How do I fix a screaming TDC/Ductmate gasket leak

Plain-English answer

A high-pitched scream at a flanged joint is a small leak moving a lot of air. The joint may have a folded gasket, dirty flange, loose corner, missing clip/cleat, bowed span, or uneven compression.

Shut down if needed for safe access. Inspect the whole joint, not just the loud spot. Correct gasket seating, clips/cleats, bolts, flange alignment, and approved sealant method. If the flange is bent or the gasket is trapped, the joint may need to be reopened.

Field checklist

• Find the exact leaking corner or span without putting hands near unsafe moving air/equipment.
• Check gasket continuity, corner bolts, flange clips/cleats, flange bowing, and duct support.
• Look for dirt, folded gasket, missing gasket, or a flange pulled out of square.
• Use the approved repair/seal method for that connector and pressure class.
• Recheck after startup/test before insulation or ceiling cover.

Ask Foreman

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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