About fire extinguisher
A fire extinguisher is a handheld, portable active fire protection device designed to control or extinguish small, contained fires in emergencies by spraying extinguishing agents like water, foam, or dry chemical powder. They work by disrupting the fire triangle (heat, oxygen, fuel), usually by cooling the fire or smothering it.
Key Aspects of Fire Extinguishers:
Purpose: Not for large, spreading fires. They are for immediate, small-scale emergencies.
Mechanism: They operate by cooling the fuel, removing oxygen, or interfering with the chemical reaction.
Types & Usage:
Water (Red label): Class A fires (wood, paper, plastic).
Foam (Cream label): Class A and Class B (flammable liquids) fires.
Dry Powder (Blue label): Multi-purpose for Class A, B, and C fires.
CO2 (Black label): Electrical fires; leaves no residue.
Wet Chemical (Yellow label): Cooking oil/fat fires (Class F).
Operation: Generally, the user removes a locking pin and squeezes a lever to discharge the agent, typically utilizing the PASS technique (Pull, Aim, Squeeze, Sweep).
They are essential safety equipment in homes, offices, and vehicles.