Vallox 51 MV / 51K MV filters

Vallox systems use a three-filter setup to ensure optimal air quality and protect the system. Our replacement filter set includes two G4 filters and one F7 filter.

One G4 filter captures coarse particles from the extracted indoor air, protecting the system from dust and debris buildup. The second G4 acts as a pre-filter on the supply side, trapping larger particles such as insects and debris before they reach the main F7 filter. The F7 filter performs the greatest filtration function, capturing finer particles such as dust, pollen, and allergens, thereby improving indoor air quality.

This combination helps extend the system’s lifespan and maintain efficient performance.

No. Each ValloPlus size takes its own filter set: ValloPlus 270 uses set No. 27, ValloPlus 350 No. 22/24, ValloPlus 510 No. 28 and ValloPlus 850 No. 29. Match by the model name on your unit's label.

Vallox's digital controllers estimate saturation from one or two signals:

• Running hours
• On some models, pressure across the filter

It's a useful prompt, but a quick visual and airflow check is still worth doing, particularly in the first year of a new installation.

Most Vallox filter sets are three-piece G4+G4+F7 sets: two coarse G4 filters that protect the heat exchanger, plus a fine F7 (ePM1) filter for the supply air. Some older ILMAVA models use different combinations, such as G1+G1+G4 or G4+M5+F7, so match your set by model or by the Vallox filter set number.

We stock filter sets for Vallox's residential range — ValloPlus 270, 350, 510 and 850, numbered Vallox models such as 096, 110, 145 and 245 MV, Digit, TSK Multi and older ILMAVA units — widely installed across Finland and the wider Nordic market. The model name is printed on the unit's label.

Vallox groups its filters into numbered sets — for example, set No. 27 fits the Vallox 096 and ValloPlus 270, and set No. 28 fits the Vallox 145 and ValloPlus 510. Our product titles include the set number next to the model names, so if you know your set number you can match it directly. If not, find the model name on the unit's label and search by that.

Because most Vallox units use a three-stage arrangement rather than the two-filter layout common to other brands: two G4 filters that catch coarser particles on the extract and supply sides, and one F7 filter that handles fine dust and pollen on the supply side. All three should be replaced at the same time. A clogged G4 pre-filter restricts air flow just as much as a saturated F7, and leaving an old pre-filter in front of a new fine filter means the new filter is working behind a restriction from day one. That is why we sell Vallox filters as complete sets matched to the model rather than individually.