Bosch HUI50351UC Manuel D'installation page 12

Preparing the units
Fitted units must be heat-resistant up to 194° F (90 °C).
The stability of the fitted unit must also be ensured after
the cut-out work.
After the cutting out work is complete, remove the
shavings.
Make the cut-out in the fitted unit.
1.
Make the cut-out for the exhaust air duct.
2.
Exhaust air opening above the fitted unit:
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Exhaust air opening behind the fitted unit: