Important Pellet Vent Pipe question-please read

I'd say the way you have it, is good to go.

Unless your locale says it needs lined? But many here run 3" into existing 6" Class A chimney.

Awesome! Thank you for your help.

I replaced my wood stove (it had 8" double insulated Metalbestos) with a pellet stove, and used a 4" to 8" adapter....works fine. No need to line the 6" pipe.

I do not know how cold it get's there but a 3" - 6" increase at -40 cause an inversion in the chimney where there is not enough hot air going up to keep a draft. Therefore the cold air in the chimney acts as a plug and the stove does not burn worth shid or it will go out cause there is no draft. Line the chimney and the problem goes away. Have done the liner many times after a person installs the stove themselves or a installer who does not know what required and there dealer who sold them the stove now's shid about draft at -40 or . Take your pick