Vahukustutid

Vahukustutid, also known as foam extinguishers, are a type of portable fire fighting equipment. They work by expelling a mixture of water and foam-forming agents onto a fire. This foam creates a blanket over the burning material, which cools the fuel and, more importantly, smothers the fire by preventing oxygen from reaching it.

The foam is typically delivered as a dense, viscous layer that adheres to surfaces, offering effective protection against re-ignition. Vahukustutid are particularly effective on Class A fires (ordinary combustibles like wood, paper, and textiles) and Class B fires (flammable liquids such as petrol, oil, and paint). They are generally not recommended for Class C fires (electrical fires) due to the conductive nature of the foam and water mixture, although specialized non-conductive foams exist for certain electrical applications.

These extinguishers are identifiable by their specific labeling, often indicating the classes of fire they are suitable for. They usually have a lever or trigger mechanism to activate the discharge. Maintenance is crucial to ensure they remain effective, typically involving regular pressure checks and internal inspections. The foam concentrate is mixed with water at the point of discharge or pre-mixed in some models. Their portability makes them a common sight in many public and private spaces, providing a readily available means of tackling initial stages of certain types of fires.