VENTAMATIC VX1000SOLAR MIL Solar Attic Ventilator,Galvanized Attic Ventilator, Solar Powered, Roof Mount, Voltage 18 DC, Variable Depending on Sun Exposure RPM, 1000 CFM @ 0030-In SP, Max Attic Area 1550 Sq Ft, Free Air Intake Required 5.0 Sq Ft, Opening Required 14 1/2 dia In, Dome Dia 25 In, Dome Material Mill Finish Galvanized Steel, Includes Detached Solar Panel and 25 Ft Cord Connection