CDA CHA 17 Cooker Hood Charcoal Filters 

Fitting Instructions

Changing the charcoal filter (re-circulating only)
To ensure best performance of your extractor, you should replace the charcoal filter every four to six months, depending on use.
To attach a new charcoal filter, first remove the grease filters as described above.
Insert the charcoal filter into the guide on the side of the motor, then slide the filter in until it locks into place.
Repeat with the second filter on the opposite side.
Finally replace the grease filters.