Which foam application method involves deflecting the foam stream off a surface so the blanket flows down and back over the fire?

Which foam application method involves deflecting the foam stream off a surface so the blanket flows down and back over the fire?

• A. Sweep method
• B. Flow back method
• C. Bankdown/bounce-off method
• D. Rain down method

Answer: (C)

Deflecting the foam stream off a surface to create a blanket that flows down and back over the fire uses the bankdown/bounce-off method. By aiming the nozzle at a surface such as a ceiling or wall, the foam is deflected and fans out, forming a broad curtain that blankets the fuel as it runs downward and back over the fire. This pattern gives rapid, wide-area coverage and helps cool and smother the fire from above, which is especially useful when direct reach to the burning fuel is limited. Other techniques deliver foam in different patterns—sweeping moves spread foam across an area, rain-down drops foam vertically to blanket from above, and flow-back patterns move foam back over the fire from another angle—without relying on a deliberate deflection to produce the downward-backward blanket like bankdown/bounce-off.

Deflecting the foam stream off a surface to create a blanket that flows down and back over the fire uses the bankdown/bounce-off method. By aiming the nozzle at a surface such as a ceiling or wall, the foam is deflected and fans out, forming a broad curtain that blankets the fuel as it runs downward and back over the fire. This pattern gives rapid, wide-area coverage and helps cool and smother the fire from above, which is especially useful when direct reach to the burning fuel is limited. Other techniques deliver foam in different patterns—sweeping moves spread foam across an area, rain-down drops foam vertically to blanket from above, and flow-back patterns move foam back over the fire from another angle—without relying on a deliberate deflection to produce the downward-backward blanket like bankdown/bounce-off.