Miele S 8990 UniQ Operating manual - Page 27
When to change the exhaust filter? 27, Always replace the Active Air Clean
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When to change the exhaust filter? Depending on the model, your vacuum cleaner will use one of the following standard exhaust filters: a Air Clean Change the exhaust filter each time you open a new box of Miele filter bags. A new Air Clean exhaust filter is included in every box of Miele filter bags. b Active Air Clean SF-AAC 50 (black) c Active HEPA SF-AH 50 (blue) Always replace the Active Air Clean b or Active HEPA c filter if the indicator and the reset button light (after approximately 50 hours of operation, which is equivalent to one year of average use). Once the indicator light comes on, you can still continue to use the vacuum cleaner. However, the filter performance and suction power will be reduced. Instead of the Active Air Clean b or Active HEPA c exhaust filter installed as standard, an Air Clean a exhaust filter can also be used (see section "Maintenance and care - Exchanging exhaust filters"). Maintenance and care 27