KECF189 Replacement Carbon (or "Activated Charcoal") Filter to suit Kleenmaid Rangehood Models RHSOTF60, RHSOTF90, RHSOR60, RHSOG61 & RHSOG91 installed in recirculating mode i.e. not vented outdoors. There is 1 charcoal filter located inside 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 this filter is approximately six months, however always replace the filter when it no longer absorbs odours effectively.