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Apprentice Q&A · #360

Why is an adjustable 45-degree elbow leaking at the gore seam?

2nd YearGREEN · Standard CorrectionAdjustable Gore Leak

Short answer

The gore segment may not be fully seated in its swage track. Reset the elbow mechanically first, then fasten and seal it.

Field answer

Adjustable elbows seal only when the gore segments are nested correctly. If one segment is sitting proud or off its track, the seam can leave a jagged gap that leaks under pressure.

Loosen any lock screws, rotate the gore back into position, check the throat is round/open, then fasten and seal. If the seam is bent or cracked, replace the fitting instead of hiding it with sealant.

What to check first

Do not do this

Do not smear mastic over a misaligned gore seam without fixing the mechanical seating first.

Why it matters

Misnested gores leak, whistle, and can move again when the fan starts.

Ask foreman

The adjustable 45 at [location] is leaking because one gore segment is not seated in its track. I can reset and fasten it, or replace it if the seam is damaged. Which do you want?

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Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.