What type of venting system shall be used for a listed vented wall furnace?

For a listed vented wall furnace, the appropriate venting system is Type B-W. This type of venting is specially designed for use with wall furnaces that are vented through a wall rather than through the roof. Type B-W vents are constructed to handle the temperatures and exhaust characteristics typical of gas appliances, including those that operate on propane or natural gas.

The design of Type B-W vents incorporates a double wall construction which provides adequate insulation to keep exterior surfaces cooler and reduces the possibility of heat damage to surrounding structures. The inner wall is typically made from aluminum or stainless steel, which is corrosion-resistant to accommodate the byproducts of combustion, while the outer wall is constructed to be more robust against environmental conditions.

Understanding this type of venting system is crucial for ensuring safety and efficiency in installations of wall furnaces, and it is based on specific codes and standards that govern gas appliance installations. Different vent types serve different functions, and Type B-W is tailored specifically for wall furnaces, making it the correct choice for this application.