[Flexible Control Speed] Powerful fan with built-in speed controller. You can choose any speed from 0-100% 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: motors with mixed flow and PWM control use precise electronic pulses. This allows the built-in fan to run quietly and reach low speeds without producing noise or heat. The energy efficiency is high and can save energy costs over time. [Wide Application] This tubular inline fan is used in indoor installations and vertical farming, heat and cooling transfer, commercial drying, and air filtration. The inline fan can create a pressurized environment, simulate wind, remove odors and smoke, and draw in fresh air from outside. [Easy Installation] This 100 mm fan is made of black ABS plastic. It can be easily mounted to the ceiling of your grow tent with ratchet hooks or cable ties.