【Smart programming app】Smart APP controller with temperature and humidity programming, fan speed control, timer and alarm system. The controller has precise temperature and humidity sensors on a 2.5m wired probe. 【Parameters】Tube diameter: 100mm, Airflow: 350m³/h, Power: 40W, Noise level: 28dBA, Pressure: 298Pa, IP44 rating 【Quiet and Energy】Energy saving is very good: EC motors with mixed flow rate and PWM control can use precise electronic pulses. This allows the built-in fan to run quieter and achieve low speeds without producing noise or heat. The energy efficiency of EC motors is also twice as high and can save up to 40% in energy costs and recover long-term costs. 【Wide Application】This inline duct fan is used in indoor installations and vertical farming, heat transfer and cooling, commercial drying and air filtration. Our in-line fan can also create a pressurized environment, simulate wind, odors and smoke and suck fresh air from outside 【GUARANTEE】100% refund or free replacement if there is any quality problem during the warranty period. Please feel free to contact us for any technology issues or other comments. We respond within 24 hours.