HVAC Fan Wiring For Standalone Use 120 Volt Outlet Furnace Fan Blower Assemblies Complete Squirrel Cage with 4-Speed motor and 7.5 mFD CAP. Furnace fan blower assemblies squirrel cage with 4-speed ge motor and cap because these units are used in furnaces they can handel the heat. Unit can be hooked to a barn or garage for instant ventalation.