A hand held appliance including a wall, a fluid flow path extending within the wall from a fluid inlet into the appliance to a fluid outlet from the appliance, a fan unit extending longitudinally within the wall for drawing fluid into the fluid inlet wherein the fan unit is non-concentric with respect to the wall. The fan unit may be positioned coaxially within the fluid flow path. The wall has a thickness and the thickness of the wall may varies. The wall may be generally tubular and the thickness of the wall varies around a circumference of the wall. The wall may be generally tubular and has an inner surface and an outer surface. A central axis of the inner surface may be different to a central axis of the outer surface.