We also use these cookies to know how customers use our companies (for instance, by measuring web-site visits) so we can make enhancements. Dr Zzeus Q&A: If fire alarm indicator devices do not fulfill the required standards, is the procedure compliant? This tiny factor has mighty issues going for it. https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/