Startechcom Heavy Duty Pc Add-In Case Computer Fan/Video Ca Exhaust Fan Inlet Brushless Dc Motor HEAVY DUTY PC CASE COMPUTER FAN/VIDEO CA. Product Type: System fan kit. Product Type: System fan kit. Width: 3.54 Inch. Sound Emission: 32 dB; Product Length: 4.33 in. Height: 0.79 Inch. An add-in cooling fan designed to fit in the PCI or ISA expansion slots of any computer. It is used to exhaust warm air out, preventing problems due to overheating components.