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Where investigation discloses that unusual or extraordi- nary hazards require more stringent means of protection, the director shall have the authority to require the installation of the same. The director shall in all cases specify the facts constituting the greater hazard found to require more stringent protective measures. The more stringent protective measures shall be related to such unusual or extraordinary hazards and shall be no more burdensome than is reasonably necessary %o al- leviate or guard against such hazards'. The director shall specify in writing to the owner the manner in which the more stringent protective measures alleviate or guard against the unusual or ex- -~-~traordinary hazards. Section 38-67.5. Connections to boilers. Potable water connections to boilers shall be made through an air gap or provided with an approved backflow preventer. Section 38-67.6. Connections to refrigerating units, etc. Potable water inlet connections to refrigerating unit con- densers, cooling jacke~s and air conditioning cooling systems will be air gapped or provided with an approved backflow pre- ~ente~. Section 38-67.7. Fire service systems. ('a) Fire service systems having direct connections from · waterworks with no pumps or storage facilities, no connections to other water supplier, no antifreeze or other chemicals added to the fire system, and all sprinkler heads discharging to the atmosphere are not required to have positive pro~ective devices. (b) In systems such as these listed in subsection (a) of this 'section which have booster pumps installed in the connection from.the waterworks provision shall be made to avoid lowering the pressure at the connection to the waterworks below ten psi. lc) Systems with direct connections to the waterworks, which -are comparable to the systems described under subsections (a) and (b) of this section and which have an auxiliary supply wikhin one thousand ~eve~ hundred feet of the pumper connection, must pro- vide a~ a~r'gap, a reduced pressure principle backflow preventer or a double gate-double check valve assembly, depending on the ~uality of ~he auxiliary supply.