This item is with quiet copper motor, with anti-backflow vent, which is windproof. Suitable for small office, living room, toilet, kitchen. You can choose with power cable or not. Only when you choose with power cable, it has the function of ON/ OFF and speed control function. If you choose without power cable no additional function. Note: the following size is measured by hand, will have a little error, maybe 5mm error, don't open dispute because of this.
220V 110V 4 Inch Metal Duct Exhaust Fan Mini Bathroom Toilet Air Ventilation Wall Fan
