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9.0 - Life support system
In the DeltagliderIV, crew breathe O2 and exhale CO2 back into the cabin. The missing O2 is replaced from the O2 tanks and the CO2 is eliminated by the CO2 remover. Total consumption of O2 and the amount of CO2 expelled is based on number of crew aboard and their heart rates. The N2 tanks replace air lost when you operate the airlock and repressurize the cabin when you set a higher pressure. They are much smaller than the O2 tanks.