There are three main parts to a clean agent fire suppression system: smoke detectors, a control panel, and notification devices. The smoke detectors work as expected and detect a fire in its early stages, before it has time to become uncontrollable. Detectors send a signal to the control panel, which alerts system notification devices which alerts occupants of a fire and that the clean agent is about to be released. The suppression system is then activated, and the agent is released. The most common types of clean agent fire suppression systems are FM-200, NOVEC 1230, and Inergen because they all use gases that are safe for the environment and humans.