Exam Question

### (a) Carbon Dioxide (CO2) Flooding System for Engine Room
A fixed CO2 fire extinguishing system is a total flooding system designed to extinguish fires, primarily Class B (flammable liquids) and Class C (electrical), by displacing oxygen in the protected space. The principle of operation is to reduce the oxygen concentration from the normal 21% to below 15%, which is insufficient to support combustion.
The system components, as shown in the requested sketch, are as follows:
* **CO2 Room**: A dedicated, insulated, and well-ventilated compartment located outside the protected machinery space. It houses the main CO2 cylinders and associated equipment. The temperature is controlled to prevent over-pressurization of the cylinders.