KKK-B-1579B
of first passenger seat to a point within 18 inches of the face of the rear seat. Grab rail or
stanchion at the front of the service door and the ceiling grab rails shall be at least 1-inch
diameter stainless steel, stainless steel clad, or plastic-coated steel tubing.
3.5.10 Heating, defrosting, and ventilating. Heating, defrosting, and ventilating systems
shall conform to Federal Motor Carrier Safety Regulations 393.77 and 393.79.
3.5.10.1 Heater. A hot water heating system having a total capacity of not less than the
number of Btu per hour specified in table IV at 150°F water to ambient air temperature
differential, shall be installed. Adjustable manual controls shall be provided to permit outside
air, recirculated air, or variable mixtures as desired, to circulate through at least the main heater
core. Heater(s) shall be located to assure flow of heater air to driver's area, to all parts of the
passenger compartment and located in protected positions. When specified (see 6.2), there shall
be not less than four heaters: two front, one middle, and one to the rear. A 12-volt coolant
booster pump shall be furnished when a diesel engine is required.
Table IV. Heater requirements, system
Type
Number of Btu
I
70,000
II, VI, and VII
110,000
III and V
120,000
IV
130,000
3.5.10.2 Defroster. Defroster outlets with suitable connections and independent
blower(s) shall be furnished. The windshield defrosting systems shall conform to SAE 381 and
SAE 382. When specified (see 6.2), a right hand heater, blower, and defroster shall be provided
for severe weather conditions.
3.5.10.3 Ventilator. Ventilator(s), of the static type, capable of providing an adequate
supply of fresh air and of properly ejecting foul air under all conditions of operation shall be
provided in the roof. Vent openings shall be provided with a weather-proof cover with means
for opening and closing the cover from inside the vehicle. Outside openings for heaters and
ventilators shall be so located as to minimize entry of fumes, rain, road dust, and road wash.
3.5.11 Body equipment. Body equipment shall be complete with all accessories listed by
the manufacturer as standard equipment and, in addition, shall include items specified in 3.5.11.1
through 3.5.11.9 herein.
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