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Apprentice Q&A · #080

How do I frame an opening for a backdraft damper in a brick shaft?

2nd YearDampersRED · Stop / Verify

Install a heavy-gauge structural steel angle iron frame sleeve anchored securely into the masonry opening using concrete wedge anchors. * Fasten your backdraft damper outer frame to this rigid structural steel lining box, taking care that the damper blades sit perfectly horizontal so that gravity can pull them closed when air pressure drops.

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Plain-English answer

Install a heavy-gauge structural steel angle iron frame sleeve anchored securely into the masonry opening using concrete wedge anchors. * Fasten your backdraft damper outer frame to this rigid structural steel lining box, taking care that the damper blades sit perfectly horizontal so that gravity can pull them closed when air pressure drops.

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Field checklist

Ask Foreman

Hey boss, I’m on dampers and need verification before I touch this: How do I frame an opening for a backdraft damper in a brick shaft? Do you want me to stop here and check the approved detail, submittal, or inspector/manufacturer requirement first?

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Verify before acting

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.

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