[mountainDIY]

I am working on finishing my basement. I am building a 4'X8' room to enlcose my furnace and water heater. The return ductwork for the furnace is currently snug against the concrete wall. Should this be re-worked so I can get framing and insulation and drywall behind the ductwork? This will be an expensive thing to do, but can be done. I want to build properly up to code.
Thanks.
MountainDIY