KECF189 (1 only Carbon Filter to suit Rangehood models RHSOTF60, RHSOTF90, RHSOR60, RHSOG61 and RHSOG91). The internal Kleenmaid Activated Charcoal (or “Carbon”) Filter is used on a rangehood installed in recirculating mode i.e. not vented outdoors. There is 1 charcoal filter located inside each of these rangehood models, which removes cooking odours from the air. It cannot be cleaned and will require replacement. The effective life of the filter depends on the type and amount of cooking you do. Generally the life of the filter is approximately six months, however always replace the filter when it no longer absorbs odours effectively.