On my original Blaze King Ultra install March of this year,the installer went with a five and a half vertical rise then with a 90 through the wall about 20 inches horizontal then straight up 10 feet. Four previous stoves functioned flawlessly with regard to drafting. The King however is a different animal and I felt that it struggled for air at times during this mild burn season,especially when temps and humidity rose.So after complaining he's agreed to replace the 90 with 2'45's for a reasonable price considering the cost of double wall black pipe.This will be done tomorrow when temps will drop to 25 degrees. Did I make the right call on this. The problem was not significant but everywhere you look the BK likes 2'45's instead of 1 90 for optimal draft even their video states it.Will I notice a difference or with temps dropping or will it have been in vain,as we all know colder temps mean better drafting. As far as the install it is done according to code on the exterior as far as heights and clearances are concerned,but considering my chimney height for a King just makes the minimum requirement I figured go for it.Any feedback much appreciated.