What is the hose diameter, in inches, used by most fire departments to extinguish larger fires?

The standard hose diameter used by most fire departments to extinguish larger fires is typically 2 ½ inches. This size strikes a balance between the ability to deliver a substantial volume of water while still being manageable for firefighters to handle. A hose of this diameter provides sufficient flow rate and pressure to combat larger blazes effectively, making it suitable for structural fires and other significant fire incidents.

Larger diameter hoses, such as 3 inches or greater, are often reserved for specialized use and may not be as versatile or practical for general firefighting tasks, particularly in urban settings where mobility and quick deployment are crucial. This is why 2 ½ inches is a conventional choice for attacking larger fires, as it facilitates a strong and effective water stream while still allowing for efficient maneuverability during operations.