What is the requirement for a type B-W gas vent in terms of its capacity?

The requirement for a type B-W gas vent is that it must have a listed capacity that is not less than that of the connected appliance. This means that the vent must be capable of safely handling the maximum flue gas output of the appliance to which it is connected.

Having a vent that meets or exceeds the capacity of the appliance is crucial for ensuring proper ventilation, preventing the buildup of harmful gases, and maintaining safe operation. If the vent is undersized, it can lead to backdrafting, inefficient appliance operation, or even dangerous situations such as carbon monoxide buildup.

This requirement ensures compliance with safety standards and regulations, as well as the efficient functioning of gas appliances. Thus, it is essential for the venting system to be appropriately rated for the connected appliance to ensure safety and efficiency.