The StarTech.com 8cm x 8cm x 2.5cm (3 1/8 inch x 3 1/8 inch x 1 inch) fan is designed as a replacement for PC power supply units. A quiet running brushless ball bearing DC motor coupled with a high efficiency blade design is capable of moving 32 CFM (cubic feet per minute) of air. Power is supplied to the fan from a connection point within the power supply. This model features bare tinned leads for power supplies without an internal connector where the replacement fan will be either soldered or spliced to the power leads.