Static field route #555

What do I do when forgetting the thickness of Ductmate/TDC flange in tight space?

Measuring, Field Verification & Layout MarksFoundation layout starter — field verify before cutting/loading

Account for TDC/Ductmate flange thickness in tight spaces. The flange is part of the installed size.

Open in Field Rescue Open category

Field checklist

Check duct outside dimension plus flange.
Measure clearance at the tightest point.
Include gasket, bolts/clips, insulation, and access.
Verify adjacent trades/ceiling.
Ask before installing if the flange makes it too tight.

Ask foreman

Does this tight space clear the TDC/Ductmate flange, gasket, bolts, and insulation?

Do not

Do not measure only the duct body when flange hardware must pass through the space.

Why it matters

Flanges turn a bare duct dimension into a larger installed envelope.

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