15LB Amerex 331 - CO2 Fire Extinguisher - OEM

The Amerex 331 is a high-performance, 15 lb Carbon Dioxide (CO2) fire extinguisher designed for environments where "collateral damage" from extinguishing agents is as great a threat as the fire itself. In modern laboratories, telecommunication hubs, and electrical rooms, the corrosive dust of a standard fire extinguisher can permanently bridge circuits and destroy sensitive sensors. The Amerex 331 solves this by utilizing pure, industrial-grade CO2—a clean, non-contaminating agent that vanishes instantly after discharge, leaving zero residue.

Rated 10B:C, the Amerex 331 is specifically engineered to tackle flammable liquid fires and energized electrical equipment. As the mid-sized powerhouse in the Amerex CO2 lineup, it offers significantly more "stay-power" than smaller models while remaining light enough for manual deployment. Built with a rust-free aluminum cylinder and a heavy-duty all-metal valve assembly, the 331 is an indispensable safety asset for those requiring commercial fire protection in high-tech zones.

The Science of Suppression: Sublimation and Oxygen Displacement

1. Atmospheric Oxygen Displacement

Combustion requires a minimum of 16% oxygen to continue. When the Amerex 331 is activated, it floods the hazard zone with a concentrated cloud of CO2, rapidly dropping the local oxygen level below the threshold of combustion. Because CO2 is 1.5 times heavier than air, it "sinks" into electrical cabinets and under floor voids—a capability frequently noted for protecting server rooms and data centers.

2. The "Snow" and Sublimation

As the liquid CO2 exits the specialized discharge horn, it undergoes a rapid pressure drop, turning into a mixture of gas and "dry ice" snow (at approximately -110°F). This snow quickly sublimates (turns directly from solid to gas), absorbing massive amounts of thermal energy. While the primary method is smothering, this extreme cold provides a secondary cooling effect, making it an ideal electrical fire extinguisher for preventing thermal runaway in overheated hardware.

3. Non-Conductive Dielectric Strength

Carbon Dioxide is naturally non-conductive and non-corrosive. This allows an operator to safely engage fires in live 480V panels or medical imaging equipment without the risk of an electrical "flashover." This safety margin is a key focus of fire safety education for personnel working in telecommunications and high-voltage hubs.

Why the 15 lb Amerex 331 is the "IT & Lab Manager's Choice"

• Zero-Residue Logistics: Following a discharge, there is no powder to vacuum and no corrosive film to remediate. This is critical for laboratory fire safety where post-fire cleanup could contaminate delicate experiments.
• Strategic Capacity-to-Weight Ratio: The 15 lb agent capacity provides an extended discharge duration (nearly 15 seconds). This extra "soak time" is critical for ensuring a fire is fully extinguished.
• Rust-Free Aluminum Construction: Unlike steel-bodied units, the Amerex 331's aluminum body is naturally rust-resistant. This ensures the unit maintains its integrity even in humid mechanical rooms.

The Amerex 331 is the primary choice for "Low-Contamination" hazard zones where firefighting equipment must be surgical in its application:

• Hospitals & Medical Rooms: Protecting surgical lasers where chemical residue is prohibited.
• Laboratories & Research: Protecting delicate glass apparatus from the abrasive "cloud" of dry chemical agents.
• Electrical Control Rooms: Used near high-voltage panels and switchgear for a "clean" kill.
• Telecommunications Hubs: Essential for protecting switching gear where continuity of service is the primary metric.
• Clean Manufacturing: Safeguarding automated control systems from chemical contamination.

Manufacturer	Amerex Corporation
Model	331
Agent Type	Carbon Dioxide (CO2)
Capacity	15 lbs (6.8 kg)
UL Rating	10B:C
Cylinder	Rust-Free Aluminum

To maintain NFPA 10 compliance and ensure insurance eligibility, the 331 must follow a strict maintenance protocol:

• Monthly Visual Inspection: Verify the safety seal is intact and the discharge horn is clear. Ensure the fire safety sign for CO2 is present.
• Annual Professional Service: A technician must verify the unit's weight. CO2 units are checked by "Gross Weight," a process different from checking gauge-style units.
• 5-Year Hydrostatic Test: Mandatory every five years due to high storage pressures. This is a vital check conducted by any fire protection company.
• Confined Space Warning: Because CO2 displaces oxygen, operators must ventilate the area immediately.

Where can I find fire extinguisher sales and service for CO2 units?
You should visit a specialized fire equipment store or an authorized Amerex dealer to ensure your 15 lb units are properly weighed and hydro-tested.

Is this a Class ABC fire extinguisher?
No. It is a B:C rated unit. While it can knock down flames, it is not a Class A fire extinguisher and will not prevent re-ignition in wood or paper fires.

How do I use the PASS method fire extinguisher technique on this unit?
The PASS acronym for fire extinguisher use remains: Pull, Aim, Squeeze, and Sweep. However, ensure you do not touch the discharge horn during the process to avoid frostbite from the extreme cold.