How do I transition from rectangular black iron to a high-velocity exhaust fan?

Use a heavy-duty, factory-welded black iron square-to-round transition adapter that matches the exact gauge of the duct trunk.

['Use a heavy-duty, factory-welded black iron square-to-round transition adapter that matches the exact gauge of the duct trunk.', 'Fasten the final round flange to the inlet base of the upblast exhaust fan using a continuous rated high-temperature gasket and heavy structural bolts. Do not use standard lightweight slip-joints or tek screws here.']

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.

Check

• Fasten the final round flange to the inlet base of the upblast exhaust fan using a continuous rated high-temperature gasket and heavy structural bolts. Do not use standard lightweight slip-joints or tek screws here.

Steps

• Stop and verify the approved detail, manufacturer instructions, foreman direction, and project specs before touching it.
• Use a heavy-duty, factory-welded black iron square-to-round transition adapter that matches the exact gauge of the duct trunk.
• Fasten the final round flange to the inlet base of the upblast exhaust fan using a continuous rated high-temperature gasket and heavy structural bolts. Do not use standard lightweight...

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