • The bottom plane is stable.
  • The joint carries no support load.
  • No panel buckling remains.

Common mistakes

  • Lifting from one point.
  • Skipping tie rods or reinforcement.
  • Using bolts to pull bowed flanges together.
  • Using a narrow trapeze.

Stop and ask

Stop if required reinforcement, tie rods, wide support, or lifting control is missing for the duct width.