Quote:
Originally Posted by glatt
OK, let me give out a big hint for anyone left playing.
There's tremendous airflow through that contraption on the side of the building.
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That big hint helped, I was getting nowhere before that hint. Searching for "vertical wind tunnel" did not help, it just gave lots of hits concerning indoor skydiving, but searching on "vertical brick wind tunnel" led to the TsAGI Central Aerohydrodynamic Institute in Moscow.