A flex duct clamp cuts the outer vapor jacket

A clamp should secure flex, not slice the jacket. Back off the tension, patch torn vapor barrier, and verify the connection is tight without crushing or cutting the flex.

Stop if

• The tension gun cut straight through the plastic jacket because the clutch was set too high. Back the torque off, and wrap that cut tight with two layers of Mylar tape to seal our vapor barrier.

Watch out

• Do not crank the tension gun until it cuts into the flex jacket.

Check

• Check clamp tension before final lock.
• Look for sliced vapor jacket or crushed inner liner.
• Patch vapor jacket with approved tape/material.
• Make sure the inner core is separately secured as required.
• Recheck the run for kinks after tightening.

Steps

• Check clamp tension before final lock.
• Look for sliced vapor jacket or crushed inner liner.
• Patch vapor jacket with approved tape/material.
• Make sure the inner core is separately secured as required.
• Recheck the run for kinks after tightening.

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