Usage Tips:[Flexible Control Speed] Powerful fan with built-in speed controller. You can choose any speed from 0-with the provided variable speed controller without producing any background noise or low-speed hum. [Settings]Tube Diameter: 100 mm, Air flow: 350 m3/h, Power: 40 W, Noise level: 32 dBA, Pressure: 298 Pa [Quiet and energy] Energy saving is very good: motors EC with mixed flow and PWM control can use precise electronic pulses. This allows the built-in fan to run quieter and reach low speeds without producing noise or heat. The energy efficiency of EC motors is also twice as high and can save up to 40% of energy costs and recover costs in the long run. [Wide Application] This tubular fan in-line is used in indoor installations and vertical farming, heat and cooling transfer, commercial drying and air filtration. Our inline fan can also create a pressurized environment, simulate wind, odor and smoke, and draw in fresh air from outside [Easy Installation]This fan of 100 mm is made of black ABS plastic. It can be easily mounted to the ceiling of your grow tent with ratchet hooks or cable ties.