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This is the inside of the airlock, looking into the building. The first vertical pipe is the decontamination system, then you can see the blower housing (the blower itself and the motor are gone), a filter, pipe and the second filter. The large square object at the top rear left is the heat exchanger. The small diagonal pipe carried hot water for it, the second pipe in the loop is hidden behind the other equipment from this angle. Depending on how the valves were set filtered or straight outside air were fed to it. The hot water heating system could be used if needed, the forced air worked without it.

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