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Dampers, Penetrations & Life Safety · Dampers & Life Safety

Round fire damper

Round rated penetration

ConnectionListed round breakaway
SupportIndependent supports

Before you start

  • Confirm the exact round fire-damper model, sleeve or collar assembly, wall or floor rating, retaining method, breakaway connection, and access requirement.
  • Inspect the round frame, blades, sleeve, label, link, and factory components for damage.
  • Verify the opening size and annular space match the listed assembly.
  • Do not flatten, notch, shorten, or field-modify the round damper or sleeve.

Tools and materials

Listed round fire damper, sleeve or collar components, exact retaining hardware, listed breakaway connection, access-door materials, tape, level, manufacturer instructions, and approved fasteners.

Lay it out

  1. Mark the damper centerline through the rated opening.
  2. Orient the access side and operating components where they can be reached.
  3. Coordinate independent duct supports before installation.

Set and support it

  1. Support both round duct runs independently.
  2. Hold the damper assembly centered without deforming the round frame.
  3. Maintain listed clearances around the sleeve.

Make the connection

  1. 1

    Verify the exact opening and listed assembly.

  2. 2

    Set the damper centered and in the correct plane.

  3. 3

    Install the listed retaining method.

  4. 4

    Connect both duct sides with the approved round breakaway detail.

  5. 5

    Install access as required.

  6. 6

    Cycle or inspect the blades without forcing them.

  7. 7

    Complete inspection before concealment.

Check the install

  • The damper remains round and centered.
  • The retaining and breakaway details match the listing.
  • The blades move freely.
  • Access and labels remain visible.
  • The duct carries no load through the sleeve.

Common mistakes

  • Field-cutting the sleeve to make the opening fit.
  • Overtightening the round connection and distorting the frame.
  • Using an ordinary slip joint instead of the listed breakaway.
  • Leaving no usable access.

Stop and ask

Stop for any proposed field alteration of the damper or sleeve, a mismatched opening, or an installation detail not covered by the listing.