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TOPHORT 4 inch 200 CFM Inline Duct Fan with Speed Controller Ideal for controlling hot and humid conditions in grow tents/rooms. This inline duct fan helps with ventilation issues. It is built durable, runs smooth and quiet. Durable plastic fan housing and blades for extremely low noise; Variable speed controller for easy fan speed adjustment. Features Balanced blades are ideal for boosting air supply and venting exhaust air. Motor features a permanently lubricated bearing that operates quietly and requires no maintenance. Solve air delivery problems without major system rework or expense. Can be installed in any location, such as greenhouses, tents, etc. Energy efficient & quiet operation Lightweight & super easy to install. Perfect for connecting with carbon filter to circulate purified air in grow tent / green house Fluted on both ends to receive ducting Features Diameter: 4 inch Power Supply: 110/120 V Power: 60 W Current: 0.26 A Speed: 2400 RPM Air Flow: 200 CFM Noise Level