Lowering Duct Into a Shaft Without Controlling Rotation

Fast answer

Before the section enters the opening, confirm the approved handling plan, support points, communication, and how rotation will be controlled. A long section can turn, bind, or strike the shaft wall even when its weight is supported.

What to check

1. Identify the section length, shape, connector orientation, and center of balance.
2. Check the shaft opening, wall framing, installed services, and receiving position below.
3. Confirm the lead communicator and stop command.
4. Verify the approved temporary support and transfer sequence.

Do not

Do not improvise a lowering method, stand below an uncontrolled section, or use the shaft wall as a guide surface.

Ask the foreman

“We have the riser section staged at the shaft opening. I checked the opening, receiving elevation, and connector orientation. What is the approved handling and rotation-control plan before this section enters the shaft?”

Why it matters

An uncontrolled section can rotate, bind, damage rated construction, or place workers in a line of fire.