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Overall view of the helmet's vent pad, which also served as a headrest. Picture 2 of 3. The astronaut could close a valve in the chest umbilical area to direct oxygen to flow from the suit's vent port and enter the helmet's vent pad, from where the oxygen would diffuse over the entire frontal area of the helmet, aiding in the dissipation of CO2 from the helmet area. | ||||
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