A method for configuring an open display refrigerator, wherein the open display refrigerator comprises a refrigerated storage space and at least one shelf (206a-e) in the interior of the open display refrigerator, air in the refrigerated storage space being separated from air exterior to the open display refrigerator by an air curtain established by a fan which blows air towards an air outlet, air in the air curtain being recovered by an air inlet which recirculates the air from the air curtain into an air duct coupled to the air outlet and wherein the method comprises: a) providing an array of temperature sensors within the interior of the open display refrigerator; b) measuring an initial temperature difference between the warmest temperature recorded by the array of temperature sensors and the coldest temperature recorded by the array of temperature sensors; c) coupling an air guide to an edge of the at least one shelf (206a-e), said edge being the one distal to a rear wall of the refrigerated storage space, at a start point; d) adjusting the distance between the air guide and the edge of the shelf for the at least one shelf (206a-e); e) measuring a final temperature difference associated with the distance, the final temperature difference being the temperature difference between the warmest temperature recorded by the array of temperature sensors and the coldest temperature recorded by the array of temperatures sensors after coupling an air guide to the at least one shelf (206a-e); f) repeating steps (d) and (e) for a plurality of distances at discrete intervals; g) selecting a distance from the plurality of distances that gives rise to at least a threshold temperature difference between the initial temperature difference and the associated final temperature difference, or selecting the distance from the plurality of distances wherein the difference between the initial temperature difference and the associated final temperature difference is greatest. a) providing an array of temperature sensors within the interior of the open display refrigerator; b) measuring an initial temperature difference between the warmest temperature recorded by the array of temperature sensors and the coldest temperature recorded by the array of temperature sensors; c) coupling an air guide to an edge of the at least one shelf (206a-e), said edge being the one distal to a rear wall of the refrigerated storage space, at a start point; d) adjusting the distance between the air guide and the edge of the shelf for the at least one shelf (206a-e); e) measuring a final temperature difference associated with the distance, the final temperature difference being the temperature difference between the warmest temperature recorded by the array of temperature sensors and the coldest temperature recorded by the array of temperatures sensors after coupling an air guide to the at least one shelf (206a-e); f) repeating steps (d) and (e) for a plurality of distances at discrete intervals; g) selecting a distance from the plurality of distances that gives rise to at least a threshold temperature difference between the initial temperature difference and the associated final temperature difference, or selecting the distance from the plurality of distances wherein the difference between the initial temperature difference and the associated final temperature difference is greatest.