Early fires usually originate from relatively small spaces or equipment interiors, and the smoke and temperature generated from them need a long time to spread to the smoke and temperature detectors at the top of the room or external space. By the time they respond, the scale of the fire has often expanded, causing serious losses; Meanwhile, fully submerged gas fire extinguishing also requires a certain amount of time for the fire extinguishing agent to enter the interior of the ignition space, which may further expand the disaster situation. Moreover, most of the fire extinguishing agents are accumulated outside the narrow space or equipment, causing serious waste and endangering the personal safety and health of personnel in the computer room. In response to this situation, our company has developed specialized fire extinguishing devices for small spaces, by installing detection and extinguishing devices inside small spaces or equipment to effectively improve the speed of fire detection and extinguishing. The gas fire extinguishing agent sprayed simultaneously is also directly released into the space, and the time required to reach the fire extinguishing concentration is much shorter than that of a fully submerged fire extinguishing system, greatly improving the speed and efficiency of fire extinguishing. It will not cause harm to personnel in the external space, and the required amount of fire extinguishing agent is greatly reduced, reducing the total cost and maintenance workload.