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In winter, outdoor air becomes very dry once it is heated indoors, and mechanical ventilation often reduces indoor relative humidity to 20–30 RH or even lower. This article explains why this happens, how different heat exchanger types (plate, condensation rotor, enthalpy, sorption) affect indoor moisture balance, and what you can do in practice. We cover smart ventilation control during cold nights, protection against excessive drying, when a humidifier is really needed, and simple ways to increase or reduce humidity naturally. You will also find an FAQ with common real-life situations and climate-specific recommendations for different countries.
Cold outdoor air and warm, humid extract air can create condensation that may freeze inside the heat exchanger. Learn what “defrost” does, why airflow balance matters, and how to reduce frequent frost cycles.
Not all ventilation unit filters are the same. Some ensure clean, healthy indoor air, while cheaper or uncertified filters can pose risks to both the ventilation system and your health. This guide explains what to look for when choosing filters — from ISO 16890 testing and hygiene standards to material safety and real filtration performance — so you can be confident you’re using a safe, certified and reliable filter.
Filters suitable for Weber ventilation units – Premium 250, 350, 500 and ECO/Standard 300, 400.
G4 filters capture coarse dust and larger particles.
F7 filters remove fine dust, pollen, and allergens.
Made to original dimensions for perfect fit and clean airflow in your Weber system.
There are 5 products.
Ex VAT: £11.68
| Manufacturer of MVHR | Weber |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 670x170 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 65% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages |
|
Ex VAT: £11.86
| Manufacturer of MVHR | Weber |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 770x170 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 65% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages |
|
Ex VAT: £10.09
| Manufacturer of MVHR | Weber |
| Manufacturer | CleanFilter |
| Air handling unit | Weber req 650 Premium |
| Filter dimensions | 375x175x40 |
| Class EN779 | F7 |
| Class ISO16890 | ePM1 70% |
| Protection level | High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. |
| Quantity of filters | 1 |
| Advantages |
|
Ex VAT: £12.06
| Manufacturer of MVHR | Weber |
| Manufacturer | CleanFilter |
| Air handling unit | Weber req 650 Premium |
| Filter dimensions | 765x250 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 65% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages |
|
Ex VAT: £6.61
| Manufacturer of MVHR | Weber |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 466x170 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 65% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages |
|
