How do I know what size B vent pipe should be used? How do I know what size B vent pipe should be used?

Determining the proper size of a B vent pipe requires taking several different variables into consideration. Some of these variables include the type of connector, air supply and the appliance’s BTU input. The vent system’s height and lateral offset must be considered in deciding on a size, as well. Contacting the manufacturer of the appliance or B vent pipe is the best way to decide on the proper sizing. Some manufacturers even offer helpful how-to guides to assist you in determining the proper size of B vent pipe for your specific circumstances. These guides will assist you in determining correct venting and chimney sizes for single and multiple appliance applications.

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