An open refrigerated display case comprising: a refrigerated display area comprising one or more shelves; an air outlet and an air inlet opening into the display area and spaced from one another; a duct fluidically coupling the air inlet to the air outlet, the duct being configured to direct air flow out of the air outlet across the display area and toward the air inlet to form an air curtain across the display area; wherein each of the one or more shelves are provided with an associated flow stabilising device; wherein each flow stabilising device comprises a pair of stabilising beams (38a, 38b) which are spaced from one another so as to define an innermost stabilising beam and an outermost stabilising beam; wherein a first slot is formed between the innermost and the outermost stabilising beams, the first slot extending transversely across the display area perpendicular to the direction of the air flow within the air curtain, the first slot having a stabilising inlet, a stabilising outlet and a stabilising throat disposed therebetween; and wherein the one or more flow stabilising devices are each positioned so that the stabilising inlet of the first slot receives a portion of the air curtain from said air outlet, the stabilising throat being configured to stabilise the air flow within the air curtain which exits the flow stabilising device via the stabilising outlet; and characterized in that the innermost stabilising beam is spaced from the adjacent shelf so as to form a second slot between the innermost stabilising beam and the shelf through which another portion of the air curtain from said air outlet can pass. a refrigerated display area comprising one or more shelves; an air outlet and an air inlet opening into the display area and spaced from one another; a duct fluidically coupling the air inlet to the air outlet, the duct being configured to direct air flow out of the air outlet across the display area and toward the air inlet to form an air curtain across the display area; wherein each of the one or more shelves are provided with an associated flow stabilising device; wherein each flow stabilising device comprises a pair of stabilising beams (38a, 38b) which are spaced from one another so as to define an innermost stabilising beam and an outermost stabilising beam; wherein a first slot is formed between the innermost and the outermost stabilising beams, the first slot extending transversely across the display area perpendicular to the direction of the air flow within the air curtain, the first slot having a stabilising inlet, a stabilising outlet and a stabilising throat disposed therebetween; and wherein the one or more flow stabilising devices are each positioned so that the stabilising inlet of the first slot receives a portion of the air curtain from said air outlet, the stabilising throat being configured to stabilise the air flow within the air curtain which exits the flow stabilising device via the stabilising outlet; and characterized in that the innermost stabilising beam is spaced from the adjacent shelf so as to form a second slot between the innermost stabilising beam and the shelf through which another portion of the air curtain from said air outlet can pass.