Hello all, take about a wealth of info, this site is great. Ok just purchased a Earth Stove bv400c. The vent it 8 inches out of the top. The manual says flue size has to be 8 inch diameter which is 50 square inches minimum. It also says the flue collar should be no more than 154 inch square. mine is 10.5 x 15 which is roughly 157.5. I know this is alittle more but is it enough to need to reline? CHimney is in great shape tiled. it is a shorter chimney at about 12 feet. Just dont want to drop 500 bucks if i dont have to. Was thinking of block plating then running some rigid 4 feet past damper. Any advice would be greatly apprectiated.