Our current thinking is to carry an air bottle, and intentionally let the cabin leak a bit to force some air circulation, dehumidification, and cooling. There will also be a hand-operated valve to force it to leak more if you want to clear the air up any.We ran a similar exercise here for Armadillo's life support system. We concluded that they didn't need one. The flight is so short, and the cabin so large, that CO2 levels won't rise to uncomfortable levels during the flight even if they don't scrub the air. We also determined that dumping the air overboard and replenishing it from on board tanks was simpler than scrubbing it, since they're going to bring the tanks along anyway, for redundancy.-R
John Carmack
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