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Sprinkler Devices in NYC & Beyond

Air Release for Wet Sprinkler Systems

The FM approved United Fire Systems Model AR-1 Wet-Pipe Fire Sprinkler System Air Release is a device for automatically releasing the trapped air from the high point(s) of a wet sprinkler system.

Trapped air contains oxygen, which, when combined with water, is the primary cause of internal pipe corrosion. This corrosion can lead to pipe blockage, leaks, and pipe failure.

The FM approved United Fire Systems AR-1 air release is installed at the system high point(s). Air is vented until water reaches the internal float valve, which automatically closes the device to prevent water release.

To learn more about our sprinkler devices, give us a call at 908.688.0300 or contact UNITED Fire Systems online. 

Features & Benefits of Model AR-1 Wet-Pipe Fire Sprinkler System Air Release

  • FM approved – Complies with NFPA 13 component listing requirement
  • Dielectric union – Prevents dissimilar metal corrosion
  • Ball valve – Allows AR-1 servicing without sprinkler system shutdown
  • Float valve – Automatic shutoff of the outlet when air is vented and water reaches the device
  • Strainer – Protects float valve from particulate matter that could contaminate valve seat
  • Outlet tubing connection – Provides optional connection for remote draining

NFPA 13 Requirements

The 2016 edition of NFPA 13, Standard for the Installation of Sprinkler Systems, requires a method to vent trapped air in all new wet pipe sprinkler systems. The language of this requirement is:

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.

7.1.5.1 Venting from multiple points on each system shall not be required.

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 using one of the following methods:


Data Sheets


Instruction Sheet


Engineering Specifications & Drawings


Warranty Information


Links to Our Other Products


Contact UNITED Fire Systems Today

To schedule service, contact us online or give us a call at 908.688.0300. We proudly serve New York City, Atlanta, Dallas, San Francisco, Houston, and Kenilworth.

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Did You Know?
  • If you have a dry standpipe in your structure, can you tell if it’s intact and ready for fire department use? If it’s not, the risk is high.  Be sure – a UNITED Fire Systems STANDPIPE-PAC system will alert you if someone accidentally leaves a valve open or even disassembles a portion of the standpipe inadvertently.