What is the minimum height above finished grade for the bottom of a vent termination?

The minimum height above finished grade for the bottom of a vent termination is set at 12 inches to ensure proper function and safety. This height requirement is established to prevent any potential issues that may arise from snow accumulation, water runoff, or other environmental factors that could obstruct the vent pipe. By ensuring that the termination is elevated above this minimum height, it helps to allow for proper venting and reduces the risk of backflow, blockage, or other ventilation issues.

In addition, this 12-inch requirement is consistent with best practices in ventilation system design as outlined in relevant building codes. Proper ventilation is critical for the safe operation of gas appliances and for overall indoor air quality, making it essential to follow these prescribed heights. Adequate clearance from the finished ground level contributes to the longevity and reliability of the venting system.