Star Tech 3 5/8" x 3 5/8" x 1" 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 of air. Power is supplied to the fan using a standard LP4 pass through plug.