Patent Publication Number: US-9420864-B2

Title: Hand held appliance

Description:
REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority of United Kingdom Application No. 1312066.2, filed Jul. 5, 2013, the entire contents of which are incorporated herein by reference. 
     FIELD OF THE INVENTION 
     This invention relates to a hand held appliance, in particular a hair care appliance such as a hairdryer. 
     BACKGROUND OF THE INVENTION 
     Blowers and in particular hot air blowers are used for a variety of applications such as drying substances such as paint or hair and cleaning or stripping surface layers. In addition, hot air blowers such as hot styling brushes are used to style hair from a wet or dry condition. 
     Generally, a motor and fan are provided which draw fluid into a body; the fluid may be heated prior to exiting the body. The motor is susceptible to damage from foreign objects such as dirt or hair so conventionally a filter is provided at the fluid intake end of the blower. Conventionally such appliances are provided with a nozzle which can be attached and detached from the appliance and changes the shape and velocity of fluid flow that exits the appliance. Such nozzles can be used to focus the outflow of the appliance or to diffuse the outflow depending on the requirements of the user at that time. 
     SUMMARY OF THE INVENTION 
     According to a first aspect, the invention provides a hair care appliance comprising a body comprising an outer wall, and a handle comprising an outer wall and a wall disposed within the outer wall wherein, the outer wall of the body and the wall of the handle are formed as a single unit. 
     Forming the body and the wall of the handle as a single unit has a number of advantages. Firstly the access to at least some of the components of the appliance is made more difficult. In convention hairdryers, a clam shell construction is used and the two parts are usually screwed together. A user can relatively easily remove the screws and access the heater and fan unit. In the present invention, as there are no joins or screws that can be removed, it is made more difficult for a user to take the product apart. Secondly, the product is visually cleaner. There are no join lines running along the length of the body and no recesses or extensions in the body that would be required in order to connect the two parts. 
     Preferably, the wall comprises an access aperture extending at least partially along and around the wall. 
     It is preferred that the wall comprises a hatch for closing the access aperture. 
     Preferably, the handle comprises a primary fluid inlet disposed at and/or near the distal end of the handle from the body. Preferably, the primary fluid inlet extends at least partially around and along the handle. Preferably, the primary fluid inlet comprises at least one aperture extending around the outer wall. It is preferred that the primary fluid inlet comprises at least one aperture extending along the outer wall. Preferably, the primary fluid inlet comprises at least one aperture extending across the outer wall. 
     Preferably, the handle comprises a primary fluid flow path flowing from the primary fluid inlet along the handle and into the body. It is preferred that the primary fluid flow path flows from the primary fluid inlet within the wall to the body. 
     Preferably, the handle comprises a fan unit wherein the fan unit draws fluid into the primary fluid flow path. 
     It is preferred that the body comprises a primary fluid outlet for the primary fluid flow path. Preferably, the primary fluid outlet is in fluid communication with the primary fluid inlet and the primary fluid flow path. 
     Preferably, the body comprises a first end and a second end and the primary fluid outlet is at the second end. 
     Preferably, the body comprises a fluid flow path. Preferably, the fluid flow path extends from a fluid inlet in the body to a fluid outlet. 
     It is preferred that the body comprises a duct extending within the outer wall of the body and the duct extends from the first end. 
     Preferably, the primary fluid flow path extends between the outer wall of the body and the duct. Preferably, the primary fluid flow path extends to a primary fluid outlet. 
     Preferably, the primary fluid flow path extends about the duct. Preferably, the primary fluid flow path extends at least partially along the duct. Preferably, the duct extends at least partially along the body. 
     In one aspect, the invention provides a hair care appliance comprising a body having a duct, an outer wall extending about the duct and a side wall extending between the duct and the outer wall, wherein a control switch is provided on the side wall and wherein the outer wall, side wall and the duct are all external walls of the appliance and wherein within the body a primary fluid flow path extends between the outer wall and the duct to a primary fluid outlet. 
     It is preferred that the duct defines a fluid flow path extending through the body. Preferably, the fluid flow path extends from a fluid inlet to a fluid outlet. Preferably, the fluid flow path extends within the duct. Preferably, the fluid flow path extends from a fluid inlet in the body through the duct to a fluid outlet from the body. 
     Preferably, the duct extends about the fluid flow path. Preferably, the fluid flow path extends through the duct. Preferably, the fluid flow path is defined by a duct extending through the body. Preferably, the fluid flow path exits the body by the fluid outlet. Preferably, the fluid flow path is provided through the duct. 
     It is preferred that the fluid inlet is at the first end of the body. 
     Preferably, the fluid flow path merges with the primary fluid flow path within the body. 
     Alternatively, the primary fluid flow path surrounds the fluid flow path at the second end of the body. Fluid in the primary fluid flow path exits the body by the primary fluid outlet. 
     Preferably, the duct is connected to the outer wall of the body by a side wall extending between the duct and the outer wall. It is preferred that the side wall is angled to both the outer wall of the body and the duct. Preferably, the side wall is disposed at the first end of the body. It is preferred that the duct and side wall are formed as a single unit. Preferably, the duct and side wall are formed from a plastic material. It is preferred that the side wall at least partially defines the fluid inlet into the fluid flow path. 
     Preferably, the outer wall of the handle extends about the wall and partially along the wall. It is preferred that the outer wall of the handle extends over an access hatch into the wall. 
     Preferably, the outer wall of the handle extends about the wall for substantially the whole length of the wall. It is preferred that the wall of the handle comprises a primary fluid inlet. Preferably, the primary fluid inlet of the outer wall of the handle is in fluid communication with the primary fluid inlet of the wall of the handle. 
     It is preferred that the outer wall of the body and wall of the handle are made from a plastic material. 
     Preferably, the outer wall of the handle is made from a different material to the wall of the handle and the outer wall of the body. Preferably, the outer wall is formed from a metal. Preferably, the outer wall of the handle is made from aluminium or an aluminium alloy. 
     It is preferred that the body comprises a heater. The heater is for heating fluid in the primary fluid flow path. Preferably, the heater is provided between the outer wall and the duct. It is preferred that the primary fluid flow path extends through the heater. Preferably, the heater extends along the body. It is preferred that the heater extends at least partially around the body. Alternatively, the heater extends around the body. It is preferred that the heater extends at least partially around and about the duct. Alternatively, the heater extends around about the duct. Preferably, the heater extends at least partially along the duct. Preferably, the heater is annular. 
     Also provided is a hand held appliance comprising a body comprising an outer wall; and a handle comprising an outer wall and a wall disposed within the outer wall wherein, the outer wall of the body and the wall of the handle are formed as a single unit. 
     According to a second aspect, the invention provides a hair care appliance comprising a body having a duct, an outer wall extending about the duct and a side wall extending between the duct and the outer wall, wherein a control switch is provided on the side wall and wherein the outer wall, side wall and the duct are all external walls of the appliance. 
     Preferably, the body has an inlet end and an outlet end and the side wall is at the inlet end. 
     It is preferred that the duct at least partially defines a fluid flow path through the body. Preferably, the duct is recessed within the outer wall at the inlet end. 
     Thus, according to another aspect, the invention provides a hair care appliance comprising a body having a duct, an outer wall extending about the duct and a side wall extending between the duct and the outer wall, wherein a control switch is provided on the side wall and wherein the outer wall, side wall and the duct are all external walls of the appliance and wherein the duct at least partially defines a fluid flow path through the body. 
     It is preferred that the handle is connected to the body at a first end. Preferably, a second control switch is provided on the handle. It is preferred that the second control switch is located on the handle adjacent to the inlet end of the body. 
     Preferably, both the first control switch and the second control switch are accessible by a single digit. 
     It is preferred that the second control switch comprises two buttons. 
     Preferably, the handle is generally tubular and at a distal end to the body the handle comprises a primary fluid inlet. It is preferred that the handle comprises a wall and at the distal end, the handle comprises an end wall extending across the wall. Preferably, the primary fluid inlet extends at least partially across the end wall. 
     It is preferred that the appliance comprises a power cable connectable to a power source at one end and extending into substantially the centre of the end wall of the handle at the other end. 
     Preferably, the handle comprises an outer wall and the outer wall extends at least partially along and around the wall. 
     Preferably, a lining material is provided between the outer wall and the wall. Preferably, the lining material is an insulating layer. Preferably, the lining material or insulating layer extends substantially continuously along and/or around the wall. 
     Preferably, the primary fluid outlet is at least partially defined by the duct. It is preferred that the primary fluid outlet is defined by the body and the duct. 
     Preferably, within the body, the primary fluid flow path and fluid flow path merge. 
     Preferably, the primary fluid outlet extends about the fluid flow path. Preferably, the body comprises a fluid outlet for the fluid flow path and the primary fluid outlet extends about the fluid outlet. 
     Preferably, the primary fluid outlet is at the outlet end of the body. 
     Preferably, the body decreases in diameter towards the outlet end. 
     Preferably, the first control switch comprises two buttons. 
     Also provided is a hand held appliance comprising a body having a duct, an outer wall extending about the duct and a side wall extending between the duct and the outer wall, wherein a control switch is provided on the side wall and wherein the outer wall, side wall and the duct are all external walls of the hand held appliance. 
     According to a third aspect, the invention provides a hair care appliance comprising a body, and a handle having a first end in fluid communication with the body and a second end comprising a primary fluid inlet into the appliance wherein the primary fluid inlet comprises a first aperture extending at least partially around the handle and a second aperture extending through the second end of the handle. 
     Having the primary fluid inlet disposed on more than one surface of the appliance is advantageous. In conventional hairdryers, the primary fluid inlet is generally located on the back end of the hairdryer and in an attempt to prevent blockage, the end is often convex. If the back end of the hairdryer is placed down on a hard surface, it will roll onto a side. 
     However, on a soft surface such as bedding or a long pile carpet, the inlet can still be at least partially covered or blocked. This can lead to overheating of the motor. By having the inlet on more than one surface, there is less chance of any blockage being sufficient to cause damage to the motor. 
     Preferably, the handle comprises an end wall at the second end and the second aperture extends through the end wall. 
     It is preferred that the end wall is substantially orthogonal to the handle. 
     Preferably, the first aperture is adjacent the second end of the handle. 
     It is preferred that the fan unit is upstream of the primary fluid inlet. 
     Preferably, the first aperture comprises a plurality of apertures extending at least partially around the handle. 
     It is preferred that the first aperture comprises a plurality of apertures extending at least partially along the handle. 
     Preferably, the second aperture comprises a plurality of apertures extending through the end of the handle. 
     Preferably, a power cable for supplying power to the fan unit is provided, the power cable extending through the end of the handle. It is preferred that the power cable extends substantially centrally through the handle at the primary fluid inlet. It is preferred that the second aperture extends at least partially around the power cable. 
     Preferably, a primary fluid flow path is provided from the primary fluid inlet through the handle and into the body to a primary fluid outlet. 
     It is preferred that the handle comprises a wall and the primary fluid flow path extends within the wall. It is preferred that the handle comprises an outer wall wherein said outer wall extends around the wall and at least partially along the wall. It is preferred that the handle comprises a layer of insulating material between the outer wall and the wall. 
     Preferably, the primary fluid outlet comprises a plurality of apertures extending at least partially along and around the body. 
     It is preferred that the primary fluid flow path is substantially linear through the handle and into the body. 
     Alternatively, the handle is substantially orthogonal to the body. 
     It is preferred that the within the body the primary fluid flow path surrounds the fluid flow path. 
     It is preferred that the primary fluid outlet extends about the fluid flow path. 
     According to a fourth aspect, the invention provides a hair care appliance comprising a handle, the handle comprising a wall and an outer wall wherein the wall defines a primary fluid flow path that extends from a primary fluid inlet into the appliance and the outer wall is an external surface of the appliance. 
     The provision of a double layered wall reduces the transmission of vibration and noise from within the handle. It isolates internal components of the handle from the outer wall. 
     Preferably, the outer wall extends substantially continuously around the wall. It is preferred that the outer wall extends substantially along the wall. 
     Preferably, the insulating layer mitigates one or more of noise, vibration and heat produced by the appliance. It is preferred that the insulating material is a foam or a felt. 
     It is preferred that the handle comprises a first end and a second end wherein the primary fluid inlet is at or near the second end. 
     Preferably, the handle includes a heater for heating fluid drawn into the primary fluid inlet. 
     Preferably, the heater is downstream of the fan unit. The heater is preferably disposed adjacent the first end of the handle. 
     Preferably, the appliance comprises a head attachable to the handle, the head comprising a primary fluid outlet for the appliance. Preferably, the primary fluid outlet comprises a plurality of apertures extending at least partially along and around the head. Preferably, the primary fluid flow path is substantially linear through the handle and into the head. 
     Alternatively, the primary fluid flow path from the primary fluid inlet to the primary fluid outlet is non linear. It is preferred that the primary fluid flows within the handle in a first direction and within the body in a second direction. Preferably, the primary fluid flow in the body is substantially orthogonal to the primary fluid flow in the handle. 
     It is preferred that fluid in the fluid flow path is entrained into the body by the action of a fan unit in the primary fluid flow path. 
     According to a fifth aspect, the invention provides a hair care appliance comprising a body, a fluid flow path extending through the body from a fluid inlet to a fluid outlet and a PCB extending about the fluid flow path. 
     Preferably, the PCB is annular. It is preferred that the PCB is isolated from the fluid flow path. 
     Preferably, the PCB comprises a first layer and a second layer. It is preferred that the first layer extends substantially continuously about the fluid flow path. Preferably, the second layer extends partially about the fluid flow path. 
     It is preferred that the second layer is adjacent the first layer. Preferably, the second layer is downstream of the first layer. 
     It is preferred that the PCB extends at least partially around extends about the duct. 
     Preferably, the primary fluid flow path is in fluid communication with the PCB. 
     It is preferred that the heater is downstream of the PCB. 
     Preferably, a thermal barrier is provided between the PCB and the heater. The thermal barrier is located fluidly between the PCB and the heater. 
     Preferably, comprising a handle wherein the handle attached to and extending from the body and the primary fluid inlet is in the handle is connected to the body at a first end. 
     It is preferred that the handle comprises a fan unit for drawing fluid into the primary fluid flow path. 
     Preferably, the handle comprises a second end distal to the first end, the second end comprising a primary fluid inlet. 
     It is preferred that the primary fluid flow path extends along the handle and into the body to a primary fluid outlet. 
     Preferably, the primary fluid flow path is non-linear. 
     It is preferred that within the handle the primary fluid flow path is generally circular. 
     Preferably, within the body the primary fluid flow path is generally annular. 
     It is preferred that where the primary fluid flow path enters the body a flow plate is provided. Preferably, the body comprises a flow plate for directing flow from the handle into the body. 
     Preferably, the flow plate deflects the primary flow around the duct from a circular to an annular flow. 
     It is preferred that the primary fluid flows through the handle in a first direction and in the body in a second direction. Preferably, the flow plate directs primary flow from the first direction to the second direction. 
     Preferably, the flow plate is provided in the primary fluid flow path to direct flow from a circular flow in the handle to an annular flow in the body. Preferably, the flow plate is adjacent to the PCB. 
     Preferably, the flow plate is shaped around components on the PCB. 
     Preferably, the flow plate deflects the primary flow from a first direction of flow within the handle to a second direction of flow within the body. 
     Preferably, the fan unit is upstream of the PCB. 
     According to a sixth aspect, the invention provides a hair care appliance comprising a body, a heater, a PCB and a primary fluid flow path extending from a primary fluid inlet into the appliance to a primary fluid outlet out of the body wherein the PCB and heater are in fluid communication with the primary fluid flow path and the PCB is upstream of the heater. 
     Preferably, a fan unit is provided and the fan unit is upstream of the heater. 
     Alternatively, a fan unit is provided and the fan unit is downstream of the PCB. 
     It is preferred that the thermal barrier is in thermal communication with the PCB and functions as a heat sink for the PCB. Preferably, the thermal barrier is aluminium or an alloy of aluminium. 
     It is preferred that the body includes a handle portion upstream of the heater. 
     Preferably, the primary fluid inlet is in the handle portion. It is preferred that the primary fluid flow path extends linearly through the body. 
     Preferably, the flow plate comprises at least one aperture. It is preferred that the at least one aperture enables fluid to flow through the flow plate to the PCB. 
     Preferably, the flow plate is connected to the PCB. The flow plate acts as a heat sink for the PCB. It is preferred that the flow plate additionally directs primary fluid flow around the PCB. 
     Preferably, the flow plate is additionally one or more of a thermal barrier, heat sink and deflector plate for the PCB. 
     It is preferred that where the primary flow enters the body there is a region of relatively high velocity flow. 
     Preferably, the PCB comprises components extending outwards from a board by different amounts and the components are arranged such that components that extend further out from the board are positioned radially away from the region of relatively high velocity flow. It is preferred that at least some of the components that extend further out from the board are capacitors. 
     Preferably, components that extend less distance from the board are positioned in the region of relatively high velocity flow. 
     It is preferred that the thermal barrier is additionally a deflector plate for deflecting debris from the PCB away from the primary fluid flow path and the primary fluid outlet. 
     According to a seventh aspect, the invention provides a hair care appliance comprising a body, a PCB having electrical components mounted thereon and a primary fluid flow path extending at least partially through the body and passed the PCB, wherein the primary fluid flow path has a region of relatively high velocity and a region of relatively low velocity and components mounted on the PCB are arranged so that larger components are in the region of relatively low velocity. 
     Preferably, the appliance comprises a handle connected to the body at a first end wherein the primary fluid flow path flows through the handle into the body. 
     It is preferred that the primary fluid flow path extends in a first direction within the handle and a second direction within the body. 
     Preferably, the body is generally tubular and has an upper half and a lower half and the handle is connected to the lower half. It is preferred that the region of relatively high velocity is in the lower half of the body. Preferably, the region of relatively low velocity is in the upper half of the body. 
     It is preferred that larger components of the PCB are located in the upper half of the body. Preferably, smaller components of the PCB are located in the lower half of the body. It is preferred that larger components of the PCB are components which extend the furthest from a circuit board on which they are mounted. 
     According to an eighth aspect, the invention provides, a hair care appliance comprising a body; a fluid flow path extending through the body from a fluid inlet through which a fluid flow enters the appliance to a fluid outlet for emitting the fluid flow from a front end of the body; and an attachment for adjusting at least one parameter of fluid emitted from the appliance, the attachment comprising an upstream end for attaching to the appliance, wherein one or both of the front end of the body and the upstream end of the attachment comprises at least one magnet. 
     Preferably, the front end of the body comprises an end wall extending radially inwards of the body and the end wall comprises at least one magnet. 
     It is preferred that end wall comprises a plurality of magnets radially spaced about the end wall. 
     Preferably, the end wall comprises a ring of magnetic material extending around the end wall. 
     Preferably, the end wall comprises an outer face and an inner face, the outer face being an external surface of the appliance, wherein the at least one magnet is adjacent the inner face. 
     It is preferred that the at least one magnet is embedded in the end face. 
     Preferably, the upstream end of the attachment comprises an end face and a plurality of magnets radially spaced about the end face. 
     It is preferred that the upstream end of the attachment comprises a ring of magnetic material extending around the end face. 
     Preferably, the magnet or magnetic material is made from a polymer containing magnetic flakes. 
     It is preferred that an external surface of the magnet or magnetic material is coated with an anti scratch coating. 
     Preferably, the appliance comprises a primary fluid flow path extending at least partially through the body from a primary fluid inlet through which a primary fluid flow enters the appliance to a primary fluid outlet. 
     It is preferred that the appliance comprises a handle wherein the primary fluid inlet is in the handle. 
     Preferably, fluid flow is drawn through the fluid flow path by fluid emitted from the primary fluid outlet. 
     It is preferred that the primary fluid flow extends about the duct. 
     Preferably, the attachment is configured to inhibit emission of the fluid flow from the appliance. It is preferred that the attachment includes means to inhibit generation of a fluid flow along the fluid flow path to the fluid outlet. Preferably, the means to inhibit the generation of a fluid flow comprises a barrier which blocks the duct when the attachment is attached to the appliance. 
     It is preferred that the attachment is in the form of a nozzle defining a nozzle fluid flow path extending from a nozzle fluid inlet through which the primary fluid flow enters the nozzle to a nozzle fluid outlet for emitting the primary fluid flow. 
     Preferably, the attachment has an outer wall that substantially continues the profile of the body at the front end of the body. 
     It is preferred that the body reduces in diameter towards the front end of the body. Preferably, the reduction in diameter has a constant gradient. 
     It is preferred that the appliance comprises a body a fluid flow path extending through the body from a fluid inlet through which a fluid flow enters the appliance to a fluid outlet for emitting the fluid flow from a front end of the body wherein the front end of the body comprises at least one magnet. 
     Preferably, the front end of the body comprises an end wall extending radially inwards of the body and the end wall comprises at least one magnet. 
     It is preferred that the end wall comprises a plurality of magnets radially spaced about the end wall. 
     Preferably, the end wall comprises a ring of magnetic material extending around the end wall. 
     The invention also provides an attachment for adjusting at least one parameter of fluid emitted from the appliance comprising an upstream end for attaching to the appliance, wherein the upstream end of the attachment comprises at least one magnet. 
     According to a ninth aspect, the invention provides a hair care appliance having a handle, and a body, the body having an outer wall and a duct wherein the outer wall extends about the duct and the outer wall converges towards the duct. 
     Preferably, the outer wall has a first part and a second part and the first part is tubular. 
     It is preferred that the first part is of substantially uniform diameter. 
     Preferably, the second part is cone shaped. 
     It is preferred that the second part of the outer wall converges towards the duct at an angle of between 1 and 89°. 
     Preferably, the second part of the outer wall converges towards the duct at an angle of between 30 and 60°. 
     Preferably, the appliance comprises a fan unit for drawing fluid into the primary fluid flow path from a primary fluid inlet to a primary fluid outlet. 
     It is preferred that the body comprises the primary fluid outlet at one end and wherein the outer wall converges towards the duct towards the primary fluid outlet. 
     Preferably, the body has a first end and a second end and the outer wall converges towards the duct at the second end of the body. 
     Preferably, the appliance comprises a handle having a primary fluid inlet in fluid communication with the primary fluid flow path. 
     It is preferred that fluid is entrained into the fluid flow path by the action of a fan unit drawing fluid into the primary fluid flow path. 
     Preferably, the primary fluid flow path extends about the fluid flow path. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will now be described by way of example with reference to the accompanying drawings, of which: 
         FIGS. 1 and 2  show different aspects of a hairdryer according to the invention; 
         FIG. 3  shows a cross section though a hairdryer according to the invention; 
         FIGS. 4 a  and 4 b    show enlarged views of portions of the cross section of  FIG. 3 ; 
         FIGS. 5, 6 and 7  show different views of parts of a hairdryer according to the invention; 
         FIGS. 8 a  and 8 b    show respectively a cross section through and a perspective of alternate hair care appliance; 
         FIGS. 9 and 10  show different views of a hairdryer according to the invention; 
         FIG. 11 a    shows a top sectional view along line M-M of  FIG. 1 ; 
         FIG. 11 b    shows a top sectional view along line L-L of  FIG. 1 ; 
         FIGS. 12 a , 12 b  and 12 c    show views of various internal components of the body of a hairdryer according to an invention; 
         FIGS. 13 to 16  show various views of a hairdryer having an attachment for changing a parameter of fluid output from the hairdryer; and 
         FIGS. 17 a  and 17 b    show different constructions of a magnetic connection between a hairdryer and an attachment. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIGS. 1 and 2  show a hairdryer  10  with a handle  20  and a body  30 . The handle has a first end  22  which is connected to the body  30  and a second end  24  distal from the body  30  and which includes a primary inlet  40 . Power is supplied to the hairdryer  10  via a cable  50 . 
     The body  30  has a first end  32  and a second end  34  and can be considered to have two parts. A first part  36  which extends from the first end  32  which is tubular and of a generally consistent diameter and a second part  38  which extends from the second end  34  to join the first part  36 . The second part  38  is cone shaped and varies in diameter along its length from the diameter of the first part  36  of the body  30  to a smaller diameter at the second end  34  of the body. In this example, the second part  38  has a constant gradient and the angle α subtended from the outer wall  360  of the first part  36  of the body  30  is around 40°. 
     Referring now to  FIGS. 2, 3, 4   a  and  4   b  in particular the handle  20  has an outer wall  200  which extends from the body  30  to a distal end  24  of the handle. At the distal end  24  of the handle an end wall  210  extends across the outer wall  200 . The cable  50  enters the hairdryer through this end wall  210 . The primary inlet  40  in the handle  20  includes first apertures that extend around and along  42  the outer wall  200  of the handle and second apertures that extend across  46  and through the end wall  210  of the handle  20 . The cable  50  is located approximately in the middle of the end wall  210  so extends from the centre of the handle  20 . The end wall  210  is orthogonal to the outer wall  200  and inner wall  220  of the handle. 
     It is preferred that the cable  50  extends centrally from the handle  20  as this means the hairdryer is balanced regardless of the orientation of the handle  20  in a users&#39; hand. Also, if the user moves the position of their hand on the handle  20  there will be no tugging from the cable  50  as it does not change position with respect to the hand when the hand is moved. If the cable were offset and nearer one side of the handle then the weight distribution of the hairdryer would change with orientation which is distracting for the user. 
     Upstream of the primary inlet  40 , a fan unit  70  is provided. The fan unit  70  includes a fan and a motor. The fan unit  70  draws fluid through the primary inlet  40  towards the body  30  through a fluid flow path  400  that extends from the primary inlet  40  and into the body  30  where the handle  20  and the body  30  are joined  90 . The fluid flow path  400  continues through the body  30  towards the second end  34  of the body, around a heater  80  and to a primary fluid outlet  440  where fluid that is drawn in by the fan unit exits the primary fluid flow path  400 . The primary fluid flow path  400  is non linear and flows through the handle  20  in a first direction and through the body  30  in a second direction which is orthogonal to the first direction. 
     The body  30  includes an outer wall  360  and an inner duct  310 . The primary fluid flow path  400  extends along the body from the junction  90  of the handle  20  and the body  30  between the outer wall  360  and the duct  310  towards the primary fluid outlet  440  at the second end of the body  30 . 
     Another fluid flow path is provided within the body; this flow is not directly processed by the fan unit or the heater but is drawn into the hairdryer by the action of the fan unit producing the primary flow through the hairdryer. This fluid flow is entrained into the hairdryer by the fluid flowing through the primary fluid flow path  400 . 
     The first end  32  of the body includes a fluid inlet  320  and the second end  34  of the body includes a fluid outlet  340 . Both the fluid inlet  320  and the fluid outlet  340  are at least partially defined by the duct  310  which is an inner wall of the body  30  and extends within and along the body. A fluid flow path  300  extends within the duct from the fluid inlet  320  to the fluid outlet  340 . At the first end  32  of the body  30 , a side wall  350  extends between the outer wall  360  and the duct  310 . This side wall  350  at least partially defines the fluid inlet  320 . At the second end  34  of the body a gap  370  is provided between the outer wall  360  and the duct, this gap  370  defines the primary fluid outlet  440 . The primary fluid outlet  440  is annular and surrounds the fluid flow path. The primary fluid outlet  440  may be internal so the primary fluid flow path  400  merges with the fluid flow path  300  within the body  30 . Alternatively, the primary fluid outlet  440  is external and exits from the body  30  separately to the fluid from the fluid flow path  300  at the fluid outlet  340 . 
     The outer wall  360  of the body converges towards the duct  310  and a centre line A-A of the body  30 . Having an outer wall  360  that converges towards the duct  310  has the advantage that the primary flow exiting the primary fluid outlet  440  is directed towards the centre line A-A of the body  30 . The fluid exiting the primary fluid outlet  440  will cause some external entrainment of fluid  490  from outside the hairdryer due to the movement of the fluid from the primary outlet  440 . This effect is increased by the outer wall  360  converging towards the duct  310 . Partly this is because the primary flow is focused rather than divergent and partly this is because of the slope of the outer wall  360  of the body  30  towards the second end  34  of the hairdryer. 
     The duct  310  is an internal wall of the hairdryer that can be accessed from outside the hairdryer. Thus, the duct  310  is an external wall of the hairdryer. The duct  310  is recessed within the body  30  so the side wall  350  that connects between the outer wall  360  and the duct  310  is angled with respect to the outer wall  360 . The angle β is around 115° from a line subtended by the outer wall  360  of the body  30  ( FIG. 4 b   ). 
     A PCB  75  including the control electronics for the hairdryer is located in the body  30  near the side wall  350  and fluid inlet  320 . The PCB  75  is ring shaped and extends round the duct  310  between the duct  310  and the outer wall  360 . The PCB  75  is in fluid communication with the primary fluid flow path  400 . The PCB  75  extends about the fluid flow path  300  and is isolated from the fluid flow path  300  by the duct  310 . 
     The PCB  75  controls such parameters as the temperature of the heater  80  and the speed of rotation of the fan unit  70 . Internal wiring (not shown) electrically connects the PCB  75  to the heater  80  and the fan unit  70  and the cable  50 . Control buttons  62 ,  64  are provided and connected to the PCB  75  to enable a user to select from a range of temperature settings and flow rates for example. 
     In use, fluid is drawn into the primary fluid flow path  400  by the action of the fan unit  70 , is optionally heated by the heater  80  and exits from the primary fluid outlet  440 . This processed flow causes fluid to be entrained into the fluid flow path  300  at the fluid inlet  320 . The fluid combines with the processed flow at the second end  34  of the body. In the example shown in  FIG. 3 , the processed flow exits the primary fluid outlet  440  and the hairdryer as an annular flow which surrounds the entrained flow that exits from the hairdryer via the fluid outlet  340 . Thus fluid that is processed by the fan unit and heater is augmented by the entrained flow. 
       FIGS. 5 to 7  all show exploded views of the different parts that the hairdryer  10  is formed from. Instead of a conventional clamshell hairdryer having two outer parts which require external fixings such as screws this hairdryer is made without such external fixings. 
     A first piece is the outer wall  200  of the handle  20  including the primary inlet  40  and cable  50 . A second piece comprises the duct  310  and side wall  350  of the body  30 . A third piece is the outer wall  360  of the body  30  and an inner wall  220  of the handle  20 . The second and third pieces are manufactured as single units. This has two advantages; a first is that it enables tight tolerances to be reproduced between the duct  310  and the outer wall  360  of the body  30  and the second is that there are no unseemly joins in the body  30 . By manufacturing the hairdryer out of these three main components, both the function and the form of the hairdryer are easily maintained. In addition, there is a safety aspect as an end user would find is difficult to dissemble the hairdryer using normal household tools. 
     The third piece comprising outer wall  360  of the body  30  and inner wall  220  of the handle  20  are moulded as a one piece unit from a plastic material. The second piece comprising the duct  310  and the side wall  350  is also moulded from a plastic material. Suitable plastic materials include polycarbonate, glass-filled PPA (Polyphthalamide), PPS (Polyphenylene Sulphide), LCAP (Liquid Crystal Aromatic Polymer) or PEEK (Polyether ether ketone) and the skilled person will appreciate that this list is not exhaustive. The outer wall  200  of the handle  20  can be made from any of a number of suitable materials but is preferably made from aluminium, an alloy of aluminium a steel or a stainless steel. 
     In order to assemble internal components of the hairdryer an access hatch  222  is provided in the inner wall  220  of the handle  20 . This enables the fan unit  70  to be positioned and wiring that connects the fan unit  70 , the heater  80 , control buttons  62 ,  64  and PCB  75  to the cable  50  to be connected simply and with relative speed. The heater  80  and PCB  75  are located around the duct  310  which is inserted into the body  30 , the wiring is connected and the access hatch  222  is placed over the corresponding hole  224  in the inner wall  220  of the handle  20 . The side wall  350  seals the first end  32  of the body  30 . This stops both two things, fluid being entrained into the primary fluid flow path  400  at the first end  32  of the body and fluid that has been processed by the fan unit  70  from exiting the body  30  at the first end  32 . 
     In the example shown with respect to  FIGS. 5, 6 and 7  the control buttons  62  on the handle are on the side of the handle that faces the fluid outlet  340 . 
     The hatch  222  needs to be of a size large enough to enable wiring connections to be made to the electrical components and can be at any location around the handle. The hatch may extend for the whole length of the inner wall  220  and is locatable at any orientation around the inner wall  220 . 
     Referring now particular for  FIGS. 3, 4   a  and  5  to  7 , the construction of the handle will be discussed. The handle  20  has an outer wall  200  and an inner wall  220 . The inner wall  220  is a duct which surrounds and defines a primary fluid flow path  400  through the hairdryer. The outer wall  200  includes a grippable portion and in this example, includes the primary inlet  40  into the primary fluid flow path  400 . Within the inner  220  wall, an insulating layer of material  212  is provided. The insulating layer is a foam or a felt and insulates the handle from noise produced by the fan unit  70 , heat produced by the operation of the hairdryer, vibrations caused by the fan unit and noise produced within the hairdryer by the flow of fluid through the primary fluid flow path  400 . 
     Alternatively or additionally, insulating layer of material  212  is provided between the outer wall  210  and inner wall  220 . This is described in relation to  FIG. 8   a.    
     As a minimum, the insulating material  212  is positioned around the fan unit  70  and preferably around the access hatch  222 . However, it is preferred that the insulating material  212  is substantially continuous around the inner  220  wall and extends for the length of the inner wall  220  of the handle as this has the most impact on insulating the handle. The insulating material  212  may also extend around the primary inlet  40  to reduce any noise produced directly by fluid being drawn into the primary fluid flow path  400 . 
     In this example, the outer wall  200  includes the primary fluid inlet  40 ; however it is not essential that the outer wall extends over the entire length of the inner wall  20 . The outer wall  200  should extend over the access hatch  222  and the region of the handle  20  that contains the fan unit  70  for insulation purposes and for aesthetic and safety reasons to both hide and prevent access to the access hatch  222  by a user. In the event that the outer wall  200  does not extend the entire length of the inner wall  220 , then either the inner wall  220  would comprise the inlet  40  at its&#39; distal end from the junction  90  with the body  30  or a separate inlet body attachable to the outer wall  200  and/or inner wall  220  could be provided. 
     The outer wall  200  is positioned with respect to the inner wall  220  and then secured in place. The outer wall  200  is for example, secured by plasma welding as this prevents user removal and thus access to sensitive components and also provides a clean join. 
       FIGS. 8 a  and 8 b    show an alternate hair care appliance having a similar primary inlet  540 . In this example, the hair care appliance is a hot styling brush  500  and it has a handle  520  and a detachable head  530  which is attachable at the distal end  522  of the handle  520  to the primary inlet  540 . 
     The handle  520  has an outer wall  526  which is generally tubular and includes the primary inlet  540  at and adjacent one end  524 . The primary inlet  540  comprises a first set of apertures  544  which extend radially around the handle  520  and along the outer wall  526  of the handle from the handle end  524 . The handle end  524  is covered by an end wall  510  which is also perforated with a second set of apertures  546  that extend through the end wall  510  of the handle. Thus, the primary inlet  540  extends around, along and across the handle  520 . The end wall  510  is orthogonal to the outer wall  526  and inner wall  560  of the handle. 
     The handle  520  also includes a fan unit  570  which comprises a fan and a motor which drives the fan and in use, draws fluid in through the primary inlet  540 , along a fluid flow path  550  which extends through the length of the handle  520 . The fluid is optionally heater by a heater  580  before entering an inner cavity  538  of the head  530 . 
     The head  530  includes a fluid outlet which in this example comprises two sets of parallel slots  534  each extending towards an end  536  of the head and radially around the head  530  with one set of slots  534   a  being upstream of a second set of slots  534   b . This arrangement enables fluid to exit the head all the way around the head and for the majority of the length of the head  530  maximising a hair styling region of the product. 
     The head  530  also includes bristles  532  which extend radially away from the head  530 . The bristles  532  are formed as parallel lines which extend radially around the head. Each set of bristles is located between two adjacent slots  534  but bristles need not be provided between every pair of slots. 
     In use, hair is wrapped around the head  530 . The bristles  534  retain the hair whilst hot air or fluid exits through the slots drying the hair and styling the hair into curls or waves. 
     Power is provided to the appliance via a power cable  548  which preferably extends from a plug or other power source through the end wall  510  of the handle  520 . The handle  520  also houses a PCB  575  which is electrically connected to the cable  548 , the fan unit  570  and the heater  580  by internal wiring (not shown). Control buttons  555  are provided and connected to the PCB  575  to allow the user to select one of a range of temperature and flow settings. The control buttons  555  are push buttons or slide buttons, for example. 
     The handle  520  has an outer wall  526  and an inner wall  560 . The inner wall  560  is a duct which surrounds and defines a fluid flow path  550  through the appliance. The outer wall  526  includes a grippable portion and in these examples, includes the primary inlet  540  into the fluid flow path  550 . In between the outer  526  and inner  560  walls, an insulating layer of material  528  is provided. The insulating layer is a foam or a felt and insulates the handle from noise produced by the fan unit  570 , heat produced by the operation of the appliance, vibrations caused by the fan unit and noise produced within the appliance by the flow of fluid through the fluid flow path  550 . 
     As a minimum, insulating material is positioned around the fan unit  570 . However, it is preferred that the insulating material  528  is substantially continuous between the outer  526  and inner  560  handles and extends for the length of the inner wall  560  of the handle as this has the most impact on insulating the handle. The insulating material  528  may also extend around the primary inlet  540  to reduce any noise produced directly by fluid being drawn into the fluid flow path  550 . 
     The primary inlet  40 ,  540  comprises a plurality of apertures extending around, along and across the handle  20 ,  520 . Having an inlet that extends in three dimensions has advantages particularly when used with hair grooming appliances. Firstly, if the appliance is placed on a surface whilst switched on only a small part of the inlet surface area will be blocked or have restricted flow of fluid into the appliance. This protects the fan unit and particularly the motor of the fan unit from running with too low a flow rate as this can cause overheating of the motor and cause damage to the motor. 
     Secondly, often hair care appliances are used with a styling product such as a mousse, gel or spray. These products are typically either applied by a hand or directly to the hair as a mist. After application by a hand, some of the product will be retained on the skin which is then transferred to the appliance when held. This can block at least some of the apertures  42 ,  544  that extend around and along the handle  20 ,  520 . However, the apertures  46 ,  546  that extend under the handle and across the end wall  210 ,  510  of the handle will be unaffected. When a product is applied as a mist, it can settle on the appliance and again block or restrict at least some of the apertures of the primary inlet  40 ,  540 . However, by having apertures that extend around, along and across the handle  20 ,  520 , the risk of blocking the primary inlet  40 ,  540  is reduced. 
     The apertures are preferably circular with a diameter of 0.2 to 1.6 mm. The diameter of the apertures can vary along, around and across the handle  20 ,  520 . It is advantageous to space the apertures regularly around, along and across the primary inlet  40 ,  540 . Not only is this visually pleasing but it also has the technical advantage that there is no weak region of the primary inlet  40 ,  540  where blockage of a portion is more likely or would have more impact on the flow into the primary inlet  40 ,  540 . The inlet is designed so that the flow into the inlet is even at least around the circumference of the handle  20 ,  520 . 
     It is preferred that the handle is made from a metallic material so any styling product that sticks to the handle and does block the primary inlet  40 ,  540  is easily removed and only temporarily blocks any apertures. 
     Referring now to  FIGS. 9 and 10 , the hairdryer  10  includes two sets of control buttons  62 ,  64 . A first set  62  is provided on the handle  20  and a second set  64  on the body  30 . Conveniently, the two sets of buttons  62 ,  64  are located so they can all be accessed by one digit. In normal use this digit is the thumb, but if the hairdryer is held differently it may be a finger. The first set  62  are provided on the handle  20  on the same side of the handle  20  as the body inlet  320 . The second set  64  are provided on the side wall  350  of the body  30 . An as example, the first set  62  can include an on button  62 An and a cold shot button  62   b  and the second set  64  can include a heater control button  64 An and a flow control button  64   b.    
     One advantage of having the buttons located on one side or end of the hairdryer is that all the control buttons  62 ,  64  can be seen by a user at the same time making use of the hairdryer and changes to parameters such as flow rate and temperature simplified. 
     Another advantage is that the control electronics are in one region of the handle  20 . This is particularly advantageous when the primary flow path  400  is through the handle as there is no wiring to be routed around the handle to the front face, i.e., that side of the handle  20  that faces the outlets  340 ,  440  of the hairdryer. 
     A third advantage is that the second set of control buttons  64  is mounted directly onto the PCB  75 . This not only simplifies the production of the hairdryer but also improves reliability as there are fewer electrical connections within the hairdryer. 
     The control buttons  62 ,  64  can be depressible buttons or slidable controls or a mixture of differently actuated controls. It is preferred that the control buttons  62 ,  64  stand proud of the surface in which they are located as this enables a user to find the required button by feel alone. 
     The PCB  75  will now be discussed in particular with reference to  FIGS. 3, 4   b ,  11   a ,  11   b ,  12   a ,  12   b , and  12   c . The PCB  75  is annular or ring shaped and extends around the duct  310  and between the duct  310  and the outer wall  360 . In this example, the PCB has two boards, a first board  75   a  which extends all the way round the duct  310  and a second board  75   b  adjacent of and downstream of the first board  75   a . The second board  75   b  extends only partially around the duct  310  and about the fluid flow path  300 . 
     The PCB  75  houses a number of different components each of which extend away from the board on which it is mounted by a different amount. Referring in particular to  FIGS. 3, 4   b ,  12   a ,  12   b , and  12   c , large components  77  such as capacitors, are positioned on the first board  75   a  radially away from the second board  75   b . This has a number of advantages such as the PCB  75  is made as compact as possible as the smaller components or those which extend least away from the board on which they are mounted are double stacked whereas the larger components or those that extend the furthest from the board on which they are mounted are single stacked. 
     Another advantage to this arrangement on the PCB  75  in is flow management of fluid in the primary fluid flow path  400  as the primary fluid flow path moves from the handle  20  into the body  30 . Referring to  FIGS. 3, 4   b    12   b , and  12   c , the handle  20  is generally tubular and the primary fluid flow path  400  is generally circular as it enters the junction  90  between the handle  20  and the body  30 . At this point the primary fluid flow path  400  changes direction by 90° and from a circular flow to an annular flow around the duct  310  between the duct  310  and the outer wall  360  of the body  30 . These changes affect the velocity of flow in the primary fluid flow path  400 . 
     If we consider that the body  30  is generally symmetrical about a centre line A-A which extends along the length of the body  30 , the duct  310  and outer wall  360  are concentric as is the heater  80  located between the duct  310  and the outer wall  360 . When the fluid in the primary fluid flow path  400  reaches the junction  90  between the body  30  and the handle  20 , the fluid must change both direction and shape. This creates a region of high velocity flow in the body  30  by the junction  90  and a region of lower velocity flow radially spaced within the body  30  from the junction  90 . If we consider the body  30  to have an upper half  380  and a lower half  390  where the upper half  380  is radially spaced away from the handle  20  and the lower half  390  includes the junction  90  between the body  30  and the handle  20  then the lower half  390  has flow at a relatively higher velocity than the upper half  380 . 
     The PCB  75  is orientated so that larger components  77  are located in the upper half  380  in the relative lower velocity flow radially away from the region of relatively high velocity so that their impact on the velocity of flow within the hairdryer is reduced. The double layer  75   a ,  75   b  PCB is located in the lower half  390  as this part of the PCB  75  extends less into the primary fluid flow path  400 . 
     In addition, a flow plate  700  is provided to curve or direct the flow within the primary fluid flow path  400  over and around the PCB  75  to further minimise any pressure losses due to the location of the PCB and due to the change of direction of the primary fluid flow path  400  as it enters the body  30 . The flow plate  700  is annular with a curved section  710  ( FIGS. 3, 4   b ,  11   a ,  11   b ,  12   a ,  12   b , and  12   c ) that provides a smooth change in orientation or direction for the primary fluid flow path  400 . By providing a curved surface  710  flow is directed around the corner reducing noise produced by the orthogonal change in direction and reducing any pressure loss or loss of velocity of the fluid. The entire flow plate  700  could be curved however, the benefits are seen by merely having the part of the flow plate  700  that is located in the lower half  390  of the body  30  having a curved surface  710 . 
     The flow plate  700  is adjacent the PCB  75  and advantageously, the flow plate  700  is connected to the PCB  75  via a connecting bridge  720 . The flow plate  700  is made from a conducting material preferably a metallic material such as aluminium or an alloy thereof so this bridge  720  provides a heat sink for the PCB  75  drawing heat from the components of the PCB and conducting that heat into the fluid flowing through the fluid flow path as it passes the flow plate  700 . 
     In addition, the flow plate  700  serves as a thermal bather for the PCB  75  and temperature sensitive components mounted thereon. A heater  80  is located within the body  30  downstream of the junction  90  between the body  30  and the handle  20  and the PCB  75  and when fluid is flowing through the primary fluid flow path  400 , i.e., when the hairdryer is switched on the majority if not all of the heat produced by the heater  80  will be taken to the primary fluid outlet  440 . However, when the hairdryer is turned off or onto stand-by, the heater will emit residual heat which will radiate both upstream and downstream so the flow plate ideally also acts as a thermal barrier for the PCB  75 . 
     The flow plate  700  does not seal the PCB  75  against fluid in the fluid flow path  400  rather it enables fluid to flow around the PCB  75  either through openings  730  (FIG.  4   b  in particular) between the flow plate  700  and the body  30  or slots  740  within the flow plate ( FIG. 12 a   ). 
     The flow plate  700  has another function. In the event of a failure of one or more components such as a capacitor on the PCB  75 , the flow plate  700  acts as a deflector plate which deflects any debris and/or electrolyte from a component failure back towards the side wall  350  and protects against the debris and/or electrolyte from entering the primary fluid flow path  400  where it would encounter the heater  80  and the primary fluid outlet  440 . 
       FIGS. 13 to 16  show various views of a hairdryer  10  having an attachment  600  for changing a parameter of fluid output from the hairdryer. The attachment  600  comprises a bung  610  and an outer wall  660 . Between the bung  610  and outer wall  660  an attachment fluid flow path  620  extends from an attachment fluid inlet  630  to an attachment fluid outlet  640 . At the upstream end  660   a  of the outer wall  660  a ring of magnetic material  662  is provided. The ring of magnetic material  662  is recessed into or embedded in an upstream face  664  of the upstream end  660   a  of the outer wall  660 . 
     The hairdryer  10  includes a number of magnets  364  radially spaced around an end wall  362  at the second end  34  of the hairdryer  10  ( FIGS. 3 and 4   a ). The end wall  362  extends radially inwards of the outer wall  360  of the body  30 . These magnets  364  couple with the ring of magnetic material  662  when the attachment  600  is attached to the hairdryer  10 . 
     Alternatively, the end wall  362  of the hairdryer  10  can include a ring of magnetic material and the attachment can include point magnets radially spaced around or another ring of magnetic material. Only one part of the magnetic connection needs to be magnetised, the other merely needs to be magnetically attracted to the magnetised part. 
     The use of a magnetic connection between the hairdryer and an attachment has a number of advantages, particularly when used with this type of hairdryer  10 , i.e., one having an inner bore  300  defined by a duct  310  and components  77 ,  80  which extend around the bore. The spacing and maintaining the spacing between the duct  310  and the outer wall  360  of the hairdryer  10  along the length of the body  30  is important. If the duct  310  were pushed to one side within the body  30 , the heater  80  could become damaged, fluid flow compromised and hot spots could appear on the outer wall  360 . 
     Thus, when an attachment is attached and removed, it is important not to introduce extra stress or strain on the hairdryer  10 . Traditional push and snap fit and friction fit methods of attachment could do this. However, magnetic attachment provides consistent positioning at a known force. In addition if the product is dropped or knocked the magnetic force attracting the two parts can be set at a level which allows the attachment to snap off. 
     The force between the magnets can be manipulated in a number of ways. The use of discrete or point magnets is one way. A ring of magnetic material is an alternative. This could be a solid ring of a magnetic material such as iron or could comprise flakes of magnetic material moulded within a suitable substrate such as an epoxy resin. The ring of material can be fully exposed, partially exposed or concealed behind the end wall of the hairdryer. Referring now to  FIGS. 17 a  and 17 b    two alternative constructions are discussed. Both options have the end wall  362  extending radially inwards of the outer wall  360  of the body.  FIG. 17 a    shows an L-shaped ring of magnetic material  700  having a first leg  710  which engages the inner surface  362   a  of the front face  362  of the outer wall and a second leg  720  which extends from the first leg  710  towards the outer surface of the end wall  362 . The second leg  720  may be flush with the outer surface.  FIG. 17 b    shows an alternate construction where the ring of magnetic material  730  is positioned against the inner surface  362   a  of the end wall  362  and is completely concealed behind the end wall  362 . 
     The ring of magnetic material  662  on the attachment  600  may also be fully exposed, partially concealed or fully concealed at the upstream face  664 . When partially or fully exposed magnetic parts are used, both parts of the magnetic attachment  700 ,  662  are preferably flush with the respective end wall  362  and upstream face  664 . Alternatively the two parts of the magnet are shaped to engage mechanically as well as magnetically. For example by the provision of one recessed magnet and one proud of the respective end wall and upstream face or a stepped surface to the magnets. 
     For the embodiments where the magnet is exposed, it is preferably covered in an anti scratch coating  722  ( FIG. 17 a   ) such as PTFE. This is advantageous as it allows for the attachment to be rotated with respect to the body of the appliance without damage to mating surfaces. 
     In the embodiments shown and referring to  FIGS. 13, 14   a  and  14   b  in particular, the attachment  600  is a concentrator nozzle, i.e., it concentrates the flow into a smaller area. The primary fluid flow path  400  of the hairdryer has an annular primary fluid outlet  440  and this provides a relatively large cross sectional area of heated fluid. The attachment  600  has an attachment fluid outlet  640  which is generally rectangular with its&#39; long side  670  being similar to the diameter of the primary fluid outlet  440  (it may be bigger or smaller) and the short side  680  being significantly smaller than the diameter of the primary fluid outlet  440  and the long side  670 . A concentrator nozzle  600  concentrates the flow over a smaller area providing a user with a directed flow. As the attachment  600  is rotatable with respect to the body  30  and can be positioned in any orientation with respect to the body  30 , the flow from the attachment can be orientated horizontally or vertically or at any angle inbetween enabling the user to have fine control over drying. 
     Referring to  FIGS. 13 to 16 , when the attachment  600  is attached to a hairdryer  10 , the outer wall  660  forms a continuation of the hairdryer outer wall  360 . The bung  610  has two parts a cone  612  and a base  614 . The cone  612  extends within the attachment  600  forming a point  616  towards the attachment fluid outlet  640  and directs flow from the primary fluid outlet  440  of the hairdryer towards the attachment fluid outlet  640 . The cone  612  defines with the outer wall  660  the limits of the attachment fluid flow path  620 . The base  614  is upstream of the cone  612  and limits flow from the fluid flow path  300  by extending into the end of the duct  310  forming a loose bung. The attachment fluid flow path  620  is in fluid communication with the primary fluid flow path  400  of the hairdryer  10  so fluid from the primary fluid flow path  400  is emitted from the attachment fluid outlet  640 . 
     The invention has been described in detail with respect to a hairdryer and a hot styling brush however, it is applicable to any appliance that draws in a fluid and directs the outflow of that fluid from the appliance. 
     The appliance can be used with or without a heater; the action of the outflow of fluid at high velocity has a drying effect. 
     The attachment described has been a concentrating attachment however, magnetic attachment of any nozzle shape, size or with any function is possible. 
     The fluid that flows through the appliance is generally air, but may be a different combination of gases or gas and can include additives to improve performance of the appliance or the impact the appliance has on an object the output is directed at for example, hair and the styling of that hair. 
     The invention is not limited to the detailed description given above. Variations will be apparent to the person skilled in the art.