Vortex Inline Duct Blower Fans are made from quality heavy duty steel. VTX Models feature a hammertone powder coat finish for added durability. 6″, 8″ and 12″ VTX Models come in two CFM capacities. “Plus” models offer higher CFM output. The fans are built with an extended collar and lip to allow easy duct hookup. Fans feature a permanently lubricated, maintenance-free ball bearing motor for quiet, vibration-free operation. Galvanized mounting brackets allow for horizontal or vertical installation. V-Series High Performance Models 246363 through 246365 feature operating speeds ranging from 1500 to 1700 RPM, providing even quieter operation. Available in duct sizes from 4″ to 16″. CFM ratings range from 175 to 4515. 6’L power cord included. Fans are ETL, CSA and UL507 listed. 10 Year Limited Warranty on VTX Models. 3 Year Limited Warranty on V-Series Models.