Which type of foam nozzle creates a low expansion foam?

A foam nozzle that creates low expansion foam is designed to mix foam concentrate with water and then discharge it in a manner that minimizes the amount of air introduced into the foam solution. This is crucial for achieving the desired characteristics of low expansion foam, which includes denser and more viscous foam production that is effective in suppressing flammable liquid fires.

The air aspirating nozzle operates by drawing in air as the foam solution passes through it, which creates a foam with a low expansion ratio. This design allows for better fluidity and coverage of surfaces, making it ideal for applications involving flammable liquids, where the goal is to create a thick, protective barrier over the burning material.

Understanding the specific characteristics of foam types is essential for effective firefighting, and selecting the appropriate nozzle based on the intended application helps ensure safety and efficacy in fire suppression efforts. The choice of air aspirating nozzles is especially relevant in environments with hazardous liquids, where a strong, stable foam blanket is required to prevent re-ignition and effectively extinguish the fire.