Install S-and-drive on a vertical drop

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.
• Confirm the upper and lower supports or restraints are installed before the vertical joint is assembled.

Lay it out

1. Establish a plumb reference from structure, wall line, or the approved riser/drop centerline.
2. Check that the lower connection, boot, or terminal can be reached without using the joint to correct an offset.
3. Plan the drive orientation so the ends can be secured and inspected after the drop is in place.

Set and support it

1. Secure the upper section independently.
2. Lift the lower section into position and restrain it so it cannot fall or rotate.
3. Match the side planes and confirm the lower section is plumb before closing the joint.

Make the connection

1. 1

   Fit the S-cleats to the horizontal hems while the lower section is controlled.

2. 2

   Bring the vertical faces together evenly and verify all corners enter the locks.

3. 3

   Start the side drives from the safest accessible direction.

4. 4

   Seat both drives fully while keeping the lower section restrained.

5. 5

   Finish the drive ends and seal the joint.

6. 6

   Install or confirm the lower support, boot support, or lateral restraint before removing the lift.