Can-Fan brings its innovation to market and sets a new standard for performance. The Max-Fan is more powerful and efficient fan that takes less energy to run. 6" - 14" come pre-wired with an 8’ - 120 volt power cord. 16"-20" come with an 8' whip (240 Volt). 5 year warranty. The Can Fan Max Fan 12" inline duct fan saves energy through energy efficient design, which lowers lifetime cost of energy by 70 to 90%. The Max Fan 12 inch is quiet and highly aerodynamic.