The provisions of this Code shall not apply to any combustion device erected, constructed, altered or installed in any style in any single or two-family house not used for commercial purpose, or retail business; or any single or two-family dwelling that has not more than one retail establishment attached thereto or included therein, said retail establishment being the secondary or incidental function of the building or serving not more than two dwelling units, nor shall the provisions of this Code apply to the erection, construction, alteration, installation or inspection of any warm air furnace, any unit heater, direct fired unit heater or ceiling type unit heater provided, however, that if the operation of such equipment violates Section 1377.01 of this Code, and a complaint is received, the Air Pollution Control Officer shall take the necessary steps to abate the violation. (Ord. 1970-69. Passed 7-28-70.)