The Vortex PowerFan High Performance Duct Blowers are, by far, the best inline duct blowers on the market today. They come in 5 different sizes. The highest power motors combined with its aerodynamically designed shape make Vortex Powerfan the performance leader in its category. These high performance inline blowers feature superior steel construction with powder coated baked paint and convenient sizes from 4 to 12 inches. They have a convenient "tape flange" that allows you to place the ducting on the blower and tape it in place easily! Balanced motors with permanently lubricated ball bearings ensure vibration-free operation. Proudly made in Canada by Atmosphere, the Vortex Powerfan is also the first industrial inline duct fan that comes with a power cord, ready to plug in, installed by the manufacturer. Never seen in the ventilation industry, these blowers feature a 10 year warranty.