[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 Efficient] Energy-saving design: EC motors with mixed flow and PWM control use precise electronic pulses. This allows the built-in fan to operate quietly and reach low speeds without noise or excess heat. EC motor efficiency is significantly higher, helping reduce energy consumption. [Wide Application] This inline tubular fan is suitable for indoor ventilation, vertical farming, heat and cooling transfer, commercial drying, and air filtration systems. It can help create a pressurized environment, manage odors, and bring in fresh air from outside. [Easy Installation] This 100 mm fan is made of black ABS plastic and can be easily mounted to the ceiling of a grow tent using ratchet hooks or cable ties.