The Star Tech 92cm x 92cm x 25cm (3 58" x 3 58" x 1") Dual Ball Bearing PC case fan is an add-in cooling fan designed to fit most computers It can be used to circulate cool air into the case or exhaust warm air out preventing problems due to overheating components A quiet running brushless ball bearing DC motor coupled with a high efficiency blade design is capable of moving 37 CFM (cubic feet per minute) of air Power is supplied to the fan using a standard LP4 (hard drive power connector) pass through plug