Bertazzoni KMC30X Instructions D'installation page 21

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Attach each charcoal filter to the black grid on each side of
the blower. Press the charcoal filter tightly to the black grid
on the blower side and rotate the filter clockwise (towards
the front of the hood) until it locks into place.
Turn counterclockwise (towards the back of the hood) to
remove.
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Replace the filters one at a time, supporting them with one hand and turning the safety knobs (pull
and turn). Do not discard the filters and set aside for future use.
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