Patent ID: 7207392

Claim:
A method for providing a breathable hypoxic hypercapnic fire-prevention atmosphere in a computer room, warehouse and other occupied facilities, such method comprising: making said room substantially airtight by minimizing its leakage rate; utilization of an air separation apparatus for separation of the internal atmosphere of said room into oxygen enriched and oxygen depleted fractions; extracting said oxygen enriched fraction out of said internal atmosphere and transmitting it to a location where it does not mix with the internal atmosphere; said apparatus producing the oxygen enriched fraction having carbon dioxide content below 0.035% and said oxygen depleted fraction having carbon dioxide content greater than 0.035%; releasing said oxygen depleted fraction inside said room so it mixes with said internal atmosphere and depleting it until a desired breathable hypoxic hypercapnic environment is created having fire-preventative quality; diluting said breathable environment with ambient atmospheric air entering said room; maintaining automatically the oxygen content in said breathable hypoxic hypercapnic environment in a range greater than 12% and below 18%.