Patent ID: 7443671

Claim:
A cooling fan comprising: a housing that connects to a chassis that is operable to support an electronic component; an axial duct through said housing; a blade assembly rotatably disposed within said duct, wherein said blade assembly comprises a plurality of fan blades that extend radially from a hub to a fan diameter, wherein said axial duct has a chord length at least equal to the fan diameter; and a motor assembly disposed within said axial duct and coupled to said blade assembly, wherein said motor assembly comprises: a windings section coupled to said housing; an axle coupled to said blade assembly and disposed partially within a bore through said windings section; and a bearing assembly that rotatably couples said axle to said windings section, wherein said bearing assembly is disposed outboard of said windings section; wherein the cooling fan provides a cooling capacity of at least 1.5 air horsepower per cubic inch volume of the cooling fan.