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Exposed Architectural Duct ยท Exposed Architectural

Exposed duct with seismic bracing

Architectural/seismic zone

ConnectionStandard duct joints with independent bracing
SupportSeismic cables/struts plus gravity supports

Before you start

  • Confirm the engineered seismic-bracing layout, attachment points, brace angles, hardware, gravity support separation, clearances, finish, and inspection requirements.
  • Do not select brace anchors or load paths from habit. Use the approved seismic detail.
  • Coordinate brace locations with the exposed architectural sightline, lights, sprinklers, access, and equipment service space.
  • Inspect structure and duct reinforcement at every proposed attachment.

Tools and materials

Approved seismic cables or struts, engineered anchors and attachments, gravity supports, brace hardware, isolation and finish-protection materials, torque or installation tools specified by the system, laser, level, marker, and approved touch-up products.

Lay it out

  1. Lay out gravity supports and seismic braces as separate systems.
  2. Mark engineered brace attachment points and angles.
  3. Coordinate the visible brace pattern so required safety hardware remains organized and does not block access.

Set and support it

  1. Complete and level the gravity supports before tensioning or adjusting seismic braces.
  2. Install only approved structural attachments.
  3. Protect exposed duct and finish from brace contact.

Make the connection

  1. 1

    Verify the exact brace location and attachment detail.

  2. 2

    Install structural anchors and brace hardware using the approved method.

  3. 3

    Connect braces to the designated duct or support attachment point.

  4. 4

    Adjust or tension braces without pulling the duct out of level or centerline.

  5. 5

    Install required restraints, locks, or labels.

  6. 6

    Touch up finish damage using the approved system.

  7. 7

    Complete inspection and document concealed or hard-to-see attachments.

Check the install

  • Brace type, location, angle, and attachment match the approved detail.
  • Gravity supports continue to carry the duct weight.
  • The duct remains level and aligned after bracing.
  • Braces do not block access or damage the finish.
  • Hardware is secure and visually organized.

Common mistakes

  • Using seismic cables as gravity supports.
  • Tensioning a brace until the duct moves out of line.
  • Attaching to unapproved structure.
  • Relocating a brace for appearance without engineering approval.

Stop and ask

Stop if the brace attachment, load path, anchor, angle, duct reinforcement, or field relocation is not shown in the engineered seismic design.