This PC case fan is an economically-priced add-in cooling fan designed to provide efficient cooling for your PC. Able to exhaust warm air out or circulate cool air into the case the FANBOXSL can help to eliminate overheated components and maintain peak performance within your system. Featuring an Ever Lubricate bearing design for longer life beyond similar featured sleeve bearing models this quiet running fan offers up to 24.81 CFM (cubic feet per minute) of air. Power is supplied to the fan using a power tap connected to the large LP4 power connector on your PC\'s power supply.