I installed a Newmac add on wood furnace a few years ago beside an existing oil furnace. The plenum on top of the oil furnace is box shaped with the old holes covered up and new ducting added to it to connect it to the wood furnace. I'm wondering if I had a new plenum built that would be curved in hopes of improving air flow.
What do you all think of the plan?
What do you all think of the plan?