Abstract: An insulated structure including a backing surface, a bar coupled to and extending generally parallel to the backing surface, and a plurality of insulating blankets coupled to the bar. The insulated structure further includes a clip coupled to the bar, the clip being attachable to the bar at any of a plurality of locations along the length of the bar to compress at least one of the blankets.

Abstract: A replaceable heater cover including a frame that is shaped to be removably coupled to an outer surface of a heater and an insulating material coupled to the frame. The insulating material is shaped to receive a vessel thereon during heating of the vessel, the insulating material including an opening for allowing hot gases to pass therethrough to heat a vessel that is located on the insulating material.

Abstract: A guillotine-style door closure system for a furnace comprises a furnace opening with a door frame on a vertical side of the furnace; a furnace door adapted to mate with the frame; a left closing chain mounted, at one end, to the vertical side of the furnace approximate the left jamb and the lintel of the frame, and mounted, at its other end, to a left pin extending from the furnace door approximate the left vertical side of the door, below the vertical centerline of the door and distal from the rear vertical side of the door; and a right closing chain mounted, at one end, to the vertical side of the furnace approximate the right jamb and lintel of the frame, and mounted, at its other end, to a right pin extending from the furnace door approximate the right vertical side, below the vertical centerline and distal from the rear vertical side of the door.

Abstract: In a refrigerator comprising a cabinet, means to refrigerate contents of a chamber within the cabinet, a door for access to such chamber, a fan to circulate air within such chamber, and a switch operable with the door to a first mode wherein the switch enables the fan when the door is closed and to a second mode wherein the switch disables the fan when the door is opened, a relay having contacts arranged to be closed after a delay of preset duration from energization of the relay and to be opened upon deenergization of the relay is connected so as to be energized in the second mode of said switch, so as to be deenergized in the first mode of the switch, and so as to enable the fan when the contacts are closed. A lamp indicates that the contacts are closed.