Apprentice answer

How far apart should the cleats be on a TDC/TDF transverse joint

1st YearDuct Assembly, Seams & JointsCheck first

Per SMACNA standards, space transverse cleats approximately 6 to 12 inches apart, depending on the duct dimensions and the internal static pressure rating of the system. * At minimum, ensure a cleat is installed within 2 inches of each corner to stop the high-pressure flange from bowing open.

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Plain-English answer

Field checklist

Per SMACNA standards, space transverse cleats approximately 6 to 12 inches apart, depending on the duct dimensions and the internal static pressure rating of the system. * At minimum,...

Ask Foreman

Hey boss, I’m checking duct assembly: How far apart should the cleats be on a TDC/TDF transverse joint? I found the likely issue and want to verify the next step before I lock it in. Do you want me to adjust it now or check the drawing/detail first?

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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