Type B-W gas vent must terminate at least how many feet in vertical height above the bottom of the wall furnace?

The requirement for a Type B-W gas vent to terminate at least 12 feet in vertical height above the bottom of the wall furnace is rooted in safety and regulatory standards. This height is necessary to ensure proper venting of combustion gases, allowing them to disperse safely into the atmosphere. Ensuring this vertical clearance helps to minimize the risk of backdrafting, which can lead to dangerous carbon monoxide accumulation indoors.

Additionally, the required height allows for the natural rise of hot gases, promoting efficient venting and preventing any possible interference from structural elements or environmental factors, such as nearby trees or buildings. By adhering to this standard, compliance with safety codes is maintained, protecting both the occupants of the building and the integrity of the heating system.