NFPA 13 2016 Edition, Section 7.1.5 Air Venting.
A single air vent with a connection conforming to 8.16.6 shall be provided on each wet pipe system utilizing metallic pipe.
Does the term "utilizing" mean that any system using metallic pipe in any part of it should have an air vent? Would a system with steel verticals and CPVC horizontals then require an air vent?
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