The F7 sock filter DIY installation pack is for inlets up to 200mm. The pack includes the “Ventsure” replacement filter, ties for securing the new filter and easy to follow DIY instructions.
This filter is made from internationally rated F6 filter material. With the upgraded filtration a much larger surface area is required in order to let the air pass through the filter, because of this our filter is much larger and uses a cylindrical design to maximise surface area. A smaller surface area will reduce airflow and increase fan noise, this will then cause a reduction in the life of your fan motor.
The filter should be replaced every 12 months.