Why is it important for exhaust ducts to terminate at a specific height above the roof?

The importance of exhaust ducts terminating at a specific height above the roof primarily relates to the need to avoid contamination from nearby openings. When exhaust gases are released from a duct, particularly in a commercial or industrial setting, they can contain pollutants that, if not properly dispersed, may drift back toward air intake areas such as windows, doors, or other ventilation systems. By ensuring that exhaust ducts extend high enough above the roofline, it minimizes the possibility of these contaminants re-entering the building or affecting neighboring structures.

This strategic height not only promotes better air quality for occupants but also helps in maintaining compliance with environmental regulations that aim to minimize pollution. The height of the exhaust discharge plays a critical role in achieving proper dispersion of exhaust gases, ensuring that they are released into the environment at a safe elevation that reduces potential health risks and environmental impact.