Refrigerated display appliances

A refrigerated display unit, comprising:

• an open-fronted cabinet containing a product display space accessible through an access opening defined by the open front;
• a cooling means for introducing or producing cold air to refrigerate items in the product display space in use;
• at least one forwardly-positioned discharge outlet communicating with a supply duct for, in use, projecting cold air with a discharge velocity as an air curtain across the access opening, which discharge outlet has an effective width that determines air curtain thickness;
• and
• at least one forwardly-positioned return inlet communicating with a return duct for, in use, receiving air from the air curtain, such that spacing between the discharge outlet and the return inlet determines air curtain height;
• wherein the discharge velocity, as measured at a point 25 mm below the discharge outlet, is between 0.1 m/s and 1.5 m/s;
• air curtain height is less than ten times the air curtain thickness;
• and
• the air curtain is substantially unsupported by any supplementary cooling airflow supplied into the product display space separately from the air curtain.