For interior fire attack, what is the typical diameter of hose used?

The typical diameter of hose used for interior fire attack is between 1.5 to 1.75 inches. This size is standard because it strikes a balance between the flow of water needed to effectively combat a fire and the maneuverability required in an interior environment. A hose of this diameter allows firefighters to deliver sufficient volume and pressure to extinguish flames while still being manageable in tight spaces, such as residential properties or commercial buildings.

Larger diameter hoses, such as 2.5 inches, while capable of delivering more water, are often less practical for interior attacks due to their weight and bulk, which can hinder movement and positioning during an emergency response. Conversely, smaller hoses, such as 1 inch in diameter, may not provide the necessary flow rates to suppress moderate to large fires effectively. Therefore, the 1.5 to 1.75 inch range has become widely accepted in firefighting practice for interior operations, as it provides the necessary performance without compromising agility.