High Flow Fire Extinguisher
Not all portable fire extinguishers are effective in extinguishing fires caused by flammable liquids. You must use a fire extinguisher approved for Class B and C fires, such as a high flow fire extinguisher.
A high flow fire extinguisher has twice the flow rate of standard fire extinguishers. These portable fire extinguishers are intended for applications where discharge rates exceeding one pound per second are required. The discharge rate is specified in NFPA 10.
They come in ABC, regular, or dry chemical rated for class B and C fires. Class B fires are defined as “flammable liquid gasoline, oil, grease, and all flammable gasses.” Class C fires are defined as “electrical fires or energized electrical equipment fires.”
High flow extinguishers are designed with a quick discharge rate enables the dry chemical agent to reach fires faster, providing increased firefighting capability as compared to a standard fire extinguisher. Applications include:
- Propane filling and storage locations
- Gas/fuel stations
- Construction sites
- Maintenance facilities
- Hazardous material cabinets
- Small paint booths
- Salvage/recycling centers
- Warehouses/storage facilities
Hazards requiring a high flow extinguisher involve two main characteristics: presence of pressurized flammable gas and opportunity for a three-dimensional fire to occur. A three-dimension fire is a Class B that includes a liquid in motion (for example, pouring or dripping flammable liquids).