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I wondered about a water storage tank, too; but I don't think there is one. There could have been one in 1936, though. Every time I study the plans, I see something I missed before. I was wondering if there was a condensation problem on the outside of the ducts or if the wood was insulation...

Thank you all for answering. My friend intends to renovate this theatre. Of course, he will install a new, modern HVAC system, but I was just so curious about the original system. The drawings that he has just shows a "black box" with the air flowing through it. In 1936, what exactly would...

I have plans for a theatre built in 1936. These are architectural plans and the engineering is sketchy to say the least. The plans show outside air being drawn through an "air washing machine" and through a huge wooden duct to the auditorium. What the heck is this? Is it like a mini water...