An air-conditioning unit comprising: a housing including at least one air inlet for receiving air and at least one air outlet for discharging cool air; an adjustable vane for directing the discharged cool air, the adjustable vane being detachably and pivotally mounted to the housing by interengagement of a plurality of key lugs and corresponding key slots provided at or adjacent a first end, a second end, and a third point between the first end and the second end; a motor detachably coupled to the adjustable vane for controlling the opening angle of the adjustable vane relative to the housing; a first key lug for operable engagement within a corresponding first key slot, one of the first key lug and first key slot being provided on the adjustable vane, the other being provided on the housing; at least a second key lug for operable engagement within at least a second key slot, one of the second key lug and second key slot being provided on the adjustable vane, the other being provided on the housing; and a third key lug for operable engagement within a third key slot, one of the third key lug and third key slot being provided on the adjustable vane, the other being provided on the housing; wherein the disengagement of the third key lug from the third key slot at the third point allows the adjustable vane to be flexed sufficiently to allow engagement/disengagement of the other key lugs (24a, 24b) and corresponding key slots (20a, 20b), wherein the disengagement position of the first key lug from the corresponding first key slot is at an opening angle of the adjustable vane which is different to the opening angle of the adjustable vane for the disengagement position of the at least second key lug from the corresponding at least second key slot. a housing including at least one air inlet for receiving air and at least one air outlet for discharging cool air; an adjustable vane for directing the discharged cool air, the adjustable vane being detachably and pivotally mounted to the housing by interengagement of a plurality of key lugs and corresponding key slots provided at or adjacent a first end, a second end, and a third point between the first end and the second end; a motor detachably coupled to the adjustable vane for controlling the opening angle of the adjustable vane relative to the housing; a first key lug for operable engagement within a corresponding first key slot, one of the first key lug and first key slot being provided on the adjustable vane, the other being provided on the housing; at least a second key lug for operable engagement within at least a second key slot, one of the second key lug and second key slot being provided on the adjustable vane, the other being provided on the housing; and a third key lug for operable engagement within a third key slot, one of the third key lug and third key slot being provided on the adjustable vane, the other being provided on the housing; wherein the disengagement of the third key lug from the third key slot at the third point allows the adjustable vane to be flexed sufficiently to allow engagement/disengagement of the other key lugs (24a, 24b) and corresponding key slots (20a, 20b), wherein the disengagement position of the first key lug from the corresponding first key slot is at an opening angle of the adjustable vane which is different to the opening angle of the adjustable vane for the disengagement position of the at least second key lug from the corresponding at least second key slot.