What is the minimum vertical distance required for a combustion air intake located on the exterior above ground level?

The correct minimum vertical distance required for a combustion air intake located on the exterior above ground level is 12 inches. This requirement is established to ensure that the intake is appropriately positioned to prevent contamination and ensure proper air flow for combustion processes.

By maintaining this distance, it reduces the risk of intake obstructions such as snow, debris, or other materials that could negatively affect the efficiency of combustion. Proper air intake height is critical for the safe operation of heating appliances, as inadequate air supply can lead to incomplete combustion, resulting in dangerous conditions including the buildup of carbon monoxide.

The significance of an air intake’s vertical placement becomes even more pronounced in specific environments, such as those subject to high winds or precipitation. Compliance with the 12-inch requirement helps facilitate proper functioning and adherence to safety regulations governing gas appliances and installations, contributing to increased overall safety and efficiency in heating systems.