If you have an open ceiling (both corridor and adjacent rooms), with a lot of ductwork and plumbing hugging the deck that may cause issues for sprinkler discharge, can you consider it obstructed construction and move the upright sprinkler 22" down from the deck to help avoid the obstructions? (Per NFPA 18.104.22.168.2)
No ceiling tile, ordinary hazard, not large beams either.
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