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  1. plumbingandfiredesgn

    2021 IPC - Air Admittance Valve for Common Vents

    Good morning, Are air-admittance valves approved for common vents per the 2021 IPC? §918.3: "Individual, branch and circuit vents shall be permitted to terminate to an [...] air admittance valve". There is no mention of common vents here, but maybe common vents are qualified as individual vents?
  2. plumbingandfiredesgn

    NFPA 13 - Highly Sloped Ceiling/Wall & Ordinary Hazard Sidewall Sprinkler

    Hello, I'm looking to use sidewall sprinklers for a heavily sloped skylight funnel (large enough that it needs to be covered by sprinklers). The slope of the funnel walls are something close to 177:100. This is an ordinary hazard occupancy. In NFPA 13, 2019, section 10.3.2, they specify that...
  3. plumbingandfiredesgn

    NFPA 13 - 200 PSI Test, RPZs @ 175 PSI working Pressure

    Hi all, I have a concern regarding NFPA 13's 200 PSI Hydraulic test requirements. Every 6" OS&Y RPZ (Reduced Pressure Zone) device that I have found is only rated for 175 PSI working pressure, so I'm quite concerned about the 200 PSI test, but I can't imagine they've been designed with such an...

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