| 摘要 |
The invention relates to a heat exchanger ( 10 ) for an air heating apparatus ( 12 ) for integration into a housing which guides air. The heat exchanger has a heat exchanger body ( 14 ) with a longitudinal axis. According to the invention, the heat exchanger body ( 14 ) has on its external surface (external side) a plurality of undular ribs ( 28 ) which extend essentially along its circumferential dimension, which ribs provide heat transfer surfaces.
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