heiu00dfluftofen, equipped with a kreuzstrom tubes heat exchanger, complete at least two series (734, 834) a variety of wu00e4rmetauscherru00f6hren (333 433 533 633, 733, 833), characterizedthe wu00e4rmetauscherru00f6hren in each series in an essentially horizontal plane are arranged in a row and in a predetermined relationship wu00e4rmetauscherru00f6hren ordered in relation to the wu00e4rmetauscherru00f6hren in an adjacent row, and each heat auscherru00f6hre an elongated pipe (333) with a ru00f6hrenwand (361) iswhile the interior of the elongated tube with at least one lengthwise of inner wall (363, 363 '') is equipped, which from one side of the inner surface of the elongated tube in the direction of a side of the inner cover.
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