2 Pack Replacement Filters for Nuaire MRXBOX95-WM2 (Now known as MRXBOX-ECO2) Dimensions: 194mm x 347mm 2 Pack Replacement Air Filters suitable for: Nuaire WM2 MVHR system Nuaire ECO2 MVHR system Suitable for Nuaire Product Codes: MRXBOX95-WM2 MRXBOX95AB-WM2 MRXBOX-ECO2 MRXBOXAB-ECO2 If you're not 100% sure which filters you need, we recommend you check the dimensions of your filters against the product description before placing your order.  Filters must be changed a minimum of every 12 months but this is subject to the environment in which you live. Filters being used in urban areas will need more regular changing, often every 3 to 6 months. Basic filter maintenance is recommended between filter changes. This can be undertaken by cleaning gently or vacuuming the filters. We recommend that you read your manufacturer instructions for detailed cleaning instructions. Typically you should avoid using any liquids when cleaning. Our filters are "own brand" filters of FilterMate and are in no way approved by or associated with Nuaire or any of its affiliate companies and brands. The use of the Nuaire and system names and codes are solely used for the identification of which air filtration units the FilterMate own brand filters are intended to be used with.