Patent ID: 6314754
Filing Date: 2001-11-13
Classification: A62B,A62C,B01D

Abstract:
A system for providing a breathable fire-extinguishing environment for fire prevention and fire suppression in enclosed areas, said system comprising:an enclosing structure having internal environment therein containing a gas mixture which is lower in oxygen content than air outside said structure, and an entry communicating with said internal environment;an oxygen-extraction device having an inlet taking in an intake gas mixture and first and second outlets, said first outlet transmitting a first gas mixture having a higher oxygen content than the intake gas mixture and said second outlet transmitting a second gas mixture having a lower oxygen content than the intake gas mixture;said second outlet communicating with said internal environment and transmitting said second mixture to said internal environment so that said second mixture mixes with the air in the internal environment;said first outlet transmitting said first mixture to at location where it does not mix with the air in the internal environment;said internal environment selectively communicating with the outside atmosphere and emitting excessive internal gas mixture into outside atmosphere;said internal environment beg a breathable hypoxic air composition in human visited or occupied areas having oxygen content ranging front 12% to 18%.