What is the diameter of the fire hoses used in a Class I standpipe system?

In a Class I standpipe system, the diameter of the fire hoses specifically designed for this type of system is 2½ inches. This size is chosen because it is suitable for a variety of firefighting operations, allowing for a high volume of water to be delivered quickly to suppress fires. Class I standpipe systems are primarily intended for use by trained firefighters, so the larger diameter hose facilitates the flow needed for effective firefighting efforts, enabling firefighters to combat larger blazes and deliver adequate water pressure during emergencies.

Standpipe systems in buildings vary based on classifications, and Class I is distinct in its intended use for professional fire services rather than the general public. The focus on a 2½-inch diameter allows for the use of larger nozzles and hose connections, making it well-equipped to handle the demands of firefighting in commercial and high-rise buildings where fire safety measures need to account for the potential scale of fire incidents.