Nozzle for a fan assembly

1. A nozzle for a fan assembly, the nozzle comprising:

an air inlet;

a first air outlet for emitting an air flow and a second air outlet for emitting an air flow, the first and second air outlets together defining an aggregate air outlet of the nozzle; and

a valve for controlling an air flow from the air inlet to the first and second air outlets,

wherein the valve comprises one or more valve members that are moveable to adjust the size of the first air outlet relative to the size of the second air outlet while keeping the size of the aggregate air outlet of the nozzle constant, and

wherein the first and second air outlets define a pair of slots provided on an elliptical face of the nozzle and are diametrically opposed to one another.

2. The nozzle of claim 1 , wherein the one or more valve members are moveable through a range of positions between a first end position in which the first air outlet is maximally occluded and a second end position in which the second air outlet is maximally occluded.

3. The nozzle of claim 1 , wherein the first air outlet and the second air outlet are oriented towards a central axis of the face of the nozzle.

4. The nozzle of claim 1 , wherein the nozzle comprises an external guide surface adjacent the air outlets and that spans an area between the first and second air outlets.

5. The nozzle of claim 4 , wherein the first and second air outlets are oriented to direct an air flow over at least a portion of the external guide surface.

6. The nozzle of claim 4 , wherein the external guide surface defines a portion of the first and second air outlets.

7. The nozzle of claim 6 , wherein the first outlet is defined by a first portion of a body of the nozzle and a first portion of the external guide surface and the second outlet is defined by a second portion of the body of the nozzle and a second portion of the external guide surface.

8. The nozzle of claim 4 , wherein the one or more valve members are pivotally mounted.

9. The nozzle of claim 8 , wherein the one or more valve members are pivotally mounted beneath, or adjacent to, the external guide surface.

10. The nozzle of claim 8 , wherein the valve comprises a single valve member that is arranged to pivot relative to a body of the nozzle.

11. The nozzle of claim 1 , wherein the valve comprises a first valve member and a second valve member that cooperate to adjust the size of the first air outlet relative to the size of the second air outlet while keeping the size of the aggregate air outlet of the nozzle constant.

12. The nozzle of claim 11 , wherein the first valve member and the second valve member are linked so that they move simultaneously.

13. The nozzle of claim 11 , wherein the first valve member comprises a first valve arm that is arranged to maximally occlude the first air outlet when the first valve member is in the first end position and the second valve member comprise a second valve arm that is arranged to maximally occlude the second air outlet when the valve member is in the second end position.

14. The nozzle of claim 1 , wherein the one or more valve members are arranged to move translationally.

15. The nozzle of claim 1 , wherein the valve comprises a single valve member that is arranged to be moveable between a first end position in which a first end of the valve member maximally occludes the first air outlet and a second end position in which a second end of the valve member maximally occludes the second air outlet.

16. The nozzle of claim 10 , wherein the first and second air outlets define a pair of elongate slots.

17. The nozzle of claim 15 , wherein the first and second air outlets define a pair of arcuate slots.

18. A fan assembly comprising an impeller, a motor for rotating the impeller to generate an air flow, and the nozzle of claim 1 for receiving the air flow.