To meet installation standards, Type B-W gas vents must be installed at least how far above a wall furnace?

Type B-W gas vents are designed for use with wall furnaces and are a critical component in ensuring safe and efficient venting of combustion gases. To adhere to installation standards, these vents must be positioned a specific distance above the wall furnace to prevent the possibility of combustion gases entering the living space, ensuring that gas combustion is effectively and safely vented outdoors.

The requirement of a minimum of 12 feet above the wall furnace is based on safety considerations, including protecting against backdrafts and ensuring that any exhaust gases dissipate adequately into the atmosphere. This height helps to prevent the re-entrainment of combustion gases into the living area and minimizes the risk of carbon monoxide exposure, which can be hazardous.

Other heights listed, such as 8, 10, and 14 feet, may not comply with the established standards for safety and efficacy in venting, which highlights the importance of following the 12-foot requirement precisely to ensure the proper function and safety of the wall furnace venting system.