How do I verify that our shop-fabricated fire damper sleeves meet UL listing requirements?

Cross-reference the metal thickness gauge of your fabricated sleeve against the factory damper manual parameters. Most UL listings state that a fire damper sleeve must be constructed of at least 16-gauge steel if the damper uses regular field breakaway joints, or a minimum of 18-gauge steel for smaller single-section units. Check that the sleeve length does not extend out more than 6 inches past the finished face of the rated wall assembly line.

['Cross-reference the metal thickness gauge of your fabricated sleeve against the factory damper manual parameters. Most UL listings state that a fire damper sleeve must be constructed of at least 16-gauge steel if the damper uses regular field breakaway joints, or a minimum of 18-gauge steel for smaller single-section units. Check that the sleeve length does not extend out more than 6 inches past the finished face of the rated wall assembly line.', '--']

Stop if

• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Steps

• Stop and verify the approved detail, manufacturer instructions, foreman direction, and project specs before touching it.
• Cross-reference the metal thickness gauge of your fabricated sleeve against the factory damper manual parameters. Most UL listings state that a fire damper sleeve must be constructed...

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