I am working with a HUD program and the plumber says he cannot install a T or 90 degree on the exhaust coming out the roof. I used to work for a plumber and we installed 2 45 degrees to long sweep the 90 degrees.
I just want to know why it is not legal as the plumber was very rude about not installing it. If there is rule about it fine, if not he will be dropped from the HUD contractors we use.
I cannot find any rheem manulas online so I may have to go to a HVAC compnay and ask