크기 = 397 x 397 x 26mm 높이 = 397mm 최대 작동 온도 = +70°C 최소 작동 온도 = -30°C Width = 397mm Operating Temperature Range = -30 ??+70 °C Back Draught Shutters. To prevent back draughts Lightweight blades and square opening provide maximum free area when the fan is operating Blades close under gravity when the fan airflow ceases All components are light grey and UV stabilised to provide a long life