Main parts
| No. | Part | No. | Part |
|---|---|---|---|
| 2a | Heat recovery cell | 6b | Additional heating resistor |
| 3a | Extract air fan | 7a | Safety switch |
| 3c | Supply air fan | 9a | Ceiling bushing for electric wires |
| 4a | Fine filter for supply air | 10a | Control panel |
| 4b | Coarse filter for supply air | 11a | Internal carbon dioxide and humidity sensor |
| 4c | Coarse filter for extract air | 11c | Carbon dioxide sensor (optional) |
| 5a | Bypass damper of the HR cell | 11d | Humidity sensor (optional) |
| 6a | Post-heating resistor | 11e | VOC sensor (optional) |