Connect an S-and-drive elbow

Before you start

• Confirm the duct size, end construction, pressure class, seal class, and joint shown on the approved shop drawing.
• Inspect both duct ends for crushed corners, torn locks, bowed panels, loose reinforcement, or shop damage before lifting them into place.
• Make sure the supports are already installed or the sections are otherwise held so the joint is not carrying the weight of the run.
• Stage the correct S-cleats, drive cleats, sealant, hand tools, clamps, and access equipment before starting the joint.

Lay it out

1. Confirm the elbow orientation, throat direction, heel direction, and outgoing centerline.
2. Check that the elbow is the correct radius or vane type for the approved drawing.
3. Locate support so the elbow body is carried independently instead of hanging from either straight joint.

Set and support it

1. Support the elbow near its center of gravity and bring the straight duct to it.
2. Align the incoming and outgoing tangent planes before closing either joint.
3. Keep the elbow from rolling while the first connection is made.

Make the connection

1. 1

   Fit the top and bottom S-cleats to the first mating end.

2. 2

   Align the straight duct with the elbow tangent; do not rotate the elbow to hide a route error.

3. 3

   Start and seat both drives, then verify the elbow is still correctly clocked.

4. 4

   Connect the second side using the same alignment sequence.

5. 5

   Finish the drive ends and seal both joints.

6. 6

   Confirm the elbow support carries the fitting weight before the lift is removed.