Dimensions: 193mm x 233mm. 2 Pack Replacement Air Filters suitable for Envirovent energiSava 200 & 250 MVHR System Envirovent Filter Product Code: FILTER-ES200, FILTER-ES250 The thickness of our filter media is 40mm in total. This means you get at least twice the amount of filtration compared with our competitors, assuming they use the same high grade G4 (with an arrestance of approx 90%) material Our filters can be removed and washed unlike our competitors filters which can only be vacuumed. This makes them last longer and provides better filtration We supply frameless filters which work with your existing frames, resulting in less waste sent to landfill We pass on the savings from having a leaner supply chain to our customers, which means we can supply G4 grade filters for a similar price our competitors supply lower grade G3 filters