sentences:  The use of fire sprinklers has been shown to mitigate the spread of fire by keeping the fire from growing to a size large enough to cause structural damage and break the exterior glass.If the building is not equipped with sprinklers, the fire can travel up the outside of the curtain wall if the glass on the floor of fire origin is shattered due to radiant heat, causing flames to lick up the outside of the building, resulting in the glass in floors above to break.Falling glass can endanger pedestrians, firefighters and firehoses below.