Other Devices: Depending on the program complexity, the FACP may acquire indicators from other gadgets like h2o flow switches in sprinkler devices. A fire alarm panel may be driving a door, providing the door is not locked plus the panel is just not obstructed. However, this isn't a encouraged practice, https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/