Possibly dumb question. Just picked up a 2003 Enviro Westport free-standing gas stove. It is designed as direct vent (4”/6” coaxial pipe). I want to test this thing out for a season and not have to modify my existing, roughed-in class A wood stove chimney. Can I just run some 4” single wall from the stove to the chimney ceiling flange and install a 4 to 6” adapter up there? Then just let the stove breathe interior air from the top of the stove fitting?