Finally tested building in the new oral-nasal mask, which routes breathing gas into my lungs from the supply outside the suit, then out of my lungs, and out of the suit (carrying away carbon dioxide) through the exhale valve / hose. The mask has a better seal than the one I built (over several months) but was never entirely confident about. A couple of adjustments to make, but I feel a lot better with this system. Bottom photo shows helmet's internal sun visor in the down position. Not shown is the mylar uv/ir visor cover that I'll build onto the outside of the visor.
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