Air conditioning systems may be installed in school vehicles if: The systems are approved by the Administration; The agency and personnel installing the systems have been certified by the air conditioning manufacturer; There are no sharp edges or protrusions that could injure students; The total vehicle battery capacity is of sufficient amperes to supply all electrical requirements; The vehicle alternator rating is at least 130 amperes; and The system does not contain refrigerant that is toxic to individuals or is flammable. System operating controls, including the on-off and blower switch or switches and the thermostat control or controls, shall be accessible to the driver in a seated position. Wiring, hoses, and lines shall be grommeted, routed, and supported so as to reduce wear resulting from heat, chafing, vibration, or other factors. Evaporator cases, lines and ducting shall be designed so that condensation is effectively drained to the exterior of the vehicle below floor level and under all conditions of vehicle movement without leakage on any interior portion of the vehicle. Evaporator cases, lines, and ducting shall be inaccessible to passengers. System components shall be readily available for servicing. An air conditioning grill on the exterior shall be the same color as the predominant area in which it is installed.