Whilst this is a photo copy, and some of the pages are a little askew, it was all readable and intact. A real bonus finding an old manual for a classic piece of kit that no other site had.
It was easy done, and I got exactly what I was looking for.
Text excerpt from page 13 (click to view)
The charcoal filter must be changed at least every 4 months. The charcoal filter cannot be washed or regenerated. The hood can only work well in the recirculating mode if the AEG recommended filter has been used, the filter is changed as recommended in this section and if the hood is cleaned and maintained as instructed in this booklet. Therefore follow the instructions closely for best performance. The charcoal filter deals with odours which are created during cooking. Pull the two plastic stops B as shown by the arrows (fig. 5) and remove the metal filter. New charcoal filters are available from AEG or your retailer; it must not be washed. To remove rotate the filter in anticlockwise (Fig. 3). Re-fit the metal filter
Failure to observe the rules for cleaning the appliance and changing and cleaning the filters may cause fires. Therefore, we recommend you follow these instructions carefully.