None of it actually was connected to the hvac system which was what ive come across alot searching the web. It was connected to the floor joists covering up piping, and knob and tube wiring.

My contractor and his workers all hate but love me as they are getting more hrs and days added because I'm making them take any metal sheets down very carefully in case they are more flat sheets. This came to my head just now tyoing how would someone get these in the first place back then and how di...

Thanks for the response. Do u have any idea or guesses for the time period. I also have some others ill upload as well and the first one i found the Shasta Cola from the Shasta water Company

Found this in my hotel basement. It was used as the ceiling and duct metal amd when we started do our remodel this and some Shasta Cola flat sheets were exposed. They arent in the best condition but what i want to kniw if possible is the age and reasons why they did a paint over so many times on the...