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  1. DavidK7107

    Arm Over vs Unsupported Lengths

    For the purposes of this question I'll reference NFPA 13 2019 edition, and the pressure is below 100 psi 17.4.3.4 Unsupported length between the end sprinkler and the last hanger on the line shall not be greater than 36 inches for 1 in pipe. 17.4.3.5.1 The cumulative horizontal length of an...

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