A pair of Vent Axia Sentinel Kinetic High Flow (MVHR) Replacement Filters These compatible Vent Axia Sentinel Kinetic replacement filters are manufactured to a high standard in the UK. Regularly replacing the filters and maintaining your Vent Axia MVHR unit will reduce the humidity in your house, completely removing condensation dampness and preventing mould growth. Regularly replacing the filters will help create a healthy living environment by removing airborne pollutants from your home, these include coarse dust, insects, hair, spores, house dust, skin flakes, pet dander, and pollen. Keeping your machine well-maintained with clean filters will also make it more energy-efficient which can help reduce your electricity bill and usage. Vent-Axia part numbers 403702 - 444201 - 443351 1 set includes 2 pieces wire frame filters G4 Graded. Format Filters approx 185mm x 510 mm mm (L x W) These filters are manufactured in the UK, as replacement filters. They are in no way associated with the MVHR air system manufacturer. The use of manufacturer names is solely for the purposes of identifying the correct filters.