Which system is needed to ensure proper smoke control in corridors?

An approved smoke control system is essential for ensuring proper smoke control in corridors, primarily because it is specifically designed to manage and mitigate smoke movement during a fire event. This kind of system works by either pressurizing areas to prevent smoke infiltration or by providing designated pathways for smoke to escape, which is crucial for maintaining safe egress routes for occupants. In addition to maintaining visibility and reducing smoke inhalation hazards, it helps in managing the smoke layer within a space, ensuring that it doesn't accumulate in corridors where people may need to evacuate.

Other systems, such as fire alarms, sprinklers, and HVAC systems, have their own critical roles in fire protection and building safety. A fire alarm system detects smoke and alerts occupants, while a sprinkler system suppresses flames but may not address smoke movement directly. The HVAC system can be used to assist in smoke control if integrated properly, but it is typically not solely responsible for that task without an approved smoke control component in place. Thus, the designation of an approved smoke control system as the necessary component emphasizes its specialized function in maintaining corridor safety during emergencies.