i'm getting ready to install our pellet stove in our basement. the foundation is not high enough above the ground to allow for the 12" clearance to the ground that the manual calls for, so we are going to have to go out through the foundation and then up the side of the house and use one of these diagonal like caps. it seems pretty straight forward to me, but there are a few things i'm not clear on. first, the piece that runs up the outside of the house, is it better for it to be shorter (1') or longer (3'-4') or does it not matter? also, how exactly do i anchor that exterior pipe to the house? i know there is the bracket, but must i find a stud to attach the bracket or....? any other bits of helpful info regarding this type of installation before i jump in?