Visibility and Variety: Make sure Visible alarms are sufficiently many and put strategically to be visible from all places. VADs, VIDs, and EN54-23 compliance may be puzzling, specially when you simply want to ensure that that you are keeping Everybody Harmless! If you're nevertheless Uncertain about what your developing may https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/