High Airflow Efficiency:Achieve rapid air circulation with a 210 CFM airflow, ensuring optimal ventilation for your mushroom grow tent. Variable Speed Control:Enjoy customizable ventilation with the EC motor fan's variable speed controller, tailoring noise and energy use. Compact and Design:The 4 inch exhaust fan's small, build makes it easy to install and maintain in tight spaces. and Quiet Operation:Equipped with dual ball bearings, this 4 inch ventilation fan operates quietly at 32dBA, ensuring and reliability. High effective: transfer air to your target location in a quick and reasonably quiet way, with a fan speed of 2800 RPM for an air flow of 210 CFM.<br><br>EC motor with variable speed control provides quiet and energy-efficient performance with minimal heat and noise. Small design: , compact fan takes up minimal space. Easy to Install: removable duct ends with locking tabs for easy removal and maintenance. Duct Size: 4 inch Airflow: 210 CFM Noise Level: 32 Bearings: Dual Ball Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Voltage: AC220V Color: Black Material: plastic<br><br>Package Contents: 1 x Inline Duct Ventilation Fan<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.