Which type of standpipe system provides 2 ½" outlets for fire department use?

A Class I Standpipe System is specifically designed to provide 2 ½" outlets for fire department use. This type of standpipe is established primarily for the use of firefighters, allowing them to connect their hoses directly to the system. The larger size of the outlet is intended to accommodate the higher volumes of water needed during firefighting operations, making it essential for effective firefighting in commercial and high-rise buildings.

The design of the Class I system supports the efficient delivery of water to enable quick response and effective suppression of fire. Typically, Class I systems are installed in buildings where fire department access may be limited, ensuring that even if firefighters must navigate stairwells or other challenging environments, they will have the necessary infrastructure to draw water quickly and efficiently.

In contrast, the other types of standpipe systems serve different purposes. Class II systems are designed for use by occupants of the building, equipped with smaller 1 ½" outlets intended for use by trained personnel or building occupants. Class III systems combine features of both Class I and Class II, providing both 2 ½" outlets for firefighting and 1 ½" outlets for occupant use, while public fire alarm systems are not standpipe systems at all but rather systems designed to alert