Abstract: An impeller for a centrifugal fan includes a hub, impeller blades, and struts for supporting the blades in a circumferential array spaced apart from the hub. The number of struts can equal the number of blades, each strut extended from the hub to support two blades while each blade is supported by one strut nearer to its leading edge and another strut nearer to its trailing edge. Another arrangement features two struts per blade, with one of the struts coupled to the hub and a given blade, and the other strut coupled between the given blade and an adjacent blade. The struts are recessed inwardly from the leading and trailing edges to promote smoother air flow. The blades and struts are provided with aerodynamic thickness profiles to further improve air flow.

Abstract: An impeller for a centrifugal fan includes a hub, impeller blades, and struts for supporting the blades in a circumferential array spaced apart from the hub. The number of struts can equal the number of blades, each strut extended from the hub to support two blades while each blade is supported by one strut nearer to its leading edge and another strut nearer to its trailing edge. Another arrangement features two struts per blade, with one of the struts coupled to the hub and a given blade, and the other strut coupled between the given blade and an adjacent blade. The struts are recessed inwardly from the leading and trailing edges to promote smoother air flow. The blades and struts are provided with aerodynamic thickness profiles to further improve air flow.

Abstract: An assembly includes a fan housing that includes a casing and a stator disposed radially inward of the casing and adapted to receive a rotor assembly. Struts attach the stator to the casing. One or more of the struts may define a channel for routing one or more electrical wires. A fan guard helps prevent accidental contacting of the fan blades. The fan guard may be mounted to the struts and may be flush with the housing, and/or may be adapted to cover at least a portion of the channel, thereby trapping the electrical wire(s) in the channel.

Abstract: An assembly includes a fan housing that includes a casing and a stator disposed radially inward of the casing and adapted to receive a rotor assembly. Struts attach the stator to the casing. One or more of the struts may define a channel for routing one or more electrical wires. A fan guard helps prevent accidental contacting of the fan blades. The fan guard may be mounted to the struts and may be flush with the housing, and/or may be adapted to cover at least a portion of the channel, thereby trapping the electrical wire(s) in the channel.