Miele DGC 6500 Operating And Installation Instructions page 163

Appliance and building-in dimensions
Ventilation cut-outs
To ensure the appliance has adequate ventilation, the following cut-outs
measuring 500 x 40 mm must be provided:
a in the top of the housing unit
b in the interim shelf above the building-in niche
The furniture housing unit must not have a back panel fitted behind the building-in
niche.
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