LsFarm wrote:The combustion fan is feeding the fire and all the air going through the combustion fan goes up the chimney. If you can feed the combustion fan with outside air, you will no longer be putting a slight vacuum on your house and this will reduce the infiltration of cold outside air into your house.
It won't make the coal burn hotter, but your house won't be pulling in cold air through every crack and crevice around windows and doors.
I see makes sense. I guess I'll run it outside than. I was hoping to just use the cold air return. Thanks for your help..