Which type of venting system must listed vented wall furnaces use?

Listed vented wall furnaces are specifically designed to be used with Type B-W gas vent systems. Type B-W vents are constructed to handle the specific flue gases produced by wall furnaces, ensuring a safe and efficient venting process. This type of venting is designed for appliances that burn gas and can operate at a maximum temperature of 480°F.

Using Type B-W vents helps to maintain proper draft and minimizes the risk of condensation within the venting system, which can lead to corrosive problems and unsafe operating conditions. Other types of vents, while they may be used for different appliances, do not provide the specific adaptations and construction required for the safe operation of listed vented wall furnaces. For instance, Type A vents are primarily for oil appliances, Type B vents for non-condensing gas appliances, and Type C vents are used for medium-efficiency appliances, which do not encompass the specific requirements for wall furnaces.