Suitable for Nuaire Flatmaster & Flatmaster 2000L & Flatmaster 2000R For all models after 2001 Genuine Nuaire replacement filter. G3 Rated filter Flatmaster filters should be replaced every 1 to 2 years. If your unit is near a main road / high pollen area you may want to change more often If you notice that your Flatmaster is not performing as effectively as when first installed - Condensation or mould reoccuring, this is an indication that the filters could be blocked or restricted.Therefore the unit supply of fresh replacement is reduced and will become less effective - Service your unit and replace the filter. Dimensions: 250x250x100mmWeight: 0.3kg