| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger having reduced ventilation resistance and in creased hat exchange efficiency. SOLUTION: The heat exchanger 11 consists of heat transfer tubes 12 and fins 13 through which the heat transfer tubes 12 are inserted and having fin collars 14, concerning a fin collar part where the heat transfer tube 12 is not inserted, the fin collar 14 is crushed while bringing it down outward, thus, the heat exchanger excellent in heat exchange efficiency is easily manufactured.
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