What is the maximum diameter of a small handline hose (SDH)?

The maximum diameter of a small handline hose (SDH) is defined as 2 inches. This classification is crucial because it determines the hose's suitability for different firefighting applications. A small handline hose is designed to be lightweight and manageable for firefighters, enabling them to maneuver effectively in various situations, especially in wildland and structural firefighting scenarios.

A 2-inch diameter allows for adequate water flow while remaining easy to handle, providing the right balance between attack capabilities and operational efficiency. This size is often utilized for initial attack lines or in scenarios where the fire's intensity requires a focused but controllable stream of water.

Hoses with diameters larger than 2 inches typically fall into different categories, such as large-diameter hoses, which are designed for higher water volumes and are less manageable for close-quarter firefighting operations. Understanding these classifications helps firefighters make informed decisions about which equipment to deploy based on the fire's needs and the operational environment.