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ECS Ejector Automatic Air Vent

This FM Approved 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.

Interested in a higher level of corrosion protection for wet pipe systems? Learn more about Wet Pipe Nitrogen Inerting (WPNI).

Benefits Of The ECS Ejector Automatic Air Vent

  • Reduces corrosion by removing oxygen from the sprinkler system
  • Helps reduce false water flow alarms created by large pockets of compressed gas in the sprinkler system
  • Helps improve sprinkler system response/water delivery time
  • 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)
  • High visibility pressure indicator located downstream of primary float valve designed to be visible from the floor up to 30 feet below the vent to indicate if primary float valve is functional
  • Temperature range: 30-120 degrees F (4.5-49 degrees C)
  • Brass construction allows device to be used in areas subject to external corrosion
  • FM Approved per Approval Standard 1344

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 pressure indicator is visible from below
  • Do NOT install in location downstream of water trap

Vent Installation Example

ECS Automatic Air Vent Installation is a phone call away