Door construction for vertical refrigerator and freezer spaces

A vertical door structure and upright cabinet structure with refrigerator and freezer cold spaces of the kind normally used in everyday commodity stores to display goods on sale, said upright cabinet structure having a cooling system with forced cooling air circulation within and through the cold space, and having a vertical doorway, and means pivotally mounting said door structure on said cabinet structure on a vertical axis so the door structure is adapted to close said doorway;

• said door structure comprising two glass panes which, together with a frame which embraces the edges of the glass panes, at least partially form a vertical door leaf, wherein the glass panes of said door comprise solely two parallel, spaced apart glass panes, a first of said parallel glass panes having two surfaces and facing towards the warm atmosphere of a shop area when the door is installed on said cabinet structure, a heat generating electrically conductive coating provided on the surface of said first pane which will be remote from the shop area and being effective to heat said first glass pane electrically;
• and the second of said two parallel glass panes, having two surfaces and facing towards the colder refrigerator or freezer space when the door is installed on said cabinet structure and is closed, an infrared radiation reflective material coating provided on the surface of said second pane facing towards said colder space, said infrared radiation reflective material coating constituting the sole surface material on the surface of said second glass pane facing the colder space and which said sole surface material provides a radiation exchange with an emissivity factor, to the colder space, which is less than 0.2.