A recirculating air system with ducted and return air flow capacity of 3000 cfm serves one enclosed room. What automatic shutdown device is required?

A recirculating air system with ducted and return air flow capacity of 3000 cfm serves one enclosed room. What automatic shutdown device is required?

• A. No device is required
• B. Thermal cut-off
• C. Smoke detector
• D. Circuit breaker

Answer: (A)

Automatic shutdown devices are required only when stopping the system is necessary to prevent fire spread or to manage combustion-related hazards. A recirculating air system that serves just one enclosed room and does not handle combustion products does not create a fire or smoke control hazard that would require an automatic shutdown. In this setup, there’s no automatic shutdown device mandated by code for the system itself—the usual electrical protection like a circuit breaker remains the standard safeguard, and the motor may have built-in thermal protection as part of its design. Smoke detectors or thermal cut-offs aren’t required specifically for this simple single-room recirculation arrangement.

Automatic shutdown devices are required only when stopping the system is necessary to prevent fire spread or to manage combustion-related hazards. A recirculating air system that serves just one enclosed room and does not handle combustion products does not create a fire or smoke control hazard that would require an automatic shutdown. In this setup, there’s no automatic shutdown device mandated by code for the system itself—the usual electrical protection like a circuit breaker remains the standard safeguard, and the motor may have built-in thermal protection as part of its design. Smoke detectors or thermal cut-offs aren’t required specifically for this simple single-room recirculation arrangement.