Tying stove into existing chimney pipe

[WhiteMike]

Putting a stove in a basement. There is a brick chimney with a stove pipe stubbed out of the side. I can't modify it. Going to come out of the stove and turn a 90 into the chimney. Any reason this would need to be twin walled pipe or can I just use regular?

 

[Mustang71]

Single wall 24 gauge pipe is fine. I believe there is a 18 inch clearance around the pipe to combistables.

 

[ChoppyChoppy]

Check local codes as well as home insurance. Some may require double wall.

Also 2 45s will flow better than a 90.