If the foam being produced is poor quality, the firefighter should:

• A. Ventilate the area.
• B. Check to make sure there are no air leaks in the proportioning device.
• C. Increase foam concentrate flow rate.
• D. Switch to water application.

Answer: (B)

The main idea is that foam quality depends on getting the correct mixture of foam concentrate and water, as set by the proportioning device. If there are air leaks in that device, the mix can be disrupted—air can enter the flow or the concentrate flow can be misbalanced—leading to weak, uneven, or unstable foam. By checking for and repairing any air leaks in the proportioning device, the intended ratio is restored, and the foam achieves proper expansion, stability, and effectiveness.

Ventilating the area doesn’t fix the foam mixture itself. Simply increasing the foam concentrate flow rate can disrupt the ratio further if the device is leaking. Switching to water eliminates foam application and defeats the purpose when foam is required for the fire strategy.