Supplementary to Audible Alarms: VADs are specifically efficient in high-sounds regions or in which hearing security is worn, supplementing classic audible alarms. In order to avoid discrimination, BS EN fifty four-23 compliant VADs may very well be put in in all sanitary accommodation (not merely WCs) and all lodge bedrooms, https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/