Last reviewed: by the MVHR Expert engineering team
We supply and fit the right filters for your unit and check airflow afterwards, so you know the new filters are seated properly and nothing is bypassing them.
What we do on a filter visit
- Identify the correct filter grade and size for your unit
- Replace supply and extract filters (and any pre-filters)
- Check seals and filter seating to prevent bypass
- Reset the filter timer or warning indicator
- Quick airflow check to confirm the system is moving air
How it works
- Tell us your unit. Send a photo of the unit label and we'll confirm the correct filters.
- Fit. Old filters out, new filters in, seals checked.
- Reset & test. Timer reset and airflow confirmed.
How often should MVHR filters be changed?
Most manufacturers recommend replacing filters every 6 to 12 months and checking them every 3 to 6 months. Homes by busy London roads, with pets, or close to building works can clog filters in under 6 months.
What are G4 and F7 filters?
Filter grades describe how fine the filter is. G4 is a coarse filter that protects the unit from dust and fluff, usually on the extract side. F7 is a finer filter that captures pollen and fine particulates, commonly used on the supply side. Your unit may use different grades, so always check before ordering.
Can I wash and reuse MVHR filters?
Most MVHR filters are disposable and are not designed to be washed; cleaning them damages the filter media and reduces performance. Only reuse a filter if the manufacturer specifies it as washable for that model.