Hand held appliance

A hairdryer comprising a body and a handle, the body comprising:

• an inner external wall delimiting a first fluid flow path, the inner external wall extending through the body from a first fluid inlet for admitting fluid into the hairdryer to a first fluid outlet for emitting fluid from the hairdryer,
• an outer external wall,
• a primary fluid flow path extending through the hairdryer from a second fluid inlet to a second fluid outlet, wherein a section of the primary flow path extends through a heater and the section of the primary fluid flow path that extends through the heater is at least partially defined by an inner internal wall that extends around an outer periphery of the inner external wall and an outer internal wall that extends within an inner periphery of the outer external wall,
• a fan located in the primary fluid flow path,
• an inner fluid chamber at least partially defined by both the inner external wall and the inner internal wall, the inner fluid chamber being configured to provide a thermally insulating barrier between the heater and the inner external wall, and
• an outer fluid chamber at least partially defined by both the outer external wall and the outer internal wall, the chamber being configured to provide a thermally insulating barrier between the heater and the outer external wall.