Passive fire security building elements are accustomed to resist, retard and isolate flames and the linked smoke and fumes: they don't in themselves extinguish flames consequently They can be classed as 'passive security'. FireCell is based on “Hub & Cluster” technological innovation an EMS patented infrastructure which ensures most signal https://bookmarkeasier.com/story20324184/ems-firecell-wireless-fire-alarm-can-be-fun-for-anyone