Sealed doors are designed for ventilation and disaster prevention in underground mines, different from ventilation doors and windows which focus on "controlling and adjusting" airflow. These doors are primarily designed for complete isolation or temporary sealing without ventilation or passage functions, specifically for isolating hazardous areas in the mine, preventing the spread of disasters, and preventing air leakage. They serve as the final safety barrier for safeguarding miners' lives and mine safety production. Mainly used in areas such as voids, disaster zones, abandoned tunnels, etc., where passage and ventilation are not required. Their core functions revolve around disaster prevention, leakage control, risk management, and safety assurance. They are suitable for underground mine environments with high瓦斯 (gas) content, fire-prone, and risks of water seepage or explosion. The specific aspects include core safety protection, ventilation system management, and assistance in on-site operations.