This duct fan combo helps to boost airflow in HVAC units to remove exhausts and odors from kitchen or bathroom, also can used as intake fan to bring fresh air into grow rooms.Package include: 1 pack 6 inch booster fan, 1 pack 6 inch 16 feet aluminum ducting (2 clamps included).Ducting Size: 6 inches (diameter) x 16 feet (length) when fully extended, temperature endurance range from 0 ~ 185°F(-18℃ ~ 85℃), free pair of 6 inch metal clamps made from stainless steel.Fan Specification:Diameter: 6 inch;Air Flow: 174 CFM;Speed: 2800 RPM;Voltage: 110-120V;Wattage: 37W.Fan Advantages:1.Engineered for maximum boost with minimum noise;2.Energy efficient & quiet operation;3.Balanced blades are ideal for boosting air supply and venting exhaust air;4.Lightweight & super easy to install;5.Motor features a permanently lubricated bearing that operates quietly and requires no maintenance.Note: if any other materials/particles get into the duct fan and get the blade stuck, users are to turn off the power immediately, clean it up, turn the power back on when handled properly.