Which nozzles make flowing a 2 ½ in attack line more challenging?

Flowing a 2 ½ inch attack line can indeed be more challenging with fog nozzles. The primary reason for this is that fog nozzles disperse the water into a fine mist, which increases the surface area of each water droplet. While this can be beneficial for cooling and fire suppression in certain scenarios, it also means that achieving effective reach and penetration in a defense against the fire can become complicated. The fine droplets can be more easily disrupted by wind and thermal conditions, sometimes resulting in diminished effectiveness.

In contrast, solid nozzles deliver a concentrated stream that penetrates the fire more effectively, making it easier to target specific areas. Combination nozzles offer versatility, allowing for both straight stream and fog patterns, thus providing some benefits to adaptability in various fire situations. Breach nozzles, although not commonly referenced, would not typically apply to the challenges associated directly with flowing larger attack lines.

Overall, while fog nozzles have their appropriate uses, they can introduce complexity when operating larger diameter lines like the 2 ½ inch attack line, primarily due to their water dispersal characteristics.