Exposed spiral supply main

Before you start

• Confirm the approved exposed-duct layout, centerline, elevation, fitting sequence, seam orientation, hanger type, finish standard, and visible joint treatment before material is lifted.
• Walk the entire sightline from the main viewing directions. Exposed duct can be technically connected and still look wrong.
• Inspect every section for dents, scratched finish, crooked seams, damaged beads, labels, and shop marks.
• Stage clean sections in installation order and protect them from carts, ladders, dirty gloves, and grinding dust.

Lay it out

1. Laser the complete run before installing the first hanger.
2. Lay out a consistent hanger rhythm, joint rhythm, fitting orientation, and seam clock.
3. Coordinate lights, sprinklers, cable tray, signs, diffusers, and ceiling features so the duct does not look like it wandered around them.

Set and support it

1. Install and align the visible supports before lifting duct.
2. Keep bands, rods, cables, or saddles symmetrical and consistent through the run.
3. Use padded handling and enough control points to prevent swinging, dents, or finish damage.

Make the connection

1. 1

   Set the first section to the laser line and establish the seam orientation.

2. 2

   Bring the next section to the same centerline and elevation before seating the joint.

3. 3

   Rotate the seam to match the established clock.

4. 4

   Seat the gasketed or slip joint fully and install fasteners in a consistent, least-visible pattern.

5. 5

   Use only the required sealant and keep it off the visible surface.

6. 6

   Load the supports and recheck the sightline before adding the next section.

7. 7

   Remove labels, fingerprints, and installation marks as the work progresses.