What do I do if the drive cleat is too short or too long?
Use a drive cleat that fits the joint correctly. Too short can miss engagement; too long can interfere with corners, S-locks, insulation, or safe handling.
Replace or correct the drive length. A drive that barely catches the joint is not a finished connection.
Ask when you do not know the required drive length allowance or if trimming changes the intended corner finish.
Watch out
Do not pretend a short or wrong-length drive is acceptable because it is hard to reach.
Check
Check full engagement
Check both corners
Verify the drive length before cover
Steps
Compare the drive length to the joint width before installing.
If too short, replace it instead of patching the missing engagement.
If too long, trim only if allowed and finish the sharp edge.
Confirm the drive still seats full length.
Ask if the length difference suggests wrong material or wrong duct piece.
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In Rectangular Duct Assembly: S-and-Drive, I'm looking at: What do I do if the drive cleat is too short or too long? What should I verify before I cut, drill, seal, cover, move, or install?