Which standpipe class is intended for use by professional firefighters and features 2 1/2 inch hoses?

The standpipe class intended for use by professional firefighters is Standpipe Class I. This class is specifically designed to provide hoses that are 2 1/2 inches in diameter, which allows for a higher flow rate of water, suitable for combating large fires or situations that require a significant amount of water to be delivered quickly. Class I standpipes are typically located in commercial and industrial buildings and are not intended for use by the general public. Instead, they are equipped for firefighter use, which aligns with their requirement to connect larger hoses and handle greater volumes of water efficiently.

Other classes, such as Standpipe Class II, feature 1 1/2 inch hoses and are intended for use by trained personnel or occupants of the building rather than firefighters. Standpipe Class III combines features of both Class I and Class II, providing both 1 1/2 inch and 2 1/2 inch connections, but its primary purpose is to serve both fire department personnel and trained building occupants. Wet standpipe systems refer to the type of system itself (where water is kept in the pipes at all times) rather than the classification of standpipes. Thus, Standpipe Class I is the correct classification for professional firefighter use with 2 1/