I was shortening a circular duct in my bathroom and when cutting it I uncoupled it from the main. I went in the basement and the wall and pvc to the radon system are in the way. On the other side is the main return ductwork.
I'm a small enough person to crawl between the joists but I would have to put my weight on the return main... Is this strong enough? Otherwise I'll have to poke through the ceiling to repair it.