(a)
(1) Defrosting and defogging equipment shall direct a sufficient flow of heated air onto the windshield, the window to the left of the driver, and the glass in the viewing area directly to the right of the driver to eliminate:
- (A) Frost;
- (B) Fog; and
- (C) Snow.
- (2) The defroster unit shall have a separate blower motor in addition to the heater motors or plenum with single blower.
(3) Defrosting and defogging equipment for Type A vehicles shall direct a sufficient flow of heated air onto the windshield to eliminate:
- (A) Frost;
- (B) Fog; and
- (C) Snow.
- (b) The defroster and defogging system shall conform to SAE International Standard J381.
- (c) The defroster and defogging system shall be capable of furnishing heated outside ambient air, except that part of the system furnishing additional air to the windshield, entrance door, and stepwell may be of the recirculating air type.
- (d) Auxiliary fans are not considered defrosting or defogging systems.
- (e) Portable heaters shall not be used.