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Is there a minimum distance that is required in NFPA 13 from a sprinkler head to an opening in a dropped ceiling?

Question asked by durnfordd on Dec 6, 2018

I have a commercial restaurant with an NFPA 96 hood installed.  They have left the ceiling tiles cut 3" back from the hood for clearance to limited combustibles.  This creates a 3" gap all around the hood.  Is there a minimum distance that a sprinkler head needs to be kept from this opening in order to activate properly?  Does NFPA 13 permit this gap to begin with?


There are no sprinkler heads in the ceiling cavity above the dropped ceiling.