Business Sprinkler Alliance


How does a sprinkler work?

A sprinkler head comprises a thermal element and deflector plate on an automatic sprinkler system.

  • Sealing assembly

  • Frame

  • Temperature sensitive glass bulb

  • Deflector Plate

Each sprinkler head contains a valve that opens to release water when a heat-sensitive element reaches a pre-determined temperature. Usually this will be at least 68°C, however, sprinkler heads that operate between temperatures of 57–230°C are also available.
Sprinkler heads are located at ceiling height (or in racks or on walls depending on the type of premises protected) – around one for every 9–15m² – and connected to a water supply. Once a sprinkler head has been activated it delivers water directly onto the fire, dousing the flames and reducing the spread of fire.