How is a Class III standpipe system defined?

A Class III standpipe system is defined as a combination of Class I and Class II systems, which means it includes both 2.5-inch and 1.5-inch hose connections. This type of system is designed to serve the needs of both trained firefighters and building occupants. The 2.5-inch connections are typically intended for use by firefighters with higher flow and pressure requirements, while the 1.5-inch connections are geared toward building occupants or smaller firefighting teams who may not have advanced training.

The versatility of a Class III system makes it effective in a variety of emergency situations, allowing for flexibility in how water can be delivered to fight fires. The presence of both types of hose connections facilitates a quicker and more efficient response to different firefighting needs.