How far from operable openings into buildings should ducts conveying explosive or flammable vapors be positioned?

Ducts that convey explosive or flammable vapors must be positioned at least 10 feet from operable openings into buildings to minimize the risk of fire or explosion. This distance is established to provide a safety buffer, ensuring that any potential hazardous emissions do not easily enter the building through windows, doors, or other openings. Maintaining this distance helps to control and mitigate the risk posed by the concentration of flammable vapors, thereby enhancing a facility's safety standards. Moreover, regulations often focus on creating designated safe zones away from potential ignition sources, which underscores the importance of proper duct placement in the design of mechanical systems.