I'm working on a new installation for a v3 f500. I need to drill a hole in the floor for the outside air kit, but the stove is not yet on site. Does anyone know how the center of the intake lines up with the center of the chimney outlet? I have a mark on the sub-floor that corresponds with the center of the chimney (plumb bob) and could measure from that. Eyeballing what pictures I've found, it looks like they may be coaxial.