24:06:07:04.  Heating and air conditioning systems. Heaters must be provided in a school bus, air conditioning systems may be installed in accordance with the section entitled "Heating and Air Conditioning Systems" on pages 44 to 48, inclusive, of the National School Transportation Specifications & Procedures, May 2015 Revised Edition. In addition, the following standards apply to school buses as defined in "School Bus Types" on pages 332 to 333 of the National School Transportation  Specifications & Procedures, May 2015 Revised Edition:

 

          (1)  The minimum installation for a Type A bus is one front fresh air heater, utilizing the manufacturer's standard heater with a defroster core and a driver's deflector, and one or more rear recirculating underseat heaters with a minimum of 38,000 BTUs;

 

          (2)  The minimum installation for Type B and C buses is one left front fresh air heater with a defroster core and a driver's deflector with a minimum of 80,000 BTUs, one right cowl recirculating heater with a minimum of 50,000 BTUs. The minimum installation for a type D bus is one front fresh air heater with a defroster core and minimum of 80,000 BTUs, plus a drivers underseat heater with a minimum of 14,000 BTUs, and rear heaters for type B, C, and D buses are as follows:

 

               (a)  Buses with a capacity of less than 59 passengers must have a rear underseat recirculating heater with a minimum of 75,000 BTUs;

 

               (b)  Buses with a capacity of 59 passengers or more must have two rear underseat recirculating heaters or a combination of one midship and one rear, each having a minimum of 75,000 BTUs.

 

          Source: 22 SDR 61, effective November 9, 1995; 30 SDR 181, effective May 20, 2004; 33 SDR 152, effective April 5, 2007; 38 SDR 58, effective October 17, 2011; 44 SDR 43, effective September 13, 2017.

          General Authority: SDCL 13-29-2, 13-29-6.

          Law Implemented: SDCL 13-29-2, 13-29-6.

 

          Reference: "School Bus Types," on pages 332 to 333, and "Heating and Air Conditioning Systems," pages 44 to 48, National School Transportation Specifications & Procedures, 2015 Revised Edition. Copies may be obtained from www.ncstonline.org. Cost: $55.