2 Pack Replacement Filters for Envirovent energiSava 200 & 250 Dimensions: 193mm x 233mm 2 Pack Replacement Air Filters suitable for: Envirovent energiSava 200 MVHR System Envirovent energiSava 250 MVHR System Envirovent Filter Product Codes: FILTER-ES200 FILTER-ES250 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 have been developed by FilterMate and are in no way approved by or associated with Envirovent.