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NFPA 13 (2016)

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.

8.16.6* Air Venting
The vent required by 7.1.5 shall be located near a high point in the system to allow air to be removed from that portion of the system by one of the following methods:

  • Manual vavlve, minimum ½" (15mm) size
  • Automatic air vent
  • Other approved means