Fire damper retaining angles are pre-attached too tight

Fire damper retaining angles and sleeve details must match the listed installation. Do not pin the damper assembly in a bind; verify the approved clearance/angle detail before fastening.

Stop if

• Don't slam those retaining angles tight against the frame. Code says we must have an eighth-inch expansion gap all around so the sleeve doesn't buckle and jam the fire blades if a fire breaks out.

Watch out

• Do not invent fire damper clearances or tighten angles hard against the frame because it looks cleaner.

Check

• Read the damper label and installation sheet.
• Confirm retaining angle location and fastener pattern.
• Check that the sleeve/frame is not pinched or bound.
• Use the approved spacer/detail if required.
• Have the foreman verify before it is covered.

Steps

• Read the damper label and installation sheet.
• Confirm retaining angle location and fastener pattern.
• Check that the sleeve/frame is not pinched or bound.
• Use the approved spacer/detail if required.
• Have the foreman verify before it is covered.

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