18-28-502.6.3.6 Termination point.
   The termination point for exhaust ducts discharging to the out-of-doors shall be located with the following minimum distances.
   1.   For ducts conveying explosive or flammable vapors, fumes or dusts: 30 feet (9144 mm) from the property line; 10 feet (3048 mm) from openings into the building; 6 feet (18829 mm) from exterior walls and roofs; 30 feet (9144 mm) from combustible walls and openings into the building which are in the direction of the exhaust discharge; 10 feet (3048 mm) above adjoining grade.
   2.   For environmental air duct exhaust: 3 feet (914 mm) from the property line; 3 feet (914 mm) from openings into the building.
   3.   For environmental air duct exhaust 3 feet (914 mm) from the property line; 3 feet (914 mm) from openings into the building.