Liner interrupts damper operation

Liner must not block damper blade travel, actuator movement, or access. Treat interference at dampers as a stop-and-verify issue.

Stop if

• This liner looks like it may interfere with the damper blade or actuator. Can you verify before I trim or cover it?

Watch out

• Do not trim around a fire/smoke/control damper without approval.

Check

• Open/close or visually trace the damper blade path if allowed.
• Check for liner, screws, insulation, or debris in the movement path.
• Confirm access side and service clearance.
• Get foreman direction before trimming or modifying liner near life-safety or control dampers.

Steps

• Open/close or visually trace the damper blade path if allowed.
• Check for liner, screws, insulation, or debris in the movement path.
• Confirm access side and service clearance.
• Get foreman direction before trimming or modifying liner near life-safety or control dampers.

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