The 8'' F5 High output In Line Fan achieves an unheard of level of performance and efficiency using advanced mix-flow technology and a specially engineered aerodynamic design. These fans are powerful. The 8'' F5 High output In Line Fan achieves an unheard of level of performance and efficiency using advanced mix-flow technology and a specially engineered aerodynamic design. These fans have powerful internal drive motors, maintain high CFM ratings, and are aerodynamically designed. They feature UL recognized components, and an attached 8 ft power cord and mounting brackets.