Division 2.2.4 F1

The inner surface of the windscreen shall be cleaned as set out in point 2.2.1 before the vehicle is placed in the environmental chamber. The ambient air temperature shall then be lowered and stabilised at - 3 ± 1 ℃. The vehicle shall be switched off and shall be kept at the test temperature for not less than 10 hours prior to commencement of the test.