VIVOHOME 4 Inch 188 CFM Black Round Inline Duct Fan with Flexible Dryer Vent Hose - Powerful Ventilation for Home, Grow Tents, Greenhouses & Hydroponics

EFFICIENT FAN - Combines the features and benefits of axial and centrifugal fan, effectively circulates air for room ventilation and odor purification; Please be aware that the value of air flow is the maximum tested at ZERO atmospheric pressure

EASY ASSEMBLY - Features with lightweight, durable and UV resistant plastic housing guarantees long-term use; Simply remove the duct ends with locking tabs for quick installation and easy maintanance; Universal mounting bracket for direction of airflow indicating

SPEED CONTROLLABLE - A variable speed controller designed in the 5.4 feet power cord, its three speed switch enables fan to run at low, medium and high speed, you can adjust it to desired airflow level according to your requirement

DUCT PARAMETERS - 4 inches in diameter, 25 feet long when fully extended and can be minimally folded to 13.5 inches; Thermal endurance ranges from -22 to 266 Fahrenheit (-30 to 107 Celsius)

WIDE APPLICATIONS - Commercial and residential air duct solution. Widely used in HVAC applications, bathroom venting, stove hood exhaust, dryer venting, kitchen cooking exhaust, grow room or greenhouse air circulation, etc