Passive fire defense design parts are accustomed to resist, retard and isolate flames plus the linked smoke and fumes: they don't in by themselves extinguish flames that's why They can be classed as 'passive protection'. Smoke detectors will be the equipment and sensors that can realize possible fire threats. There's https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/