PLSS (Portable Life Support System) during construction. I first made the wooden rig on the left to figure the system out- it was analogous to the handheld unit astronauts carried before entering the spacecraft. Water is pumped through the LCG (Liquid Cooling Garment) via a network of tubes (not the internet), and out to the box where it passes through a heat exchanger. The box also houses a fan to force air through the suit. Eventually the stuff in the box was transferred into the PLSS on the right.
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