If relevant, a releasing panel will activate relays to dispense pre-action sprinkler programs or Unique hazard suppression for instance a chemical agent or water mist on to the safeguarded Area. The difference between an FACP and annunciator panel is FACP is the key control device on the fire alarm process, https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/