VIVOSUN Inline Duct Fan 150 mm Quiet Extractor Fan 693 m³/h with EC Motor and GrowHub E42A WLAN Controller AeroZesh T6 Fan for Grow Tents and HydroponicsUnify Your Equipment: You can operate them individually or unify all your smart devices through the GrowHub E42A platform to simplify the complexities of gardening to a scientifically manageable level and thus better stabilize your growth environment Energy Saving & Low Noise Fan: This Fan is controlled by PWM more energy efficient; The mixed flow design allows the fans deliver air across longer distances; The fan ventilates quietly at just 32 dB