Mechanical draft vents must terminate a minimum of how many feet above a public walkway?

The correct answer is that mechanical draft vents must terminate a minimum of 7 feet above a public walkway. This requirement is in place to ensure the safety of individuals who may be walking beneath the vent, preventing potential exposure to harmful exhaust gases or other emissions that could arise from the venting process. By establishing this minimum height, the design promotes public health and safety by reducing the risk of inhalation of pollutants.

Additionally, the 7-foot clearance aligns with standardized codes and regulations that dictate venting practices in various settings, ensuring consistency and safety in building construction and maintenance. Ensuring proper vent height is crucial for both the efficient operation of mechanical systems and the protection of public spaces.