Miele KWT 6321 UG Operating And Installation Instructions page 41

Before installation, ensure the building-in niche is the correct size. The specified
ventilation cross-sections must be adhered to and the cut-out in the plinth
facing for the ventilation grille supplied must be aligned centrally with the
appliance in order to ensure the correct functioning of the appliance.
The ventilation grille and foam block supplied must be fitted and used
together.
Installation advice
41