Exam Question

### (a) Fixed Foam Fire Fighting System: Explanation and Diagram
A fixed foam firefighting system is a permanently installed system designed to control and extinguish Class B fires (flammable liquids) in high-risk areas such as machinery spaces, boiler rooms, pump rooms, and on the decks of tankers. The system operates on the principle of creating a cohesive foam blanket over the surface of the burning liquid.
**Principle of Fire Extinction by Foam:**
Foam extinguishes a fire through a combination of three primary mechanisms: