R model in the figure. In the L model, the parts are mirrored.
Extract air fan (behind the protective cover)
Supply air fan (behind the extract air duct)
Fine filter for supply air
Heat recovery cell
Bypass flap
Coarse filter for supply air
Coarse filter for extract air
Post-heating radiator (behind the extract air duct)
Safety switch
Control panel
Carbon dioxide sensor
Humidity sensor
Internal humidity sensor