GB/T 31540.5-2019

This standard provides engineering calculation methods and modeling guidance for predicting the movement of fire smoke and toxic gases within buildings. It is applied by fire safety engineers during the performance-based design of ventilation systems, smoke control strategies, and evacuation route planning in large or complex structures such as high-rise buildings, shopping malls, and tunnels. The standard ensures that smoke movement predictions align with Chinese regulatory requirements for life safety and property protection in fire scenarios.