The provisions of this chapter shall apply to air conditioning and air handling systems in Single Residential Districts, but shall further apply to air conditioning and air handling systems which are in operation or which shall be in operation in a Mixed Multiple Resident District, Multiple Residence District, Local Retail Business District, General Retail Business District, House Trailer District, Limited Industry District, Mixed Use District, Class A Hi Rise Residential District, and Class B Hi Rise Business Office and Professional District, which border upon and are contiguous to a Single Residential District. (Ord. 72-77. Passed 6-20-72.)