hey newbie here, just purchased a breckwell p23 pellet stove. I'm looking to install in my basement, my wall is half concrete, then wood. So I would have to do a 90 on the back, go up about 3-4ft then 90 out thru the wall. Is this ok? Do you think the 90 on the back of the stove is alright? All the manual shows is the pipe straight out of the back and out of the house. Thanks