A system designed to allow a department to use 2.5 inch streams as well as providing 1.5 inch hose for occupant use prior to the arrival of the fire department.

A system designed to allow a department to use 2.5 inch streams as well as providing 1.5 inch hose for occupant use prior to the arrival of the fire department.

• A. Class I Standpipe system
• B. Class II Standpipe system
• C. Wet Standpipe system
• D. Class III Standpipe system

Answer: (D)

This type of standpipe is designed to serve both occupants and the fire department. It provides 2.5-inch outlets so the fire department can run large-caliber streams, and it also supplies 1.5-inch hose for occupants to use before firefighters arrive. That dual capability is the defining feature of a Class III standpipe system. The other options don’t fit: a system with only 2.5-inch outlets for the fire department lacks occupant-hose access, a system with only 1.5-inch hoses for occupants lacks 2.5-inch outlets for fire department use, and a wet standpipe describes the piping condition (always filled with water) rather than the mix of outlet sizes and user types.

This type of standpipe is designed to serve both occupants and the fire department. It provides 2.5-inch outlets so the fire department can run large-caliber streams, and it also supplies 1.5-inch hose for occupants to use before firefighters arrive. That dual capability is the defining feature of a Class III standpipe system. The other options don’t fit: a system with only 2.5-inch outlets for the fire department lacks occupant-hose access, a system with only 1.5-inch hoses for occupants lacks 2.5-inch outlets for fire department use, and a wet standpipe describes the piping condition (always filled with water) rather than the mix of outlet sizes and user types.