What is the typical flow range for 1 ¾" attack lines?

The typical flow range for 1 ¾" attack lines is generally recognized to fall between 175 GPM to 185 GPM. This flow rate is optimal for providing a solid stream of water that is effective in suppressing various types of fires, particularly structural fires.

When using a 1 ¾" attack line, fire crews need a balance between maneuverability and sufficient flow for effective fire suppression. This range allows firefighters to have a powerful enough stream to combat the heat and flames effectively while still keeping the line manageable for a single firefighter or a small team.

Choosing a flow rate outside this typical range could compromise fire suppression efforts, either by not delivering enough water to extinguish the fire effectively or by causing fatigue and control issues if the flow is too high. The flow range reflects both the physical characteristics of the hose and the operational needs during firefighting scenarios, which is why this answer is considered the most accurate.