Knowra Fire extinguisher Fire extinguisher A fire extinguisher is a portable device that releases an agent to suppress a fire. Its agent and delivery method determine which fires it can safely control.
Fire tetrahedron : A model of combustion as requiring heat, fuel, oxygen, and a self-sustaining chemical reaction. Extinguishers stop fire by removing or disrupting one or more of these four requirements.
Fire class : A classification of fires by the fuel involved, used to guide suppression methods and equipment. Extinguisher labels identify the classes their agents are intended to control.
Pressure vessel : A container designed to hold gases or liquids at a pressure substantially different from ambient pressure. Many extinguishers store propellant or agent under pressure inside a rated vessel.
Fire blanket : A fire-resistant sheet used to smother small fires or wrap around a person whose clothing is burning. Unlike a pressurized extinguisher, it covers a small fire directly without spraying an agent.
Fire extinguisher inspection : A check of an extinguisher's condition, accessibility, pressure, and service status. Inspection can reveal damage, obstruction, or loss of pressure before an emergency.
Water fire extinguisher : A fire extinguisher that uses water to cool burning materials, chiefly ordinary combustibles. Water suppresses many Class A fires by absorbing heat, but can spread burning liquids or conduct electricity.
Class A fire : A fire involving ordinary solid combustibles such as wood, paper, or cloth. Water-based and several multipurpose extinguishers are designed for these common materials.
Compressed gas : A gas stored at pressure above atmospheric pressure, reducing its volume within a container. Stored gas can propel an extinguishing agent through the discharge system.
Fire hose : A flexible hose that delivers water or another firefighting agent from a supply to a fire. A hose provides sustained flow for larger incidents, while portable extinguishers hold limited agent.
Fire extinguisher maintenance : Periodic servicing that keeps an extinguisher reliable and compliant with applicable requirements. Agents, seals, hoses, and cylinders may require professional servicing or replacement over time.
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