Hello, I just installed my new wood stove and am thinking about connecting an OAK. There is existing OAK ductwork that was professionally installed but the inlet terminates above the height of the wood stove which I heard could be a problem because of the possibility of draft reversal. The duct for the OAK is 3" and runs up the masonry chimney about 7 feet then exits out the back of the chimney into a upside down U shape that terminates upside down through the ceiling of the porch. My chimney liner is 35 feet and 8" in diameter. Would this work or should I forgo the OAK? Thank you!