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

The minimum vertical height for a Type B-W gas vent above the bottom of a wall furnace is established to ensure proper venting and safety. A height of 12 feet is specified to create adequate draft and to prevent any backdraft from potentially hazardous combustion gases. This distance helps to ensure that the exhaust gases rise sufficiently and disperse into the atmosphere without re-entering the structure.

While other heights may be appropriate in different contexts or for different vent types, the 12 feet requirement for a Type B-W gas vent addresses both building codes and safety standards pertaining to wall furnaces specifically. This ensures that the venting system functions effectively while maintaining compliance with regulations that protect against the dangers of carbon monoxide and other harmful gases.