Ind. Admin. Code tit. 575, r. 1-9-21 – Defroster

Sec. 21. (a) Each bus must have a windshield defroster and defogging system that conforms to applicable SAE standards. The system must keep the windshield, the side window to the left of the driver, and the glass entrance doors clear of fog, frost, and snow. It must be capable of heating outside ambient air. The system may use heat directly from an approved heater or auxiliary heater or heaters.

(b) Auxiliary fans may be used to recirculate the air but are not considered to be part of the defrosting system. Auxiliary fans must:

(1) be placed in an accessible location;
(2) be at least six (6) inches in diameter each;
(3) have a protective cage, which must cover the fan blades; and
(4) be controlled separately from the defroster system.

(State School Bus Committee; 575 IAC 1-9-21; filed Aug 15, 2014, 10:20 a.m.: 20140910-IR-575130244FRA; readopted filed Aug 12, 2020, 10:18 a.m.: 20200909-IR-575200228RFA)