What is the minimum vertical height Type B-W gas vent should terminate above the bottom of a wall furnace?

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The correct minimum vertical height for a Type B-W gas vent to terminate above the bottom of a wall furnace is indeed 12 feet. This height is specified to ensure that the vent operates effectively and safely, maintaining proper airflow and preventing the potential for backdraft or spillage of combustion gases into the living space. A height of 12 feet above the bottom of the wall furnace helps to create sufficient draft, which is crucial for the efficient operation of the furnace and the venting of exhaust gases.

Inadequate vent height could lead to issues such as inadequate draw and increased risk of carbon monoxide entering the building, making adherence to regulation essential for safety. This specified height is part of guidelines established by safety standards and local building codes, which are designed to ensure that installations minimize hazards associated with gas appliances.

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