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  1. emeffinp

    4 Story TH with a Pump

    I'm working on the design for a 4 story TH unit. The AHJ is requiring, since this is 4 story project, that the system comply with NFPA 13R (though the TH on either side are 13D). The problem is that my hydraulic calculations don't work due to insufficient pressure. 13R bumps me into NFPA 20...

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