The frame is made of steel profiles. It is used for connecting two ventilation ducts/fittings with one another. For ducts or fittings with a side length of 1000 mm or less, a P20 profile is used. For ducts or fittings with a side length of 1000 mm or more, a P30 profile is used.
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| A (mm) | B (mm) |
| 200 | 200 |
| 300 | 300 |
| 400 | 400 |
| 500 | 500 |
| 600 | 600 |
| 700 | 700 |
| 800 | 800 |
| 1000 | 1000 |
| 2000 | 2000 |
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