iPower 4 Inch 214 CFM Inline Duct Fan with 10-Speed Controller & Quiet EC Motor, Ventilation Exhaust Fan for Heating Cooling Booster, Hydroponics, Growing Tents, Black

Efficient Performance: The 4-inch quiet ducted fan uses a pwm controlled EC motor that runs 29 dB and provides 214 CFM airflow for enhanced circulation of fresh air,Speed Control Stability: The 4-inch ventilation fan is equipped with a wired 10-speed fan controller that provides flexible airflow control via a compatible intelligent programming application controller or remote control via a smartphone app,Product Description: Size-4 inch; Speed-3000RPM; Airflow-214 CFM; Engine-EC-Motor PWM; Noise-29 dB; Power-30W; Voltage-110V; Frequency-60HZ; Power Cord Length-4.3FT; Controller Cord Length-7.5FT,Small Footprint and Portability: The 4-inch in-line fan is designed to be compact and lightweight, taking up minimal space, and is suitable for applications where large fans are not suitable.,Multi-Scene Application: 4 inch pipe fan can be used in growing tents, growing houses, greenhouses, hydroponics, basement, kitchen, bathroom, and other places, can clean and fresh air, improve airflow, block odors, control temperature and humidity