These products are generally set up in structures as well as other constructions to warn occupants to the presence of a hearth also to facilitate evacuation. Installation in Higher-Sounds Parts: Set up visual alarms in areas wherever noise degrees exceed 90 dB(A) or wherever hearing security is often employed. Vids https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/