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AEG — putting words into action. 3 4 General The cooker hood can be used : either as an exhaust air appliance (extraction mode) or as a return air appliance (recirculation mode) - filtering through an active carbon filter (optional extra). Notes prior to installation in the extraction mode the exhaust air must not be introduced into a smoke flue or exhaust gas chimney. Introduction of the exhaust air into a shaft used for ventilation of the installation spaces of firerooms is not permitt