I have two large ducts 20-inches below sprinklers. One duct is 32-inches wide, the other is 42-inches wide. There is maybe 4- to 7-inches between them, only a couple inch gap on each side, running the length of a hallway.
The only rule for a continuous obstruction I can find says no coverage is needed below if the obstruction is under 4-feet.
Individually these ducts aren't over 4-feet, but how does NFPA 13 address multiple obstructions like this?
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