Fan

1. A fan assembly comprising:

a body comprising an inlet, an outlet and an air flow generator for generating an air flow through the body; and

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

wherein the body and the nozzle have cooperative inclined surfaces configured to assist alignment of the nozzle on the body,

wherein the cooperative inclined surface on the body comprises a top edge of the body, the top edge having an undulating surface and a locating notch depending downwardly from the top edge;

wherein the cooperative inclined surface on the nozzle comprises an undulating surface located in an annular channel in a base of the nozzle, the annular channel being defined by an outer annular wall and an inner annular wall;

wherein an outer surface of the inner annular wall seals against an annular sealing member provided on the body; and

wherein the nozzle is provided with ribs which extend across the channel that are arranged to be received in the locating notch.

2. The fan assembly of claim 1 , further comprising a nozzle retainer for releasably retaining the nozzle on the body.

3. The fan assembly of claim 2 , wherein the nozzle retainer has a first configuration in which the nozzle is retained on the body and a second configuration in which the nozzle is released for removal from the body.

4. The fan assembly of claim 3 , comprising a manually actuable member located on the nozzle for effecting movement of the nozzle retainer from the first configuration to the second configuration.

5. The fan assembly of claim 3 , comprising a manually actuable member located on the body for effecting movement of the nozzle retainer from the first configuration to the second configuration.

6. The fan assembly of claim 1 , wherein the body is cylindrical.

7. The fan assembly of claim 2 , wherein an outer surface of the body comprises recesses for receiving a portion of the nozzle retainer.

8. The fan assembly of claim 1 , wherein the inclined surfaces define opposing pairs of peaks and troughs.

9. The fan assembly of claim 8 , wherein the recesses are located on the peaks.

10. The fan assembly of claim 1 , further comprising a filter upstream from the air inlet.

11. The fan assembly of claim 10 , comprising a sealing member for forming a seal between the filter and the body to define a flow path between a downstream surface of the filter and the air inlet.

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

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

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

15. The fan assembly of claim 10 , wherein when the filter is supported on a seat which extends radially from an outer surface of the body.

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

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

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

19. 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.