Flex-a-lite 1300 Series Belt-Driven Flex Fan Features: Maximum Airflow At Low RPM Reduced Eng. Load At High RPM Less Resistance At Hwy Speeds More Horsepower Better Gas Mileage 2.25 in. Projected Width 10000 RPM Rating Standard Mounting Pattern Height: 18.00 Width: 2.50 Length: 19.50 Weight: 4.00 lbs Electrical Outlet Plug Type: Fan Blade