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| material | specification | fin OD | heat exchanging area per meter | height of fin | thickness of fin | distance betwween fin |
| steel | ø18X2.0 | ø38 | 0.62 | 10 | 0.3 | 4 |
| steel | ø21X2.0 | ø51 | 0.75 | 15 | 0.3 | 5 |
| steel | ø21X2.5 | ø45 | 0.87 | 12 | 0.3 | 5 |
| steel | ø25x2.5 | ø50 | 1 | 12.5 | 0.3 | 5 |
| steel | ø25x2.5 | ø55 | 1.25 | 15 | 0.3 | 5 |
steel fin tube circled with steel fin