Abstract: An infrared heater, especially for construction purposes or for animal brooders in which the air duct passes through the reflector on the side of a glow body turned away from the surface to be irradiated so that the air duct is heated by the glow body. Within the heated region of the air duct, a filter is provided which is heated to red heat, thereby pyralizing or burning off deposits and maintaining the filter free from obstruction for long periods.

Abstract: A process is described for manufacturing a carbon particle filter having a plurality of channels which extend in the exhaust gas flow direction and which are alternatingly sealed at the upstream and downstream end of a porous ceramic material. To minimize the time required for producing the channels, a slip-like ceramic starting material is applied to a fabric having longitudinal threads corresponding to the size location and position of the channels and extending at least in the longitudinal direction of the filter. The carbon filter body is then formed by layering the coated fabric and thereafter in the course of the ceramic firing of the carbon filter body, its inlet and outlet channels are formed by burning away the longitudinal threads.