Passive fire security design parts are accustomed to resist, retard and isolate flames along with the affiliated smoke and fumes: they do not in them selves extinguish flames as a result they are classed as 'passive security'. Smoke detectors are the products and sensors which will realize possible fire threats. https://ragingbookmarks.com/story20454408/5-simple-statements-about-ems-firecell-wireless-fire-alarm-explained