goducks10 wrote:
I'd leave the original exhaust and just block it off on the inside. No use making extra work. Just copy how the OEM exhaust is and repeat in a different location for the moved furnace.
The OP would still have to have the duct mounting plate that is OEM with the furnace. I'd assume this is the doubled vertical duct arrangement that is typical for circa 1994. This mounting plate has extruded pipe on the inside that accepts both the fresh air intake and exhaust pipe of the furnace.
Typical Suburban vent cap