TinnerFlow™3rd YearSealing & InsulationRED · Stop / Verify
Use heavy structural steel Riser Clamps (Angle Iron Supports) fastened securely to the left and right exterior sides of the duct body.
Use heavy structural steel Riser Clamps (Angle Iron Supports) fastened securely to the left and right exterior sides of the duct body.
These heavy horizontal angle bars extend outward past the floor hole cutout lines, resting their full load weight directly flat onto the structural concrete floor slab or structural steel perimeter framing channels at each floor landing.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.