Abstract: In a multi-pane window structure for use between a cold region and a warmer region, where the first pane adjoining the warmer region is electrically heated to prevent condensation or frost, the improvement comprising an infrared-reflective coating transparent to visible light applied to the second pane from the warmer area on the surface thereof facing the warmer region.

Abstract: A rotatable heating unit for supporting food receptacles is convertible to a rotatable unheated unit, and comprises a base, and a circular support rotatably mounted on said base, having a depressed central surface. Means are provided for heating said depressed central surface and thereby heating food receptacles supported thereon. A removable cover substantially fills the depressed central portion of said support to form with the surrounding portion of said support a substantially level unheated surface for supporting food receptacles. Means are provided for spacing said cover from said depressed central surface.

Abstract: A cabinet that maintains heated food at a constant temperature by circulating heated air including means for controlling moisture in the circulating air. A top mounted blower forces the heated air through a louvered panel over pans of food; the louvers are graduated to assure even distribution of air. A water reservoir is employed which includes baffling to prevent water from being spilled when the reservoir is moved, the baffling also permits control over the amount of moisture absorbed by the circulating air.