What is the minimum height requirement for the exit terminal of a mechanical draft system located adjacent to a public walkway?

The minimum height requirement for the exit terminal of a mechanical draft system located adjacent to a public walkway is established to ensure safety and compliance with health regulations. The requirement of 7 feet is designed to prevent accidental contact with individuals using the walkway, thereby minimizing the risk of injury or exposure to potentially harmful exhaust gases.

This height allows enough clearance for pedestrians and also helps to ensure that any products of combustion or exhaust are effectively dispersed, reducing the likelihood of them re-entering buildings or affecting air quality in the vicinity. The regulation aims to balance safety for public access while accommodating the technical needs of mechanical exhaust systems.

Choosing 7 feet reflects a consensus in safety regulations that promotes public health and safety in areas where mechanical draft systems are employed. Other height options may not adequately provide protection for pedestrians or adequately address the dispersion of exhaust products, thus making 7 feet the appropriate and effective standard.