Filter element (11) formed by a rectangular frame (25) that is tightly connected to the side edges (26) and to the end edges (22) of a folded filter material, with at least one fold (21) located in at least one of the two ends (25) and which is introduced in a termination (23) that constitutes a part of the frame (25), characterized in that the termination (23) consists of two parts in which it is attached and the two parts are connected between yes, so that the termination together with the side parts (24) forms a frame (25), and the side parts (24) are adhered to the zigzag-shaped side edge (26) of the filter material (20) and, of the In the same way, the connection of the termination (23) with the lateral parts (24) is carried out to form the frame (25).
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