Main parts
R model in the figure. In the L model, the parts are mirrored.
| No. | Part | No. | Part |
|---|---|---|---|
| 2a |  Heat recovery cell | 6d |  Post-heating liquid radiator (245 CFi VKL)
|
| 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 (in front of the supply air fan) | 11e |  VOC sensor (optional)
|