US Patent 7423872 Air shroud installed on a circuit board

A air shroud installed on a circuit board is composed of a circuit board which is installed with an outer housing, an inner surface of which is connected with at least more than one fan, and a side of which is provided with an air exit. The fan is provided with an air entrance and an air exit, wherein the air exit is corresponding to the air exit of outer housing. Air sucked in by the air entrance of fan is expelled out of the air exit of outer housing to be exported, through the air exit of fan, such that the air can be led to another space area or be used to dissipate heat from a specific electronic component.