In a pre-incident plan for a commercial building, it is noted: 'The building features a Class B standpipe system with a single riser located in the north stairwell. Fire department connections (FDCs) are located on the Alpha side, easily accessible.' What type of standpipe system is indicated?

Question: In a pre-incident plan for a commercial building, it is noted: 'The building features a Class B standpipe system with a single riser located in the north stairwell. Fire department connections (FDCs) are located on the Alpha side, easily accessible.' What type of standpipe system is indicated?

Answer options:

• A wet standpipe system designed for occupant use. ✅ A dry standpipe system primarily for firefighter use.
• A combined standpipe and sprinkler system.
• A standpipe system for private security personnel only.

Correct answer: A dry standpipe system primarily for firefighter use.

Explanation: A 'Class B standpipe system' is not standard terminology. However, in Canadian contexts, 'Class I' refers to standpipes for firefighter use (2.5-inch outlets), 'Class II' for occupant use (1.5-inch outlets), and 'Class III' for both. Given Fire department connections (FDCs) are noted, and typical firefighter operations, the 'Class B' likely refers metaphorically to a system meant exclusively or primarily for specialized fire department operations, aligning with a dry standpipe system for firefighter use, which requires fire department pumping.