The cross-breaks on this section [are missing / look too shallow / are on the wrong panel]. Is this a fabrication issue that needs to go back to the shop, or is it acceptable for this application?
Watch out
Do not force the duct until it buckles or locks in wrong.
Check
Cross-breaks should appear on the large flat panels where the approved fabrication/detail requires them.
If they are missing entirely on a panel that should have them per the spec: flag it. Missing cross-breaks on larger panel duct is a fabrication deficiency, not something to fix casually in the field.
If they look shallow: light cross-breaks can still be functional. If the panel visibly oil-cans when you push on it, that is the field clue that it may be a problem.
If they are on the wrong face, check whether the section was fabricated or oriented incorrectly before installing.
Do not try to add cross-breaks in the field with a hammer - an improperly placed field break can damage the sheet and weaken the duct face.
Steps
Cross-breaks should appear on the large flat panels where the approved fabrication/detail requires them.
If they are missing entirely on a panel that should have them per the spec: flag it. Missing cross-breaks on larger panel duct is a fabrication deficiency, not something to fix casually in the field.
If they look shallow: light cross-breaks can still be functional. If the panel visibly oil-cans when you push on it, that is the field clue that it may be a problem.
If they are on the wrong face, check whether the section was fabricated or oriented incorrectly before installing.
Do not try to add cross-breaks in the field with a hammer - an improperly placed field break can damage the sheet and weaken the duct face.
Say this to your foreman
The cross-breaks on this section [are missing / look too shallow / are on the wrong panel]. Is this a fabrication issue that needs to go back to the shop, or is it acceptable for this application?