Niagara A-B foam at 1.0% concentration is used for which scenario?

• A. Deep seated fires in furniture, smoldering ground fires, heavy duff
• B. Wildland/grass fires
• C. Structural firefighting with attached fog nozzles
• D. Protecting structural exposures

Answer: (D)

Foam used for protecting structural exposures is all about creating a protective barrier between the fire and nearby structures. A-B foam at 1% is designed to cling to exterior surfaces and form a cooling, insulating film that slows heat transfer and helps prevent ignition of walls, siding, windows, and contents on the exposure side while crews work to control the main fire. This makes it the best choice when the goal is to shield other parts of the building or nearby structures from heat and embers during an active fire. The other scenarios involve fires where you’re either trying to attack the fire itself (deep-seated or ground fires) or dealing with wildland fuels, where different foam practices and concentrations are used and the exposure-protection role isn’t the primary objective.