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Blower designs for vented enclosures include an impeller having a plurality of blades. The impeller includes a plurality of blades pivotably coupled to an impeller body. The blades pivot to enable operation in one of a closed and an open state. Air flow between blades is substantially restricted whe

Blower designs for vented enclosures include an impeller having a plurality of blades. The impeller includes a plurality of blades pivotably coupled to an impeller body. The blades pivot to enable operation in one of a closed and an open state. Air flow between blades is substantially restricted when the blades are in the closed state. Air flow between the blades is permitted when the blades are in an open state. In one embodiment, the pivotable couplings are spring loaded to maintain the blades in the closed state when the impeller rotational speed is below a threshold range. The blades pivot to the open state when the rotational speed exceeds the threshold range.

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1. An apparatus comprising: an enclosure having at least one vent; and a plurality of blowers for exchanging air between the interior and the exterior of the enclosure in co-operation with the vent, wherein each blower comprises an impeller having pivotable blades permitting substantially no rev

1. An apparatus comprising: an enclosure having at least one vent; and a plurality of blowers for exchanging air between the interior and the exterior of the enclosure in co-operation with the vent, wherein each blower comprises an impeller having pivotable blades permitting substantially no reverse air flow through the blower when the rotational speed of the impeller falls below a threshold range. 2. The impeller of claim 1 wherein each pivotable blade is coupled to an impeller body by a spring loaded pivotable coupling to maintain the blades in a closed state when the impeller rotational speed is below the threshold range, wherein the blades pivot to an open state to permit air flow between the blades when the impeller speed exceeds the threshold range. 3. The impeller of claim 1 wherein each blade partially overlaps an adjacent blade in the closed state. 4. The impeller of claim 1 wherein no blade partially overlaps an adjacent blade in the closed state. 5. The apparatus of claim 1 wherein the blades of at least one impeller are configured for centrifugal pumping action. 6. The impeller of claim 1 wherein the blades form a selected one of an airfoil, backward inclined, backward curved, radial, paddle, and forward curved configuration. 7. An apparatus comprising: an enclosure having a plurality of interfaces for exchanging air between the interior and exterior of the enclosure; and a plurality of blowers each residing at an associated one of the plurality of interfaces, wherein each blower comprises an impeller having pivotable blades permitting substantially no reverse air flow through its associated interface when a rotational speed of the impeller falls below a threshold range. 8. The impeller of claim 7 wherein each pivotable blade is coupled to an impeller body by a spring loaded pivotable coupling to maintain the blades in a closed state when the impeller rotational speed is below the threshold range, wherein the blades pivot to an open state to permit air flow between the blades when the impeller speed exceeds the threshold range. 9. The impeller of claim 7 wherein each blade partially overlaps an adjacent blade in the closed state. 10. The impeller of claim 7 wherein no blade partially overlaps an adjacent blade in the closed state. 11. The apparatus of claim 7 wherein the blades of at least one impeller are configured for centrifugal pumping action. 12. The impeller of claim 7 wherein the blades form a selected one of an airfoil, backward inclined, backward curved, radial, paddle, and forward curved configuration. 13. An apparatus comprising: an enclosure having at least one vent and a plurality of interfaces for exchanging air between the interior and exterior of the enclosure; and a plurality of blowers each residing at an associated one of the plurality of interfaces, wherein each blower comprises an impeller having pivotable blades permitting substantially no reverse air flow through its associated interface when a rotational speed of the impeller falls below a threshold range. 14. The impeller of claim 13 wherein each pivotable blade is coupled to an impeller body by a spring loaded pivotable coupling to maintain the blades in a closed state when the impeller rotational speed is below the threshold range, wherein the blades pivot to an open state to permit air flow between the blades when the impeller speed exceeds the threshold range. 15. The impeller of claim 13 wherein each blade partially overlaps an adjacent blade in the closed state. 16. The impeller of claim 13 wherein no blade partially overlaps an adjacent blade in the closed state. 17. The apparatus of claim 13 wherein the blades of at least one impeller are configured for centrifugal pumping action. 18. The impeller of claim 13 wherein the blades form a selected one of an airfoil, backward inclined, backward curved, radial, paddle, and forward curved configuration.