A pack of carbon filters for selected electriQ Cooker HoodsCarbon filters remove unwanted odours from the air when you\'re cookingYou will only need these if your cooker hood is not venting through an external wall and you are recirculating the airCarbon filters need changing every 6 months to maintain their performancePlease check below for the list of compatible cooker hoods Carbon filter for electriQ Chimney Hood. This carbon filter is compatible with . eiQCHDD90. .