The Hidden Hero of Wet Sprinkler Systems: Meet the AR 1 Air Vent

When we talk about wet sprinkler systems, most people think about piping, heads, valves, or waterflow switches. But there’s one small component quietly doing a big job behind the scenes, the AR‑1 Air Vent.

Why Air Vents Matter

Trapped air in a wet sprinkler system isn’t just an inconvenience, it’s a corrosive threat. Oxygen left in the system reacts with water and metal over time, leading to internal corrosion, scale buildup, and eventually, leaks or failures.

That’s why NFPA 13 requires a means of venting air in every metallic wet pipe system. Without it, you’re inviting future service calls, costly repairs, and possible system downtime.

Enter the AR‑1

The Model AR‑1 from United Fire Systems is a purpose-built solution designed to meet that NFPA requirement and exceed expectations.

It’s:

• Fully assembled and ready for install
• Float-operated for automatic air release
• Strainer-equipped to keep debris out of the valve
• Fitted with a dielectric fitting to prevent galvanic corrosion
• Code-compliant and easy to inspect

Plus, its compact, rugged design makes it an ideal fit for both new installations and retrofits. Whether you’re working on a small retail space or a multi-story commercial building, the AR‑1 gives you peace of mind and proof of compliance.

Simplify Maintenance. Extend System Life.

Air vents like the AR‑1 reduce corrosion risk, extend the life of your system, and lower the chance of pinhole leaks or nuisance alarms. For contractors and building owners alike, that’s a big return on a small investment.

Written By:

Ashley Villa, Marketing Manager

avilla@ufpco.com