These high performance inline blowers feature superior steel construction with powder coated baked paint and convenient North-American sizes from 4 to 12 inches. Speed controllable and balanced motors with permanently lubricated ball bearings ensure vibration-free operation. Vortex fans feature permanently lubricated ball bearings, attached pre-wired power cord and 10-year warranty on all fans except CFN-V12XL 2050 CFM inline fan which is a 3-year warranty. Vortex fans are available in High Power high CFM and Low Power reduced CFM models.