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A duct flow-type fan comprised of a housing having at least one upper and one lower side walls as well as a laterally oriented air port, a motor, a vane, and a shaft. The vane is fitted onto one end of the shaft, with the other end of the shaft conjoined to and driven by the motor such that vane air

A duct flow-type fan comprised of a housing having at least one upper and one lower side walls as well as a laterally oriented air port, a motor, a vane, and a shaft. The vane is fitted onto one end of the shaft, with the other end of the shaft conjoined to and driven by the motor such that vane air current passes through the laterally oriented air port of the housing to cool the heat sink of a computer chip in order to achieve efficient computer chip heat dissipation.

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1. A duct flow-type fan comprising: a housing comprising an open front side, a rear side, an upper side wall and a lower side wall positioned between the front and rear sides; a first air port positioned on a first lateral side of the housing between the upper and lower side walls; a propeller-

1. A duct flow-type fan comprising: a housing comprising an open front side, a rear side, an upper side wall and a lower side wall positioned between the front and rear sides; a first air port positioned on a first lateral side of the housing between the upper and lower side walls; a propeller-shaped vane positioned at the open front side; a shaft secured to the vane, the shaft extending towards the rear side; a motor connected to and adapted to rotate the shaft; and wherein when the motor is activated, air flows between the open front side and the first air port in a substantially perpendicular direction. 2. The duct flow-type fan of claim 1, wherein the shaft has at least one auxiliary vane installed thereon. 3. The duct flow-type fan of claim 1, wherein the housing further comprises a second air port positioned on a second lateral side of the housing between the upper and lower side walls of the housing. 4. The duct flow-type fan of claim 3, wherein the shaft has at least one auxiliary vane installed thereon. 5. The duct flow-type fan of claims 1 or 2, wherein the housing further comprises at least one guide plate positioned at the first lateral side of the housing and adapted to guide air flow. 6. The duct flow-type fan of claims 3 or 4, wherein the housing further comprising at least two guide plates, respectively positioned at the first and second lateral sides of the housing and adapted to guide air flow. 7. A duct flow-type fan comprising: a rectangular housing comprising an open front side, an open rear side, an upper side wall and a lower side wall positioned between the open front and open rear sides; a first air port positioned on a first lateral side of the housing between the upper and lower side walls; first and second propeller shaped vanes respectively positioned at the open front and open rear sides; a motor positioned between the first and second vanes; first and second shafts respectively connecting the first and second vanes to the motor, and the motor adapted to rotate the shafts; and wherein when the motor is activated, air flows between the open front and rear sides and the first air port in substantially perpendicular directions. 8. The duct flow-type fan of claim 7, wherein the shaft has at least one auxiliary vane installed thereon. 9. The duct flow-type fan of claim 7, wherein the housing further comprises a second air port positioned on a second lateral side of the housing between the upper and lower side walls of the housing. 10. The duct flow-type fan of claim 9, wherein the shaft has at least one auxiliary vane installed thereon. 11. The duct flow-type fan of claims 7 or 8, wherein the housing further comprises at least one guide plate positioned at the first lateral side of the housing and adapted to guide air flow. 12. The duct flow-type fan of claim 9 or 10, wherein the housing at least two guide plates, respectively positioned at the first and second lateral sides of the housing and adapted to guide air flow.