What is a defining characteristic of a type B-W gas vent?

The defining characteristic of a type B-W gas vent is that it must have a listed capacity not less than that of the furnace it is connected to. This ensures that the vent can safely handle the exhaust gases produced by the appliance, allowing for proper venting without the risk of overheating or backdrafting, which could lead to dangerous situations.

Having a vent with adequate capacity is crucial for maintaining safety standards and compliance with building codes, as undersized vents can lead to carbon monoxide buildup in the living space. Properly matching the vent capacity with that of the furnace supports efficient performance and helps to safeguard the health and safety of occupants.

The other options may describe characteristics of different types of vents or installations but do not specifically define the unique requirements associated with a type B-W gas vent. Thus, understanding the significance of matching vent capacity to the connected appliance is vital for safe and efficient propane gas installation.