Press Release – United Fire Systems’ NITROGEN-PAC™ M Series Earns FM Approval

September 2025 — United Fire Systems is proud to announce that its NITROGEN-PAC™ M Series Nitrogen Generator Modules (Models NGM-5 through NGM-60) have officially achieved FM Approval. This independent certification validates the reliability, safety, and performance of the M Series, strengthening its role as a trusted solution for corrosion inhibition in fire sprinkler systems.

Product Overview

The M Series is designed to generate 98% nitrogen as part of a nitrogen-based corrosion-inhibiting system for fire sprinkler piping. Each module includes:

• Compressed air inlet for flexible integration with existing
• High-capacity particulate and coalescing filters that extend the life of the nitrogen separation
• Nitrogen separator membrane that delivers high-purity nitrogen from compressed
• Factory-adjusted needle valve to maintain optimal back pressure for consistent
• Two pressure gauges for monitoring performance upstream and downstream of the
• Three-way ball valve that allows bypass mode for initial system fill while preventing accidental long-term bypass.
• Heavy-duty enclosure with latching door and lift-off hinges for secure operation and ease of

Models are available in capacities serving sprinkler pipe volumes from 3,000 gallons (NGM-5) up to 31,100 gallons (NGM-60), making the system scalable for projects of all sizes.

Why FM Approval Matters

FM Approvals is a globally recognized third-party certification body. Its rigorous testing standards ensure products perform under real-world conditions. With FM Approval, the M Series now offers:

• Streamlined acceptance by Authorities Having Jurisdiction (AHJs).
• Reduced delays during design, review, and inspection
• Confidence for engineers and contractors specifying the
• Peace of mind for end users, knowing the system is certified for reliability in protecting life and property.

“FM Approval confirms what our customers already know, that the M Series is a dependable, innovative solution for corrosion management in fire sprinkler systems,” said Ashley Villa, Marketing Manager.

Technical Flexibility

The M Series integrates seamlessly with supporting equipment such as:

• Model CTA Compressor/Tank Assemblies (UFS-352)
• Model IRD-42 Refrigerated Dryer (UFS-353)
• Model NR-60 Nitrogen Receiver (UFS-355)

Recommended clearances and dimensional options allow for flexible installation across a range of facility types, from smaller systems to large-scale applications.

Looking Ahead

For United Fire Systems, the FM Approval of the M Series reflects an ongoing commitment to developing solutions that not only meet industry standards but exceed them. The company remains focused on supporting engineers, contractors, and AHJs with tools that simplify design, ensure compliance, and deliver reliable protection.