A flanged joint that cannot be reached is a coordination problem. If the duct is already trapped near a beam, stop and verify tool access before forcing the joint or calling it complete.
Confirm which bolts/corners cannot be reached and mark the location.
Try only approved/safe access options such as offset wrench, crowfoot/socket extension, different lift position, or access from another side.
Check whether insulation/ceiling will make access worse.
Photograph the blocked tool clearance.
Ask before loosening supports, cutting, moving duct, or leaving bolts unverified.
Ask foreman
This flange is trapped near the beam and I cannot reach the bolts on this side. Do you want me to try an offset/crowfoot tool, change access, or hold for another fix?
Do not
Do not leave inaccessible flange hardware loose, uninspected, or hidden because the duct is already in place.
Why it matters
If a joint cannot be tightened, inspected, sealed, or repaired, the install problem becomes a leakage, access, and rework problem.
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