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This decontamination system is just inside the airlock door. By changing two synchronized valves filtered air blew out the holes in the pipe instead of going into the building. At the same time the intake for the whole system switched to the screened pipe just visible behind and to the right of the upper T fitting. In the other 3 gasproof structures at the Fort the intake is near floor level. Not the two pulleys just above the lower T fitting. Cables running through these would operate the valves in the pipes above to change the intake and exhaust of the air system.

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