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Blue ventilation fans with interchangeable adapters, made of heat-resistant plastic.
| Building size | Diameter | Height |
| BG 71 | 122 mm | 26 mm |
| BG 80 | 132 mm | 26 mm |
| BG 90 | 167 mm | 33 mm |
| BG 100 | 171 mm | 37 mm |
| BG 112 | 216 mm | 46 mm |
| BG 132 | 246 mm | 56 mm |
| BG 160 | 298 mm | 56 mm |
| BG 180 | 333 mm | 56 mm |
| Adapter for build size | Diameters | Min/Max diameter (pilot) |
| BG 71 / 80 | pilot, 14, 16, 19, 20, 22 | 3 – 23 mm |
| BG 90 / 100 | pilot, 24, 25, 30 | 17 – 35 mm |
| BG 112 / 132 | pilot, 28, 30, 32, 40, 45 | 20 – 48 mm |
| BG 160 / 180 | pilot, 42, 45, 50 | 29 – 55 mm |
Actual specifications may differ from those stated on this website. No rights can be derived from the specifications stated on this website.