Small Exhaust FanSuitable for indoor small space ventilation, air exchange. fan for grow tents, Cabinet, small camper, exhaust window, ac vent booster, to move warm air, refrigerator, projector, breaker box, amplifier, receiver or any other application On / Off SwitchFans are particularly useful in situations where they are placed high or in inconvenient locations, eliminating the hassle of constantly plugging and unplugging the unit. An on/off switch for the fan provides additional convenience and ease of use Energy savingEC fan motors achieve as much as 30% more energy efficiency than AC fan motors. small electric fan space saving, strong plastic material, light weight and easy to install 4Inch Fan120 x 120 x 38 mm ( 4.72 x 4.72 x 1.5 in. ) Rated Voltage:90V to 270V Airflow: 116 ±10%CFM Power: 6.0W Speed: 2800 RPM Noise: 41 dBA Air Pressure (In H2O): 0.39 Dual Ball BearingLong-term work. Long life-50,000 Hours. computer fan with 4.9 feet AC plug.