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

Listed vented wall furnaces require a Type B-W gas vent system. This particular type of vent is specifically designed for venting appliances that operate on natural gas or propane and is suitable for use with wall furnaces, which can generate heat energy while also expelling combustion products safely.

Type B-W vents are constructed with a double-wall design, which allows for the safe passage of exhaust gases while maintaining a safe temperature on the outer wall to prevent fire hazards. This is crucial in residential settings, where wall furnaces may be installed in living spaces. The design of Type B-W vents helps prevent condensation from forming inside the vent, ensuring the efficient and safe operation of the furnace.

Other vent types, while useful in different contexts, do not meet the specific requirements for the performance, safety, and operational characteristics of vented wall furnaces. For instance, Type B vents are generally used for appliances that have lower flue gas temperatures, while Type L vents are suited for oil or solid-fuel appliances. Type C vents are designated for unvented appliances, making them unsuitable for any vented systems. Thus, Type B-W is the appropriate choice, aligning with the safety regulations and operational guidelines needed for wall furnaces.