Put the old one back on and see what happens. I'd tell the apartment managers to explain how you physically damaged the ducts (you didn't). It's extremely unlikely there are any fire or zone dampers in an apartment that could cause that. How old is the complex?
The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....
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