Passive fire protection construction elements are accustomed to resist, retard and isolate flames as well as associated smoke and fumes: they do not in by themselves extinguish flames for this reason they are classed as 'passive protection'. Smoke detectors are the gadgets and sensors that may realize opportunity fire threats. https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/