The Application of ‘Sub-safe Area’ in the Performance-Based Fire Protection Design

‘Sub-safe area’ is a place relative to the safe area outside which ensures the personnel not affected of fire in the building. With the application of performance-based in the fire protection design, ‘sub-safe area’ was used more and more by the designer. The article defined the conception of ‘sub-safe area’, putted forward the requirements of fire protection design, and explained the application of ‘sub-safe area’ via an example.