Riser angle support at floor

Before you start

• Confirm the approved support detail, actual duct weight, support spacing, attachment substrate, hardware size, corrosion protection, and any insulation, seismic, vibration, or rooftop requirements before installation.
• Confirm the floor opening, riser frame or angle detail, duct weight, load-transfer point, lateral restraint, shaft clearance, and firestop separation.
• Verify the floor or structure is approved to receive the riser load.
• Inspect the support angles, frame, attachments, and duct reinforcement.

Lay it out

1. Establish the riser centerline and support elevation.
2. Lay out frame attachment points and firestop clearance.
3. Keep the support separate from the rated penetration system unless the approved detail combines them.

Set and support it

1. Install and secure the support frame before transferring duct weight.
2. Set bearing surfaces level.
3. Provide temporary rigging until the full load path is complete.

Make the connection

1. 1

   Verify the frame and structural attachments.

2. 2

   Lower or raise the riser section into position.

3. 3

   Set the duct onto the approved bearing points.

4. 4

   Confirm the weight is fully transferred to the frame.

5. 5

   Plumb the riser.

6. 6

   Install lateral restraints or guides.

7. 7

   Release rigging slowly and verify the riser does not settle or rotate.