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During the colder months, the performance of a heat recovery ventilation unit depends strongly on the type of heat exchanger used. Rotary exchangers usually operate more continuously, but the supply air may feel cooler, meaning additional heating is sometimes needed for comfort. Plate heat exchangers, on the other hand, may switch to protective modes more quickly in low outdoor temperatures, and without a preheater, stable ventilation can become limited. In this article, we explain real-life scenarios: when reducing airflow makes sense, why filters clog faster in winter, and how to lower energy consumption while maintaining a healthy indoor climate.
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.
There are 22 products.
Ex VAT: £9.46
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit | Pichler LG 180 |
| Filter dimensions | 230x200x46 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 75% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages |
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Ex VAT: £16.99
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit | Pichler LG 250 |
| Filter dimensions | 460x200x46 |
| Class EN779 | F7+G4 |
| Class ISO16890 | ePM1 70% |
| Protection level | High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. |
| Quantity of filters | 2 |
| Advantages |
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| Manufacturer product number |
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Ex VAT: £12.64
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit | Pichler LG 250 |
| Filter dimensions | 460x200x46 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 75% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages |
|
| Manufacturer product number |
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Ex VAT: £22.35
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit |
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| Filter dimensions | 498x175x48 |
| Class EN779 | F7+F7 |
| Class ISO16890 | ePM1 70% |
| Protection level | High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. |
| Quantity of filters | 2 |
| Advantages |
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| Manufacturer product number |
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Ex VAT: £16.74
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 498x175x48 |
| Class EN779 | F7+G4 |
| Class ISO16890 | ePM1 70% |
| Protection level | High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. |
| Quantity of filters | 2 |
| Advantages |
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| Manufacturer product number |
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Ex VAT: £21.46
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit |
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| Filter dimensions | 498x175x48 |
| Class EN779 | F7/AC |
| Class ISO16890 | ePM1 70% |
| Protection level | Particles and odors: fine particles, dust, pollen, mold spores, combustion particles, volatile particles, NOx, O3 gases. |
| Quantity of filters | 1 |
| Advantages |
|
Ex VAT: £12.52
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 498x175x48 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 75% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages |
|
| Manufacturer product number |
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Ex VAT: £17.00
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit | Pichler LG 500 |
| Filter dimensions |
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| Class EN779 | F7+M5 |
| Class ISO16890 | ePM1 60% |
| Protection level | High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. |
| Quantity of filters | 2 |
| Advantages |
|
Ex VAT: £18.96
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit | Pichler LG 740 |
| Filter dimensions |
|
| Class EN779 | F7+G4 |
| Class ISO16890 | ePM1 70% |
| Protection level | High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. |
| Quantity of filters | 2 |
| Advantages |
|
Ex VAT: £24.14
| Manufacturer of MVHR | Pichler |
| Manufacturer | CleanFilter |
| Air handling unit | Pichler PKOM4 |
| Filter dimensions |
|
| Class EN779 | F7+M5 |
| Class ISO16890 | ePM1 70% |
| Protection level | High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. |
| Quantity of filters | 2 |
| Advantages |
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| Manufacturer product number |
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