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

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.

['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.', '--']

Airflow, Noise, Vibration & TAB 2nd Year RED

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.
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...

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how do i frame an opening for a backdraft damper in a brick shaft?