For exposure protection, what hose size should be used according to Chicago Fire Department guidelines?

The recommended hose size for exposure protection according to Chicago Fire Department guidelines is 2½-inch hose. This size is favored because it strikes a balance between manageable weight and sufficient water flow. In exposure protection scenarios, where the goal is to apply water effectively to prevent the spread of fire to nearby structures or combustible materials, the 2½-inch hose provides a robust stream that can cover a larger area and penetrate further than smaller hoses.

Additionally, the 2½-inch diameter allows for the delivery of a higher volume of water while still being operable by firefighters working in potentially hazardous environments. This makes it an ideal choice for creating a defensive stand against fire spread and ensuring that enough water can be provided where it's needed most.

Larger hoses, while capable of delivering more water, can become cumbersome and more challenging to maneuver, especially in urban environments where access may be limited. Therefore, the 2½-inch hose is the standard for exposure protection in the Chicago Fire Department’s operational guidelines.