This 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 the pc case fan 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 3935 cfm cubic feet per minute of air power is supplied to the fan using a standard lp4 hard drive