is a prototype of the P.A.L.S.S. box. It shows the water pipe
entering through the top of the ceiling. The polymer crystals are
stored in the tank. They are the size of fine sand.
The fill valve is used to refill the polymer tank. The heat and
smoke sensor is responsible for starting the system. During a
fire, the water enters the tank and forces the polymer to expand to
1,000 times its size. The sprinkler head sprays out hydrated
polymer crystals onto the fire.