I recently purchased an older model blaze princess that I'd like to install in my home. The opening at the top is 8" and I'd like to know if I can reduce from an 8" to 6" at the top of the woodstove, and take the 6" the rest of the way out. It seems to be easier to find the 6" than the 8". (I'm installing double wall pipe due to clearance) I also would like to know anyones opinion on duravent vs superpipe.