Flex-a-lite 16-inch LoBoy auxiliary electric fans can help with an engine that's running hot. By installing a LoBoy on the front of the radiator, it can move additional air through the radiator when needed. The LoBoy uses a large, 16-inch blade and a powerful motor to move 2, 500 cfm of airflow. It is compact, though, with a depth of only 3 3/16 inches, to fit in tight clearances.