Patent ID: 6418752
Filing Date: 2002-07-16
Classification: A62B,A62C,B01D

Abstract:
A system for providing breathable fire-preventive and fire-suppressive atmosphere in enclosed human-occupied spaces, said system comprising:an enclosing structure having an 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 into said internal environment so that said second mixture mixes with the atmosphere in said internal environment; said first outlet transmitting said first mixture to a location where it does not mix with said atmosphere in said internal environment; said internal environment selectively communicating with the outside atmosphere and emitting excessive internal gas mixture into the outside atmosphere; said intake gas mixture being ambient air taken in from the external atmosphere outside said internal environment.