| 摘要 |
A fin (1) is provided with: a region (L) in which a heat transfer facilitation part (3) is not provided; and a region, other than region (L), in which the heat transfer facilitation part (3) is provided. The region (L) is a region between a lower end part of a heat transfer tube (2A) and an upper end part of a heat transfer tube (2B). |
