A fan assembly for creating an air current includes a base having an air inlet and an air outlet, the base housing an impeller and a motor for rotating the impeller to create an air flow passing from the air inlet to the air outlet. The fan assembly further includes a vertically oriented, elongate a
A fan assembly for creating an air current includes a base having an air inlet and an air outlet, the base housing an impeller and a motor for rotating the impeller to create an air flow passing from the air inlet to the air outlet. The fan assembly further includes a vertically oriented, elongate annular nozzle including an interior passage having an air inlet for receiving the air flow from the base and a mouth for emitting the air flow, the nozzle defining an opening through which air from outside the fan assembly is drawn by the air flow emitted from the mouth.
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1. A fan assembly for creating an air current, the fan assembly comprising: a base having an air inlet and an air outlet, the base housing: an impeller, anda motor configured to rotate the impeller to create an air flow passing from the air inlet to the air outlet; anda vertically oriented, elongate
1. A fan assembly for creating an air current, the fan assembly comprising: a base having an air inlet and an air outlet, the base housing: an impeller, anda motor configured to rotate the impeller to create an air flow passing from the air inlet to the air outlet; anda vertically oriented, elongate annular nozzle comprising: an annular inner casing section and an annular outer casing section,an interior passage, formed between the annular inner casing and the annular outer casing, configured to receive the air flow from the base,a mouth configured to emit the air flow, the mouth comprising a slot-shaped outlet, anda plurality of guide vanes located within the interior passage, each of the guide vanes comprising a surface such that the air flow conveyed in a substantially vertical direction through the interior passage impinges upon the surfaces to guide the air flow in a substantially horizontal direction towards the mouth,the nozzle defining an opening through which air from outside the fan assembly is drawn by the air flow emitted from the mouth. 2. The fan assembly of claim 1, wherein the interior passage is shaped to divide the air flow into two air streams and to direct each air stream along a respective side of the opening. 3. The fan assembly of claim 1, wherein the slot-shaped outlet has a width in the range from 0.5 to 5 mm. 4. The fan assembly of claim 1, wherein the mouth comprises a plurality of said slot-shaped outlets spaced about the opening. 5. The fan assembly of claim 4, wherein each of the slot-shaped outlets is substantially vertically oriented. 6. The fan assembly of claim 5, wherein the slot-shaped outlets are of substantially the same size. 7. The fan assembly of claim 1, wherein the interior passage extends about the opening by a distance in the range from 500 to 2500 mm. 8. The fan assembly of claim 1, wherein the nozzle comprises a surface located adjacent the mouth and over which the mouth is arranged to direct the air flow. 9. The fan assembly of claim 8, wherein the surface of the nozzle is a Coanda surface. 10. The fan assembly of claim 8, wherein the nozzle comprises a diffuser located downstream of the Coanda surface. 11. The fan assembly of claim 1, wherein the air inlet of the base comprises a grille comprising an array of apertures. 12. The fan assembly of claim 1, wherein the air outlet of the base is arranged to convey the air flow in the substantially vertical direction into the nozzle. 13. The fan assembly of claim 1, wherein the base has a height in the range from 100 to 300 mm. 14. The fan assembly of claim 1, wherein the base is substantially cylindrical. 15. The fan assembly of claim 1, wherein the motor is a DC brushless motor. 16. The fan assembly of claim 1, wherein the fan assembly has a height in the range from 600 to 1500 mm. 17. The fan assembly of claim 1, in the shape of a portable tower fan. 18. The fan assembly of claim 1, wherein the guide vanes are curved to direct the air flow passing along the interior passage towards the mouth. 19. The fan assembly of claim 1, wherein the guide vanes are aligned in the substantially vertical direction. 20. The fan assembly of claim 1, wherein the guide vanes are evenly spaced apart to define a plurality of passageways between the guide vanes and through which the air flow is directed towards the mouth. 21. The fan assembly of claim 1, wherein the guide vanes urge apart overlapping portions of the annular inner casing section and the annular outer casing section at the mouth. 22. A portable tower fan comprising, a base having an air inlet and an air outlet, the base housing: an impeller, anda motor configured to rotate the impeller to create an air flow passing from the air inlet to the air outlet; anda vertically oriented, elongated annular casing comprising: an annular inner casing section and an annular outer casing section,an interior passage, formed between the annular inner casing and the annular outer casing, configured to receive the air flow from the base,a mouth configured to emit the air flow, the mouth comprising a slot-shaped opening, anda plurality of guide vanes located within the interior passage, each of the guide vanes comprising a surface such that the air flow conveyed in a substantially vertical direction through the interior passage impinges upon the surfaces to guide the air flow in a substantially horizontal direction towards the mouth,the annular casing defining an opening through which air from outside the fan assembly is drawn by the air flow emitted from the mouth. 23. The fan of claim 22, wherein the interior passage is shaped to divide the air flow into two air streams and to direct each air stream along a respective side of the opening. 24. The fan of claim 22, wherein the slot-shaped opening has a width in the range from 0.5 to 5 mm. 25. The fan of claim 22, wherein the mouth comprises a plurality of said slot-shaped openings spaced about the opening. 26. The fan of claim 25, wherein each of the slot-shaped openings is substantially vertically oriented. 27. The fan of claim 26, wherein the slot-shaped openings are of substantially the same size. 28. The fan of claim 22, wherein the interior passage extends about the opening by a distance in the range from 500 to 2500 mm. 29. The fan of claim 22, wherein the casing comprises a surface located adjacent the mouth and over which the mouth is arranged to direct the air flow. 30. The fan of claim 29, wherein the surface of the casing is a Coanda surface. 31. The fan of claim 29, wherein the casing comprises a diffuser located downstream of the Coanda surface. 32. The fan of claim 22, wherein the air inlet of the base comprises a grille comprising an array of apertures. 33. The fan of claim 22, wherein the air outlet of the base is arranged to convey the air flow in the substantially vertical direction into the casing. 34. The fan of claim 22, wherein the base has a height in the range from 100 to 300 mm. 35. The fan of claim 22, wherein the base is substantially cylindrical. 36. The fan of claim 22, wherein the motor is a DC brushless motor. 37. The fan of claim 22, wherein the guide vanes are curved to direct the air flow passing along the interior passage towards the mouth. 38. The fan of claim 22, wherein the guide vanes are aligned in the substantially vertical direction. 39. The fan of claim 22, wherein the guide vanes are evenly spaced apart to define a plurality of passageways between the guide vanes and through which the air flow is directed towards the mouth. 40. The fan of claim 22, wherein the guide vanes urge apart overlapping portions of the annular inner casing section and the annular outer casing section at the mouth.
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