an A or R Zone shall be done within a completely enclosed building or room. The doors of such building or room may be open during the following hours: (i) From 7 a.m. until 8 p.m. on Mondays through Fridays; (ii) From 9 a.m. until 8 p.m. on Saturdays; and (iii) From 11 a.m. until 8 p.m. on Sundays. At all other times, the doors of such building or room shall be closed, except at intervals necessary for ingress and egress. (2) All body and fender repairing when conducted within 150 feet of an A or R Zone shall be done within a completely enclosed building or room with stationary windows. The doors of such building or room may be opened only at intervals necessary for ingress and egress, except that garage bay doors may be open during the hours of operation set forth in Paragraph (1) of this subdivision, provided: (i) A minimum 10-foot-high solid masonry fence or a minimum 10-foot-high intervening commercial or industrial building enclosed on at least three sides is maintained at the property line adjacent to the A or R Zone, or; (ii) Doors facing a public street shall be closer to the property line adjacent to the public street than the required yard setback of any adjacent A or R Zone. (3) All automotive spray painting shall be done in full compliance with the provisions of Article 7 of Chapter 5 of the Code regulating these installations; provided further, that no spray painting may be done except in an approved spray booth or room approved for this use that is located within a wholly enclosed building. In the M2 or M3 Zone a spray booth approved for use outside of a building may be utilized if allowed by all other jurisdictions having authority over spray painting. (4) Except for allowable outside uses when conducted in the M2 or M3 Zones, all other operations shall be conducted within a building enclosed on at least three sides, except for the following, which may be conducted within the first 18 feet in depth measured perpendicular to the entire length of the building wall containing a garage bay door; said area shall not displace any required parking: (i) electrical diagnostics; (ii) battery charging and changing; (iii) tire removal and replacement, provided the vehicle is not elevated more than 12 inches off the ground measured to the bottom of the tire. A portable hoist only, may be used for this purpose.