Stop the movement and identify the exact contact point. Verify opening size, sleeve position, connector projection, reinforcement, insulation allowance, and section rotation before trying again.
The riser section is binding at the floor opening and is still supported. I checked the visible sides and the connector is contacting the sleeve. Do you want it lowered for measurement before we change anything?
Watch out
Do not ram, pry, hammer, or grind the opening while the section is suspended.
Check
Keep the section supported and stable.
Inspect all sides of the opening from a safe position.
Compare actual opening and duct dimensions with current drawings.
Check whether the section must pass in a specific rotation.
Steps
Keep the section supported and stable.
Inspect all sides of the opening from a safe position.
Compare actual opening and duct dimensions with current drawings.
Check whether the section must pass in a specific rotation.
Say this to your foreman
The riser section is binding at the floor opening and is still supported. I checked the visible sides and the connector is contacting the sleeve. Do you want it lowered for measurement before we change anything?