Cross flow fans create a wide flow of air using a long cylindrical-shaped impeller. Air is drawn in along the sides of the runner, flows along the circumference of the runner, and is blown out laterally, creating a uniform flow of air. Cross flow fans are used for cooling circuit boards installed in equipment, air curtains, and other applications. In addition, cross flow fans offer the advantages of right-angle air flow and rectangular shape which facilitates installation in corners and saves space.