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How does the Colorado Exercise Room (CER) simulate altitude?
A
The altitude simulation is created by decreasing the percentage of oxygen in the air.
The air unit pumps in air that is 13% oxygen, which mixes with normal 21% air.
It is then monitored by the controller, which contains an oxygen sensor that keeps the percentage of oxygen at the desired equivalent altitude (usually 9000 feet).
CAT uses a blow through system instead of recirculation, which creates a constant flow of fresh air.