... and durable 3: 100% copper moter works longer 4: CE, wall mounted ventilating fan (exhaust fan)size: 6", 8" ,10", 12"material ... mesh for choicefunction: one way (air out ), two way ( with a switch to choice air out or air in ).Very suitable for Middle ... semi-plastic ventilating fan 6,8,10,12 inch suqare wall mounted type