Patent ID: 7482557

Claim:
A radiator element for use in an air heating device, comprising: at least one lamella element comprising a plurality of lamellae arranged in a meander-like manner; and a radiator sheet having a bottom, two opposing lateral sides, a first end, and second end, the first and second ends each extending substantially perpendicular to the bottom and defining a lamella end marking, the lamella end markings defining a length of the lamella element, wherein said radiator sheet comprises projections extending from the two opposing lateral sides and completely extending between the first end and the second end for the purpose of attaching said lamella element to said radiator sheet prior to assembly of the air heating device, wherein each of the projections has a first length along the respective lateral side and a second length in a vertical direction, and wherein the first length is a multiple of the second length, wherein each of said projections comprises a groove extending between the first end and the second end, the groove defining a first portion of the projection and a second portion of the projection, the second portion configured to fold at the groove by more than 90° in a single direction with respect to the first portion, the second portion deforming when pressed into the lamella element.