I. Introduction to Early Suppression Fast Response (ESFR) Sprinkler K202 (FM Approved):

The Early Suppression Fast Response (ESFR) sprinkler is a large-orifice sprinkler head, serving as a key component of automatic fire sprinkler systems. It functions both to detect fires and to extinguish them through automatic water discharge. In the early stages of a fire, it thermally activates quickly and automatically, delivering a specific impulse of water in a defined pattern and density over the designed protection area. It is a fire-suppression sprinkler head designed for early fire suppression. Featuring a fast-response fusible alloy, a large nozzle diameter, and an extensive deflector, its Response Time Index (RTI) is ≤28±8 (m·s)^0.5, providing advantages such as rapid fire response and high water flow rates. It is specifically engineered to combat high-hazard warehouse fires and is used to protect high-pile and high-rack storage facilities, as well as warehouses storing plastic products and mixed commodities.