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ECS Ejector Automatic Air Vent (legacy design)

  This product provides automatic venting of trapped air in wet pipe fire sprinkler systems that effectively addresses venting requirements in the 2016 edition of NFPA 13.  Trapped air contains oxygen which is the primary cause of corrosion in sprinkler systems. As a fire sprinkler system is filled with water, trapped air migrates to the high remote portion of the system where the vent is located, releasing the air.


FM Approved

  • Reduces corrosion by removing oxygen from the sprinkler system
  • Helps reduce false waterflow alarms created by large pockets of compressed gas in the sprinkler system
  • Vent automatically closes when water has reached the device
  • Redundant float valve design requires no plumbing to drain


  • Air Vent is available in two models: the PAV-W (no wiring) and PAV-WS (includes wiring for monitoring connection)
  • Water indicator located inside sight glass is designed to be visible from the floor up to 30 feet below the vent to indicate if primary float valve has failed
  • Temperature range: 30-120 degrees F (4.5-49 degrees C)
  • Brass fittings allow device to be used in areas subject to external corrosion
  • Only FM approved vent for fire sprinkler systems

Installation Notes

  • Model PAV-WS requires a single contact rated 24V AC/DC @ 2A for electronic monitoring with an EOLR (end of line resistor), detailed in product literature
  • If a location for the vent isn’t provided on project design documents, vent can be installed at an accessible remote high point on the system where sight glass is visible from below
  • Do NOT install in location downstream of water trap