- Visual Alarm Device ("VAD")
A Visual Alarm Device ("VAD") is a type of alarm indicating device that is mounted on the façade of a building indicating the location of the designated building entry point. The purpose of a visual fire alarm device is to warn person(s) within, or in the vicinity of, a building of the occurrence of a fire emergency in order to enable such person(s) to take appropriate measures.
When an active alarm condition exists, the visual alarm device is activated the device emits a red flashing light. The flash rate of a VAD is between 0.5 Hz and 2 Hz of between pulses.