Fan

Abstract

A portable fan includes a casing having an air inlet, and an air outlet having an interior passage for receiving an air flow, and a mouth for emitting the air flow, the interior passage extending about an opening through which air is drawn by the air flow emitted from the mouth. The fan includes an impeller and a motor for rotating the impeller to generate an air flow between the air inlet and an air outlet which has a static pressure of at least 150 Pa downstream from the impeller. A filter unit is detachably connected to the casing. A filter of the filter unit is located upstream of the air inlet to remove airborne particulates from the air flow before it enters the casing.

1 . A portable fan comprising:
 a casing having an air inlet;   an air outlet comprising an interior passage for receiving an air flow, and a mouth for emitting the air flow, the interior passage extending about an opening through which air is drawn by the air flow emitted from the mouth;   an impeller and a motor for rotating the impeller to generate an air flow between the air inlet and an air outlet which has a static pressure of at least 150 Pa downstream from the impeller; and   a filter unit detachably connected to the casing, the filter unit comprising a filter located upstream of the air inlet.   
     
     
         2 . The fan of  claim 1 , wherein the motor and the impeller are arranged to generate an air flow having a static pressure in the range from 250 to 1.5 kPa. 
     
     
         3 . The fan of  claim 1 , wherein the filter unit comprises at least one seal for engaging an outer surface of the casing. 
     
     
         4 . The fan of  claim 1 , wherein the filter unit is in the form of a sleeve locatable about the casing. 
     
     
         5 . The fan of  claim 1 , wherein the filter is substantially annular in shape. 
     
     
         6 . The fan of  claim 5 , wherein the filter unit comprises two annular discs between which the filter is located. 
     
     
         7 . The fan of  claim 6 , wherein each disc comprises a raised rim extending towards the other disc for retaining the filter between the discs. 
     
     
         8 . The fan of  claim 6 , wherein the filter is adhered to the discs. 
     
     
         9 . The fan of  claim 1 , wherein the filter unit comprises a filter housing, and the filter is adhered to the filter housing. 
     
     
         10 . The fan of  claim 1 , wherein the filter unit comprises an outer cover comprising a plurality of apertures. 
     
     
         11 . The fan of  claim 1 , wherein the casing comprises a base surface and a side wall, and wherein the air inlet is located in the side wall of the casing. 
     
     
         12 . The fan of  claim 1 , wherein the air inlet extends at least partially about the casing. 
     
     
         13 . The fan of  claim 1 , wherein the air inlet comprises an array of apertures. 
     
     
         14 . The fan of  claim 1 , wherein the casing is substantially cylindrical in shape. 
     
     
         15 . The fan of  claim 1 , wherein the air outlet is detachably connected to the filter unit. 
     
     
         16 . The fan of  claim 1 , wherein the filter unit comprises a first seal for engaging the casing, and a second seal for engaging the air outlet.