Hello all, we recently moved into a new home which was outfitted with a wood burning stove in the unheated basement. At night, an hour or so before bed we will open the air intake fully to burn any additional logs and coals as best as possible. In the morning, irregardless of whether the air intake is open or closed, we will get low levels of CO in the basement. Not enough to set off the alarm, but still a cause for major concern. My gut tells me that as the stove temp dies down, the draft begins to downdraft when the boiler kicks on. There are still small coals burning and creating our CO condition. We plan on installing an outside air vent and duct to the near the boiler to help alleviate the need for the boiler to pull down the stove chimney. As your fires die down over night and the heat is not enough to induce a draft, are your stoves tight enough to keep any harmful gases in the stove and not allow leakage back into the space? We have had the boiler looked and the fire department surveyed and said everything was fine, but I am hoping to get some insight from you folks. In the meantime the stove will stay off.