Yeah, heated air. Those pipes could easily convey all of the steam, which would be far in excess of 20 KW of heat. So, let's think, think think: maybe those pipes were conveying steam not air.
And from the right vantage point, those white steam wisps constantly rising from the building (that don't show up in Google and that nobody has mentioned seeing) could also account for those white thingy's in the mezzanine window that look like cloud reflections in glass but aren't because Rossi said that's where he blew out all the heat and sucked in all the fresh air with his big electric fans (that were powered by a separate secret source because otherwise there would be more electric consumption than observed).
Did you have any Dictionary items to contribute?
Always good to have you around, IHFB.
And I do wish you an awesome Friday evening.