VADs must produce sufficiently intense light so that an individual located anywhere in the space, looking either towards or away from the VAD, would be alerted in the event of an emergency. One challenge is the illumination of the entire volume of the open space where the alarm must be visible. As with other fire alarm system components, there are a number of challenges that must be considered in the layout, design and installation of VADs. ![]() The requirement for VADs will be identified as part of a risk assessment.
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