Any help please ,,,I have a wood stove in my barn that we had just installed and everytime you open the door the room becomes smokey. the pipe size is 6" coming out the back of stove then a 90 going up approx 4' then a 90 and approx 2' to exit the wall and a 90 to go up the outer wall with a total of 10' of pipe with approx 4' past the roof top