Which of the following is NOT a cause of poor foam generation?

The use of air-aspirating nozzles is not a cause of poor foam generation; in fact, these nozzles are specifically designed to enhance foam production. Air-aspirating nozzles introduce air into the foam solution, which helps to create a lighter, more effective foam that can better smother fires, especially those involving flammable liquids. The proper function of these nozzles allows for improved aeration and stabilization of the foam, leading to better fire suppression capabilities.

In contrast, poor-quality foam concentrate can introduce issues since it may not mix well with water or produce stable foam. Insufficient water pressure can hinder the nozzle’s ability to create the necessary foam expansion and can lead to ineffective foam application. Excessive agitation of the foam can also break down the foam structure, resulting in poor performance. Thus, the use of air-aspirating nozzles contributes positively to foam generation rather than detracting from it.