I have other smaller cloud ceilings that do not exceed 4 ft., however I do not think the sprinklers above have the 18” above the cloud to develop their sprinkler spray, so my gut tells me that means sprinklers are required below the cloud. I think I have seen an NFSA informal interpretation that agrees.
However, what about 184.108.40.206.2 (2016)?
NFPA 13 - 2016
Does that mean it does NOT really need the 18” in order for it to qualify for the following 220.127.116.11.3 rule for obstructions over 4 ft. wide? In other words, my cloud is not over 4 ft. wide, so doesn’t need sprinklers, even if the sprinklers above do not reach full spray development?
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