I recently installed an Osburn 1800 insert - I'm very happy with it, but can feel the cold air being pulled in thru the far side of the house as it burns, even with the damper at its mosted closed level. Has anyone had any experience with using an outside air source? Any other ideas? My Chimmney does not have a vent in it already, but does have a cleanout. My basement is finished, but if I were to run a small vent thru the cleanout, I could probably vent it to the outside easier than chopping a hole thru my chimmney. Any advice would be appreciated. Also, to any Osburn 1800 insert owners, anything a rookie needs to know? Thanks.