Focus on the actual issue: duct transition too abrupt at fan/equipment.
Photograph or mark the condition if someone else needs to approve it.
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In Equipment Connections: RTU, AHU, VAV, Fans & Louvers, I’m looking at: What do I do when duct transition too abrupt at fan/equipment? What should I verify before I cut, drill, seal, cover, move, or install?
Do not
Do not force a transition to make a wrong opening, bad layout, or blocked access look acceptable.