Need some advice – going to be replacing my majestic pre-fab with an Englander 30-nch. The majestic prefab is connected to an 8” double wall straight vertical liner. It was inspected last year and is in great shape. The Englander is a 6”outlet. I’m planning on running 6” double wall pipe to the first floor and then I’d like to know if I can transition to that 8” liner and reuse it through the rest of my chase and out the roof or do I need to purchase a new 6” liner?