Suitable for the Kair Kalahari ECO range. Not Suitable for the original Kair Kalahari (Pre-2021) model. Kair Kalahari ECO filters should be replaced every 3 to 5 years. If you notice that your Kair Kalahari ECO is not performing as effectively as when first installed - Condensation or mould reoccurring, this is an indication that the filters could be blocked or restricted.