Im in the process of changing my furnace and was wondering if the plenum has a serect formula to it? I dont have a furnace yet, but i was told thats the hard part cause it has to be custom made. I seen online where you can order a universal plenum in various sizes, would that do the trick?
Any info would be appreciated.
BTW, I have a pipefitter comming in to help do the gas part for me, im not crazy enough to touch that myself.