Is there a right or wrong way to face the plywood when building a soffit for ductwork? I was following a tutorial from Family Handyman http://www.familyhandyman.com/basement/how-to-finish-a-basement-framing-and-insulating/view-all
which has the plywood facing on the "inside" side of the duct.
Seems like almost all of the other tutorials I've seen, they have it on the outside, and they seem to use OSB instead. Is there a prefered side, and does it matter if using plywood vs OSB?