Fan

1. A fan assembly comprising:

a body comprising an air inlet, an air outlet, and an air flow generator for generating an air flow through the body, the body comprising a lower body section and an upper body section, the upper body section housing the air flow generator and the lower body section housing a control circuit for controlling the air flow generator; and

a nozzle for receiving the air flow from the body and for emitting the air flow,

wherein the lower body section comprises an outer wall, an inner wall, and an oscillation mechanism for rotating the upper body section relative to the lower body section, the outer wall and inner wall defining an outer cavity surrounding an inner cavity, and wherein the control circuit is located within the inner cavity surrounded by the inner wall.

2. The fan assembly of claim 1 , wherein the outer cavity comprises a floor surface located between the outer wall and the inner wall.

3. The fan assembly of claim 2 , wherein the floor surface comprises a plurality of drain holes.

4. The fan assembly of claim 3 , wherein the drain holes are angularly spaced about the outer cavity.

5. The fan assembly of claim 3 , wherein the drain holes are located adjacent the outer wall.

6. The fan assembly of claim 2 , wherein the floor surface is inclined downwardly from the inner wall towards the outer wall.

7. The fan assembly of claim 1 , wherein the outer wall and the inner wall are annular.

8. The fan assembly of claim 1 , wherein the inner wall is taller than the outer wall.

9. The fan assembly of claim 1 , wherein a bottom surface of the body is provided with a plurality of feet for supporting the fan assembly.

10. The fan assembly of claim 1 , further comprising a filter surrounding at least a portion of the body upstream from the air inlet.

11. The fan assembly of claim 10 , wherein the filter is tubular and surrounds at least a portion of the body.

12. The fan assembly of claim 11 , wherein the filter extends 360° around the body.

13. The fan assembly of claim 10 , wherein the filter extends radially around at least a portion of the body.

14. The fan assembly of claim 10 , wherein the filter comprises a filter media comprising a HEPA filter.

15. The fan assembly of claim 10 , wherein the filter comprises a filter media comprising an activated carbon cloth.

16. The fan assembly of claim 10 , wherein the filter comprises a perforated shroud surrounding a filter media of the filter.

17. The fan assembly of claim 10 , wherein the body comprises a seat for the supporting the filter.

18. The fan assembly of claim 17 , wherein the seat comprises an upwardly facing surface.

19. The fan assembly of claim 17 , wherein the seat is substantially orthogonal to a longitudinal axis of the body.

20. The fan assembly of claim 17 , wherein an outer edge of the seat is substantially flush with an outer surface of the lower body section.

21. The fan assembly of claim 1 , wherein the lower body section and the upper body section are cylindrical and a diameter of the lower body section is larger than a diameter of the upper body section.

22. The fan assembly of claim 1 , wherein the upper body section rotates relative to the lower body section.

23. The fan assembly of claim 1 , wherein the oscillation mechanism is located within the inner cavity of the lower body section.

24. The fan assembly of claim 1 , wherein the nozzle defines an opening through which air from outside the fan assembly is drawn by the air emitted from the nozzle.