I'm adding a garage with living space above and will be putting a 1
1/2 ton heat pump in it. I'm trying to plan the duct work now. The takeoffs, register outlets, flex, and misc I realize I can get at my local hvac supply place or lowes. But do they have pre-fabricated plenums as well? Or do I need to find a sheetmetal shop that does that? Or just make my own from ductboard? I'd really rather have metal though.