20LB Amerex 332 - CO2 Fire Extinguisher - OEM

The Amerex 332 is a professional-grade, 20 lb Carbon Dioxide (CO2) fire extinguisher engineered for environments where collateral damage from extinguishing agents is as great a threat as the fire itself. In modern hospitals, telecommunication hubs, and electrical rooms, the corrosive dust of a multipurpose dry chemical extinguisher can permanently bridge circuits. The Amerex 332 solves this by utilizing pure, industrial-grade CO2 — a clean agent that vanishes instantly after discharge, leaving zero residue.

Rated 10-B:C, the Amerex 332 is specifically designed to tackle flammable liquid fires and energized electrical equipment. As the largest portable CO2 model in the Amerex lineup, it provides the extended discharge duration and massive gas volume required to flood large electrical cabinets. Built with a rust-free DOT-3AL aluminum cylinder and a heavy-duty all-metal valve assembly, the 332 is an indispensable safety asset for those requiring non-contaminating fire suppression for high-value infrastructure.

The Science of Suppression: Sublimation and Oxygen Displacement

1. Atmospheric Oxygen Displacement

Combustion requires a minimum of 16% oxygen to continue. When the Amerex 332 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 floor voids and server cabinets, providing deep coverage in enclosed electrical spaces.

2. The Snow and Sublimation

As the liquid CO2 exits the specialized non-conductive discharge horn, it undergoes a rapid pressure drop, turning into a mixture of gas and dry ice snow. This snow quickly sublimates — converting directly from solid to gas — absorbing massive amounts of thermal energy. While the primary suppression method is oxygen exclusion, this extreme cold provides a secondary thermal shock effect on the fire.

3. Dielectric Integrity (Class C)

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 — a core requirement for telecommunications fire safety and protecting high-voltage hubs.

Why the Amerex 332 is the Facility Director's Choice

• Zero-Residue Logistics: Following a discharge, there is no powder to vacuum and no corrosive film to remediate — critical for semiconductor clean rooms and hospital environments where contamination ruins expensive equipment.
• Capacity-to-Weight Ratio: The 20 lb agent capacity provides an extended discharge duration of nearly 15 seconds, giving the operator meaningful time to ensure full suppression.
• Rust-Free Aluminum Construction: Unlike steel units, the Amerex 332's DOT-3AL aluminum body is naturally rust-resistant, maintaining the professional appearance required for clinical and sterile environments.

The Amerex 332 is the primary choice for low-contamination hazard zones where specialized fire equipment is mandatory:

• High-Density Data Centers: Providing immediate protection for server racks without abrasive powder damage to circuitry.
• MRI and Medical Equipment Rooms: The standard for protecting imaging equipment where chemical residue is strictly prohibited.
• Electrical Control Rooms: Used near high-voltage panels and automated control systems for clean, zero-residue suppression.
• Scientific Laboratories: Protecting delicate glass apparatus and precision instrumentation from abrasive agents.
• Clean Manufacturing: Safeguarding robotic assembly lines and precision equipment from chemical contamination.

To maintain NFPA 10 compliance and ensure your facility remains insurance-eligible, the 332 must follow a strict maintenance protocol:

• Monthly Visual Inspection: Verify the safety seal is intact and the discharge horn is clear of obstructions. Confirm inspection tags are current.
• Annual Professional Service: A technician must verify the unit's weight. CO2 units are checked by gross weight — there is no pressure gauge, so weight is the only reliable indicator of a full charge.
• 5-Year Hydrostatic Test: Mandatory every five years for high-pressure CO2 vessels to ensure structural safety under the unit's high operating pressure.
• Confined Space Training: Because CO2 displaces oxygen, personnel must be trained in oxygen deficiency safety protocols before working in enclosed spaces where the 332 may be discharged.

Why choose the 20 lb unit over the 10 lb model?

While both are clean agents, the 20 lb CO2 extinguisher provides nearly double the gas volume. This is often required by fire marshals for large electrical vaults or significant server room footprints where the 10 lb unit may not deliver enough agent volume to fully flood the hazard zone.

Is this safe for sensitive sensors and circuit boards?

Yes. CO2 is non-abrasive and will not scratch optical lenses or bridge circuit board traces the way dry chemical powder can. After discharge and ventilation, equipment can often be inspected and returned to service without the extensive cleanup required after a dry chemical event.

How do I use this unit safely in an emergency?

Use the PASS method: Pull the pin, Aim the discharge horn at the base of the fire, Squeeze the handle, and Sweep from side to side. Always grip the insulated handle on the discharge horn — never the horn itself, as it reaches approximately -110°F during discharge and will cause frostbite on contact.