What is one characteristic of non-aerated foam when operated from elevated master streams?

Answer: B — It has fast knockdown but doesn't create a blanket over the fuel

Non-aerated foam, when utilized from elevated master streams, is known for its fast knockdown capabilities. This characteristic is due to the foam's ability to effectively penetrate the fuel surface and extinguish flames rapidly. Unlike aerated foam, which is designed to create a stable blanket over the fuel, non-aerated foam tends to focus more on immediate fire suppression rather than providing long-lasting coverage. This means that while it can effectively extinguish flames quickly, it may not create the same protective layer over the fuel surface, which is crucial for preventing re-ignition. Thus, the speed at which non-aerated foam can knock down flames makes it particularly valuable in situations where rapid fire control is essential.