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ECS Protector Nitrogen Inerting Vent (New Design)


Dimensions: 16”(W) X 7”(D) X 12”(H)
Weight: 20 lbs
Vent Connection: 1/2" MNPT
Injection Port Connection: 1" MNPT
Venting Orifice: 3/32"
Pressure Regulator:
factory set at 40 psi


Product Spec Sheet (840 mb)
Dimensional Drawing (1.08 mb)
  • For wet pipe fire sprinkler systems
  • Designed specifically for wet pipe nitrogen inerting (WPNI)
  • Rated up to 175 PSIG
  • U.S. Patent No. 8,636,023

This product is designed to allow controlled venting of trapped gases within a fire sprinkler system when the system is filled with water after wet pipe nitrogen inerting (WPNI) has been performed. The vent, located at the top of the system, automatically releases the gas when appropriate.

Click here to see why a vent is necessary for Wet Pipe Nitrogen Inerting.


  • During the nitrogen inerting process, the vent remains closed to prevent discharge of nitrogen gas used to displace oxygen, which causes corrosion
  • Once 98% nitrogen concentration in piping is achieved for corrosion control, the vent continues to provide venting of trapped gas that may migrate through the system over time
  • 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 eliminates need to plumb to drain


  • Nitrogen Inerting Vent (model PAV-WN) also includes nitrogen injection port
  • Adjustable pressure regulator integrated on gas discharge piping assembly to prevent discharge during WPNI
  • Gas sample port provides location to verify nitrogen concentration of fire sprinkler system
  • 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: 40-120 degrees F (4.5-49 degrees C)

Installation Notes

  • Install vent assembly remotely on system and nitrogen injection port at riser above system control valve
  • 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