Clean agent systems are fire suppression systems that use gases or vapor-based agents to extinguish fires without leaving residue. Unlike traditional water-based systems, they are designed to protect sensitive equipment and valuable assets, making them ideal for areas like data centers, museums, and archives. These systems work by displacing oxygen or interrupting the chemical reaction of a fire. Common clean agents include FM-200, Novec 1230, and Inergen. They are safe for use in occupied spaces, allowing for quick evacuation while effectively controlling or extinguishing fires.