New here and thankful for an opportunity to discuss my dillema. Want to install a wooburning stove in the basement of my home. I currently have a pre-exisitng double walled chimney in place that was installed for the purpose of connecting to a prefrabricated fireplace. The current double wall, (8 inch inside a 12 inch either galvanized steel or aluminum?), runs through a wood framed, stone veneer enclosure which serves as the prominent feature on the exterior of the home and ends just beneath the floor joists into a concrete alcove of the basement begins. The woodstove of course sits on a concrete basement floor in this same alcove. The alcove is 36" X 50" and 9 feet tall. In other words I have three 9 ft tall walls forming an alcove where the stove will sit. Directly above this I have the exisitng double wall originally installed to accomodate a prefab that starts where the concrete ends and ends 4 feet above the peak of the roof and is encased in a wood framed stone veneered "chimney". Question: Can is run a 4 inch flexible liner inside the exisitng double wall and connect directly to the wood stove? I have a similar set up on the main floor fo the house where I placed an insert into a prefrab and used a liner to vent it. Why wouldn't the same apply to this installment. Everything I have read recommends a class A only, however I do not know how it would be possible to install a class A and support it inside the exisitng wood framed structure without tearing everthing apart.