Which class of standpipe is intended for fire service use and uses 2.5 inch hose connections?

• A. Class 1
• B. Class 2
• C. Class 3
• D. Class A

Answer: (A)

Standpipes are categorized by who uses them and the hose sizes they provide. The one intended specifically for fire department use and with 2.5 inch hose connections is Class I. These outlets are designed for firefighters to connect their own 2.5 inch attack lines, and there are no preattached hoses required for occupants. The 2.5 inch size matches the standard attack line hoses used by fire crews, enabling rapid, powerful flows when firefighters arrive on scene.

In contrast, the other common type for occupants uses smaller hoses (1.5 inches) that come preconnected, and another system combines both sizes to serve both occupants and the fire service, but without focusing exclusively on fire department use with 2.5 inch connections.