Godrej Air Exhaust Fans circulate fresh air to ensure better ventilation. The dynamically balanced blades on the bearings ensure prolonged life, while the polyurethane coating resists corrosion. A braced and varnished vacuum impregnated stator winding is used to make them non-hygroscopic. The air in the vault room needs to be changed as frequently as possible with 6-8 air changes being recommended per hour.