| In C-GWUF, the original defog blower fan could also be used to circulate heated air through the defroster vents. |
| Installation of the defog fan is a certification requirement for this aircraft and, accordingly, it is an essential load. |
| To counter this problem, a defog vent blower fan is installed in the cockpit and, coupled with the aircraft heater, provides a recirculating airflow to reduce the fogging of the windshield and side windows. |
| To help defog the windows, operate the air conditioner to dehumidify the air. |
| Suited in gear similar to that of an egressing pilot, test parachutist candidate Mark Cusimano attempts to defog his protective goggles before his jump. |
| Based on this standard, the power supply to the defog fan is automatically an essential load. |
