I just bought a mid 80's Jotul 8 with the wheel air intake on the door. The outlet on the stove measures something around 7". This will be a new install in my house so I need to install a Metalbestos chimney. I'm wondering what size chimney I should install. Should I go 8" and then somehow reduce it down to 7" going into the stove? Do they make a reducer to go from 8" to 7"? I want to install this chimney once and have some room to grow later if I want a little bigger stove. What do you pro's recommend? Thanks, Jeff.