Passive fire protection construction elements are accustomed to resist, retard and isolate flames plus the involved smoke and fumes: they don't in themselves extinguish flames hence They may be classed as 'passive defense'. Beneath, we’ll deal with many of the ins and outs of wireless fire alarm methods and ways https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/