Focus on the actual issue: wrong diffuser/boot connection at terminal unit.
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 wrong diffuser/boot connection at terminal unit? What should I verify before I cut, drill, seal, cover, move, or install?
Do not
Do not connect to a diffuser or boot just because it is nearby.