Main parts

Vallox 125A R model is shown in the figure. In the L model, the parts are mirrored.

2a
Heat recovery cell
3a
Extract air fan
3c
Supply air fan
4a
Fine filter for supply air
4b
Coarse filter for supply air
4c
Coarse filter for extract air
5a
Bypass damper of the HR cell
6a
Post-heating resistor
6b
Additional heating resistor
7a
Safety switch
9a
Ceiling bushing for electric wires
10a
10b
Control panel
11a
Internal humidity sensor
11a
Internal carbon dioxide sensor
11c
Carbon dioxide sensor (Optional)
11d
Humidity sensor (Optional)
11e
VOC sensor (Optional)