Which standpipe type provides a 2½-inch hose connection and is intended for trained firefighters or fire departments?

• A. Class I Standpipes
• B. Class II Standpipes
• C. Class III Standpipes
• D. Class IV Standpipes

Answer: (A)

Standpipe systems are labeled by who is expected to use them and what hose sizes they provide. The description of a 2½‑inch hose connection intended for trained firefighters or fire departments matches the standpipe design that fire departments connect to with standard attack hoses. This type is built for professional use, with outlets large enough for firefighter hose lines and pumping equipment, rather than for building occupants.

The other standpipe types serve occupants or include both types of hoses, but they don’t fit the specific combination of a 2½‑inch connection plus exclusive use by trained firefighters.