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Emergency Power Supply

A secondary source of electrical power independent of the primary power supply, used to power the fire alarm system in the event of primary failure–usually batteries and/or an emergency generator.

End-of-Line Resistor

A resistor installed at the end of a device wiring loop to establish a supervision current back to the control unit.

EVAC (Emergency Visual Audio Control)

A centralized operator unit for monitoring and controlling fire emergency situations, with appropriate switches, LEDs, common controls, graphic annunciation, and fan and damper controls.

Exhaust Fan

As part of the air handling or smoke control system, an exhaust fan evacuates the air from the area serviced by the ventilation system to the outside of the building.

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