The requirements of Section 9-12-1 shall not apply to:
A. Any dwelling unit or accessory building in the R-1 district or R-2 district.
B. Any building of less than twenty-five thousand (25,000) square feet in gross floor area.
C. Any building constructed of wood frame; provided that such building does not contain any metal construction or any below grade levels or below grade parking areas.
D. Any new or existing building that does not have adequate radio coverage as defined in Section 9-12-1.A; when it is determined by the Fire Chief or the Fire Chief’s designated representative that an upgrade or improvement of the radio coverage system is not needed.