Per NFPA 13D 2019 Edition Section 126.96.36.199, "Concealed Sprinklers shall be permitted to be installed in beams not greater than 4 in. (100mm) in depth."
Semi-recessed heads can be permitted to be installed in beams up to 14in.
Why do concealed sprinklers installed in beamed applications have a 4 inch limitation?
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