NFPA 13 Section 8.15.4 (2013 Edition) requires certain types of unenclosed floor openings to be protected with closely spaced sprinklers where sprinklers serve as an alternative to the enclosure of the vertical opening.
What method do you use to determine if the opening requires enclosure, and thus closely-spaced sprinklers?
As a sprinkler designer, I may overlook something in the Building Code that allows the unprotected opening, or vice versa.
A pre-bid RFI to the architect seems to be the best course, but it would be nice to have something to hang the hat on before the bid is submitted.
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