I am installing a eco-Cab-50. It is being installed in a corner. My exhaust is threw the wall. I have from the stove a 45 then a 36" straight and a 24" straight then a turn down term. cap. So I have 5' of straight pipe. The manual says not to go over 48" of horizontal pipe. I was hoping to use what I have so the exhaust is away from the house. Will I have problems going to long Horizontal? I am planing on later (next year) going out and up, just trying to get this year in.