If UL is going to change the conversation on the impact of smoke they need to change the chemistry of the water they use to put out a fire. When Firefighters apply plain, untreated water on open flame the flame turns back into smoke, only now the smoke is amplified by steam expansion that the heat produces after the water is applied. Water only impacts the heat of a fire and does nothing to extinguish the fuel and oxygen. The water sticks to the carbons in the smoke by adding an ounce of environmentally safe structural firefighting foam concentrate to every gallon of water causing the fire to extinguish 5 times faster. Chief Hughes Battalion 1 (ret) Chicago FD