Apparatus for lighting, heating, refrigerating and/or sanitary purposes; kitchen apparatus in this class; food and/or drink storage, display and/or service apparatus in this class; refrigerators including refrigerators for storage and/or display; coolroom apparatus including coolroom inserts; parts and fittings for refrigerators, coolroom apparatus and insulated storage spaces including doors, windows, panels (including glass panels and metal panels), shelving and frames