I am curious if anybody has done this: I want to run an uninsulated metal duct pipe, with a pex pipe attached to it. I was thinking I could use the devices made for attaching under wood floors. I will have enginered wooden beams between floors of my house, So I am thinking I could run this the length of the beams in one of the spaces, between two beams.
This would be the intake for my air exchanger. I live in an extremely cold climate.
