Per NFPA 13D 2019 Edition Section 220.127.116.11, "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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2/27/2020 12:29:12 pm
Best guess (not sure it is the exact reason)
2/27/2020 01:51:13 pm
My interpretation is.... For concealed sprinklers will have a delay in reaction time due to the heat or smoke passing through the vents of the concealed sprinkler. And if position lower it cannot collect the heat as quickly as pendent sprinklers.
3/6/2020 10:45:40 am
The exact reason is 300mm or 12inch from the bottom of true ceiling ,the fume or heat generated will be more at these space.
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