Hi there. New to the pellet stove scene. I have an Osburn Hybrid 45 and just purchased excel 4" since I am going through a partition via a wall thimble, to a tcap, then up 6 feet to a 90, then out 8 feet through another thimble to the great outdoors. I have two questions. First, I am installing this in my finished basement, do I need to hook up the intake vent port, or can it simply draw air from the inside basement? And second, the ecel wall thimbles have lips on their outer edges. How have people installed this to the outside walls without the plate bending? Perhaps I am not understanding. Any help would be great. The guy that was supposed to install just had surgery and will not be able to install for me...