Stove...stoves are considered exempt equipment, meaning, they do not have to be vented. This implies that they are not a risk, but they are. The exhaust from stoves mix with the air in the living space and is thus diluted. When a stove is used to heat the environment, excess quantity of CO may leak out and pose a threat. A stove or a cooktop should be used to cook and never to heat the room. When used, a window should be opened to provide fresh air to help dilute the potentially toxic gases.