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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?

Thank you all for the help! The gas dynamics at the corner are a great point I hadn't considered at all. I'll be sticking to some pendants in this case.

Thank you MGXFP. Are you suggesting upright sprinklers for a particular reason, instead of the sidewall sprinklers aimed along the slope?

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...

Thank you both, very much appreciated. I'll check with the manufacturer since their sheets don't indicate a maximum test pressure (unlike all the other equipment that's clear about their difference). mk3223, do you remember if that's part of NFPA 13? NFPA 25?

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...