NFPA defines this as “a measure in the likelihood and severity of adverse consequences that final result from exposure to a hazard.” If there is nonetheless 15% oxygen within the home fire can still take place so extinguishing systems remain necessary. NFPA defines this as “a program or circuit conductor http://rowandtgtg.blogminds.com/new-step-by-step-map-for-fire-alarm-systems-8858629