Lowering Duct Into a Shaft Without Controlling Rotation

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?

Equipment Connections: RTU, AHU, VAV, Fans & Louvers 2nd Year RED

Stop if

Stop before changing structural support, rated construction, equipment handling, specialty materials, weatherproofing, engineered movement details, or manufacturer-specific requirements without the responsible direction.

Watch out

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

Check

current drawings and approved details
grid/floor/location and measured conditions
photos showing the installation condition
relevant manufacturer, structural, architectural, or finish information
what has already been checked

Say this to your foreman

lowering duct into a shaft without controlling rotation shaft riser duct rotating lowering through floor opening control rotation 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. 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?

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