What are two types of fixed fire-fighting systems?

The correct answer identifies two specific types of fixed fire-fighting systems that are integrated into buildings and vessels to automatically suppress fires. Sprinkler systems are a widely recognized fixed system that delivers water to extinguish fires when heat activates the sprinklers. They are strategically placed throughout a structure to provide coverage and are an essential component of fire protection.

CO2 flooding systems, on the other hand, utilize carbon dioxide to displace oxygen in the area being protected. This system is particularly effective in spaces with high-risk machinery or hazardous materials, where water damage must be minimized or where traditional extinguishing agents may be ineffective. CO2 systems automatically release the gas in response to fire detection, making them an efficient method for fire suppression in specific environments.

In contrast, water hoses and foam dispensers, while effective in certain firefighting situations, do not qualify as fixed systems because they generally require manual operation. Smoke detectors and alarms are focused on fire detection rather than suppression, serving as early warning systems. Portable extinguishers and fire blankets are also not fixed, as they are designed for manual use and are intended for immediate response by personnel rather than automated suppression.