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Air Release for Wet Sprinklers

 
 
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 Model 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 Air Release for Wet Sprinklers, 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:


Certifications and Approvals

The Model AR-1 Air Release is approved by Factory Mutual (FM) and listed with the California State Fire Marshall (CSFM). Below are links to each of these documents in PDF format.


Data Sheets


Instruction Sheets


Warranty Information


Engineering Specifications & Drawings


Links to Our Other Products


Contact UNITED Fire Systems Today

Give us a call at 908.688.0300 or contact us online to request more information about our Sprinkler Accessories.

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Did You Know?
  • Your wet-pipe sprinkler system may not be as filled with water as you expect it to be. A bubble of air may migrate to the highest point in the system, creating a very vulnerable location for internal pipe corrosion. That’s why NFPA 13 now requires that all new wet sprinkler systems be fitted with an air vent at the system’s highest point. This is a good investment for both new and existing systems. The UNITED Fire Systems Model AR-1 automatic air release device is Factory Mutual (FM) Approved for just this function. See here for more information, and take action to prevent damaging corrosion.