On this page, you will find all WTW filters for the Bergschenhoek R-Vent WHR 91 WTW systems. It is important to regularly check the filters of your heat recovery system and replace them if necessary. With dirty filters, the air quality in your home deteriorates significantly, and your ventilation system will not function properly. Therefore, quickly choose a filter set that fits your unit type and ensure good air quality is maintained!
Since August 2018, the filter standard has changed. The quality of the filters is no longer indicated by G3, M5, or F7 but by the new ISO16890 standard. This new standard allows for a much better indication of the quality of WTW filters, providing more clarity for the customer. The new regulations specify the following values per filter:
In WTW filters, the old regulations are still often used, so it is useful to compare these standards. In the table below, we have placed the terms side by side to provide a better understanding of the different filter classes. 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 % |
Item number: 38011000
Item number: 38011001
