Nefit MVHR filters
When selecting a MVHR filter, it is important to choose one that fits your system. With us you can always see for which ventilation systems each filter is suitable. It is also smart to always compare the dimensions of the filters with the dimensions of your current filters.
Slip case or wash cloth model?
There are two filters available for the Nefit Optifor MVHR: one in a slipcover model and one in a washcover model. But which one do you need? If your Nefit Optifor unit was issued after week 41 of 2001, you need the slipcover model. If your Nefit Optifor unit was issued before week 41 of 2001, you will need the wash cloth model.
Volume discount on Nefit WTW-filters
Do you want to order more than one piece? We offer an extra high quantity discount on the individual filters and filter sets, making the filters even more affordable. When ordering 2 pieces, you will already receive a 5% discount, when ordering 10 pieces, this will even increase to 10%! If you are looking for even larger quantities, we will be happy to make you a personal offer.
New regulation for MVHR filters: ISO16890
Since August 2018, the filter standard has changed. The quality of the filters is no longer indicated with G3, M5 or F7 but with the new ISO16890 standard. With this new standard, the quality of MVHR filters can be indicated much better and this also provides more clarity for the customer. In the new regulations, the following values per filter are indicated:
- ISO Coarse - percentage of coarse dust retained by the filter.
- ISO ePM1 - percentage of fine dust ( < 1 µm ) retained by the filter.
- ISO ePM2,5 - percentage of fine dust ( < 2,5 µm ) retained by the filter.
- ISO ePM10 - percentage of fine dust ( < 10 µm ) retained by the filter.
Compare old and new standard MVHR filters
With MVHR filters, the old regulations are still often used and therefore it is useful to be able to compare these standards. In the table below we have compared the terms in order to give a better idea of the different filter classes. Please note: This is an estimate and the values may vary slightly.
|Filter class||ISO Coarse||ISO ePM10||ISO ePM2,5||ISO ePM1|
|G3||> 45 %||-||-||-|
|G4||> 90 %||-||-||-|
|M5||> 95 %||> 50 %||-||-|
|M6||> 95 %||> 60 %||50 - 60 %||-|
|F7||> 95 %||> 85 %||65 - 80 %||50 - 65 %|
|F8||> 95 %||> 90 %||> 80 %||65 - 80 %|
|F9||> 95 %||> 95 %||> 95 %||> 80 %|