Abstract: An electric far-infrared heater has a plate-like porous metallic panel formed by an electroforming process installed in a box-like housing over an electric heating element therein. The panel is heated by the element and has its outer surface covered by a porous ceramic far-infrared emitting layer of Al.sub.2 O.sub.3, TiO.sub.2, Cr.sub.2 O.sub.3, MgO, ZrO.sub.2, SiO.sub.2 or mixtures thereof. A stream of gas supplied to the interior of the housing is heated by the element and passes through the porous panel and far-infrared layer for discharge onto the object being heated.

Abstract: A truck trailer or similar bulk storage area is heated by providing electrical resistance heaters in longitudinally-extending metal ducts extending from and to a short distance below the floor level. Electrical sheet resistance heaters are attached to the underside of the metal plate forming the duct top, each duct is placed between a longitudinally-extending pair of wooden floor boards, and a pair of ducts are placed side-by-side near each edge of the trailer bed or floor of the storage area.

Abstract: An infrared electric panel heater includes an open side covered by a sintered or electroformed porous metallic panel. An electric sheathed heating element is installed in the housing in contact with the inner surface of the porous panel. The outer surface of the porous panel is substantially entirely covered with a ceramic layer, selected from the group consisting of Al.sub.2 O.sub.3, TiO.sub.2, Cr.sub.2 O.sub.3, Mg O, ZrO.sub.2, SiO.sub.2 and mixture thereof, which emits far-infrared rays when heated.

Abstract: A radiant heating panel is formed using a foam insulation core surrounded by a reinforcing mesh and having a pair of wiring harness fixtures snapped over each end of the reinforced core. A radiant heating wire is strung back and fourth between the fixtures to provide a radiant heating element and the core structure, including the radiant heating element, is then wrapped in a paper wrapper which is secured to the core through the reinforcing layer on the side of the core opposite the heating element. A cementicious thermal insulating layer is applied to encase the heating element and the paper wrapper is wrapped into overlying relationship with the cementicious layer to substantially completely enclose the core.

Abstract: This invention relates to a device for air-conditioning premises, with exchange of heat energy by low temperature infrared radiation, comprising a flat element for exchanging heat energy by low temperature infrared radiation, extending parallel to a wall of the room, at a distance therefrom, wherein it comprises, between the heat exchanger element and the wall, an element reflecting the low temperature infrared radiation and, towards the interior of this room, a sheet stretched across the room, made of a material behaving in diathermic manner with respect to the low temperature infrared radiation, the heat exchanger element, the element reflecting the radiation and the sheet being hooked, along their edges, to walls of the room.

Abstract: An electrically heated sauna oven comprising a housing, a number of stone elements, particularly soap rock elements, and electric resistor elements, and the electric power supplied therein is controlled by means of a control unit. The stone elements are slabs mutually alike slabs of a regular shape, which are adjacently attached to the housing. The housing is formed of a plate-like underlay, which is vertically attached to the sauna wall. The electric resistor elements are fitted inside each stone element.

Abstract: A ceramic heating plate which comprises a planar body including a ceramic substratum covered with a far-infrared ceramic layer on the top surface; a heating sheet attached to the back surface of the substratum, the heating sheet including a pair of lead terminals through which the heating plate is connected to a source of power; and wherein the ceramic layer contains a single layer of ceramic particles exposed above the surface thereof so that far-infrared rays are radiated outside directly therefrom.

Abstract: An infrared panel heater includes a housing having a gas inlet and a gas discharge opening covered by a porous metal panel. An electric heating element is disposed in the housing between the panel and the gas inlet for heating the panel for emission of infrared radiation therefrom. A plurality of spaced, parallel gas stream distributor plates are disposed in the housing between the heating element and gas inlet and are each provided with a plurality of openings forming the sole flow path for gas from the inlet to the discharge opening. The openings in each plate are uniform in diameter with the diameter of the openings in the respective plates decreasing as the plate is situated closer to the heating element so that a uniform gas distribution is achieved across the entire panel area. The outer surface of the panel may be coated with a porous ceramic infrared emitting layer.

Abstract: Individual electrically heated mats, self-regulated by use of an electrical element whose resistance varies proportionately with its temperature, used for covering walking areas to prevent accumulation of snow and ice. Each mat is provided with male and female electrical connections on the ends of short power cords to permit any number of mats to be chained together in electrical parallel and to be used to cover, for example, a flight of stairs by positioning one mat on each stair.