Siemens NXAIR Operating Instructions Manual page 45

Ventilation flap in the high-voltage door in operational position
If the position indicator shows that the ventilation flap in the high-voltage door is not in operational position,
bring the ventilation flap into operational position as described in the following.
Procedure
Open the high-voltage door.
Move the ventilation flap (1) on the inside of the high-voltage door from the center of the
lower edge upwards away from the high-voltage door until the mechanism of the position
indicator (2) reaches the end stop (3).
Fig. 54: Inside view of high-voltage door
Now the mechanism holds the ventilation flap in this position by itself.
Close the high-voltage door.
✓
The ventilation flap in the high-voltage door is in operational position.
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Operating the circuit-breaker panel
NXAIR / ≤ 40 kA
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