What is the maximum venting temperature for Type B?

Type B Gas Vent is not rated for a specific temperature level, but this type of product should only be used on gas-fired equipment that has a draft hood or that was tested and listed for use with Type B Gas Vent systems. This type of equipment, such as furnaces, heaters, and water heaters, typically has an outlet temperature in the 400 F plus room temperature range. However, even if the temperature is correct, the instructions for the equipment should be checked to make sure it was tested for use with Type B Gas Vent.