Back-drafting is a dangerous condition where combustion gases, such as carbon monoxide, are pulled back into the home instead of being exhausted through the flue. This often happens when the indoor air pressure becomes lower than the outside pressure, usually due to powerful exhaust fans or a clogged chimney. For owners of Mobile Home Gas Furnaces, ensuring proper venting is critical to prevent this health hazard. High-efficiency systems often use a Draft Inducer fan to create a positive outward flow of exhaust gases. If you suspect back-drafting, it is essential to have a technician inspect your Ducted heating system immediately. Proper installation of a Barometric Damper can help regulate the pressure within the vent pipe to prevent these occurrences. Ensuring your home has adequate "make-up air" is a primary defense against this potentially fatal indoor air quality issue.