Air-Distribution Systems are generally required to have at least how many means to manually shut down the system?

Air-Distribution Systems are generally required to have at least how many means to manually shut down the system?

• A. Two
• B. One
• C. Three
• D. Four

Answer: (B)

A single, clearly identified manual shutoff for the air-distribution system is the baseline. Having one accessible control point lets occupants or responders quickly stop the system to limit airflow and potential smoke movement during a fire or incident, reducing delays and confusion. While additional shutdowns can exist for zoning or convenience, they aren’t required for the whole system, and extra shutoffs can complicate operation or become inaccessible in an emergency. The key is a readily reachable, well-marked shutoff location that can be used to promptly isolate the system.

A single, clearly identified manual shutoff for the air-distribution system is the baseline. Having one accessible control point lets occupants or responders quickly stop the system to limit airflow and potential smoke movement during a fire or incident, reducing delays and confusion. While additional shutdowns can exist for zoning or convenience, they aren’t required for the whole system, and extra shutoffs can complicate operation or become inaccessible in an emergency. The key is a readily reachable, well-marked shutoff location that can be used to promptly isolate the system.