Mechanical foam fire extinguishers are a type of fire extinguisher commonly used to combat fires fueled by flammable liquids like gasoline, oil, and grease. They contain a special foam-forming solution that helps smother the fire by creating a barrier between the fuel and the oxygen in the air, effectively suppressing the flames.

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The basic design of a mechanical foam fire extinguisher includes a cylindrical pressure vessel filled with the foam-forming solution. They typically have a pressure gauge or indicator to show the pressure level inside the extinguisher. When activated by pulling the safety pin and squeezing the handle, the solution is expelled from the extinguisher through a nozzle or hose, allowing the user to aim the foam directly at the base of the fire.

These extinguishers are effective for Class B fires (fires involving flammable liquids) and are often found in environments where such fires are a potential hazard, such as kitchens, garages, workshops, and industrial settings. Regular maintenance and inspection are crucial to ensure the extinguisher remains functional in case of emergency.