I have a 3 story house and the wood stove is on the main floor. Total sq ft for the main floor and 2 bedrooms upstairs is 1800. I like the look of both the cape cod and the BK Ashford 30, trying to figure out which one would work best. My vent us double wall class 'A' pipe approximately 15 feet long. floor plan is open with 8 foot ceilings. Any advice would help, thank you.