September checklist: keep your home’s air fresh
September is a transitional month when sharp temperature and humidity fluctuations put extra strain on your heat recovery ventilation system. During the day the air remains warm, while nights are much cooler. If the ventilation is not properly adjusted, it can lead to discomfort, condensation, or even the risk of mold
Over the summer, ventilation unit filters often become clogged with pollen, tree fluff, insects, and dust. This reduces airflow and worsens indoor air quality. September is the perfect time to take care of your filters so you can enter the heating season with clean, steady air in your home.
Key things to check in September
✅ Bypass check
Summer mode is over, which means heat recovery through the exchanger becomes essential. Make sure you haven’t left the bypass switched on manually — otherwise, cold outdoor air will enter your rooms directly, bypassing the heat exchanger.
✅ Supply air heating
In autumn, days are no longer as warm, which means that in the evening, at night, or in the morning, the supply air may feel too cool. Switch on the supply air heater – it will help maintain a comfortable indoor temperature without extra load on the main heating system. The downside is slightly higher electricity consumption, but comfort will be ensured.
✅Filter contamination
Over the summer, filters accumulate organic particles such as insects, fluff, and pollen. As the weather cools and humidity rises, these can become a breeding ground for mold and bacteria, often causing unpleasant odors. If you notice such signs, replace the filters.
✅ Outdoor smoke pollution
In autumn, neighbors start firing up their boilers. Smoke odor and fine particles (ePM2.5, ePM1) can enter your home. In this case, it’s recommended to use at least an F7 class filter. If smoke is a major issue, choose a carbon filter.
👉 September is the time when we spend more hours indoors. Take care of healthy air in your home with CleanFilter.
Zehnder ComfoAir Q 350/450/600 1xF7/AC Activated carbon filter (Odor)
Ex VAT: £13.83
| Manufacturer of MVHR | Zehnder |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 500x159x22 |
| Class EN779 | F7/AC |
| Class ISO16890 | ePM2.5 60% |
| Protection level | Particles and odors: fine particles, dust, pollen, mold spores, combustion particles, volatile particles, NOx, O3 gases. |
| Quantity of filters | 1 |
| Advantages |
|
| Remarks | ⚠️ Remarks: ComfoAir ≠ ComfoAir Q. Different dimensions, not interchangeable. Check your ventilation unit model/version before ordering. |
RECOM 4SR 1xF7/AC Activated carbon filter (Odor)
Ex VAT: £17.81
| Manufacturer of MVHR | RECOM |
| Manufacturer | CleanFilter |
| Air handling unit | RECOM 4SR |
| Filter dimensions | 436x196x40 |
| Class EN779 | F7/AC |
| Class ISO16890 | ePM2.5 60% |
| Protection level | Particles and odors: fine particles, dust, pollen, mold spores, combustion particles, volatile particles, NOx, O3 gases. |
| Quantity of filters | 1 |
| Advantages |
|
Paul Climos 200 1xF7/AC Activated carbon filter (Odor)
Ex VAT: £8.08
| Manufacturer of MVHR | Paul |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 168x174x45 |
| Class EN779 | F7/AC |
| Class ISO16890 | ePM2.5 60% |
| Protection level | Particles and odors: fine particles, dust, pollen, mold spores, combustion particles, volatile particles, NOx, O3 gases. |
| Quantity of filters | 1 |
| Advantages |
|
Domekt R 300 V 1xF7/AC Activated carbon filter (Odor)
Ex VAT: £14.31
| Manufacturer of MVHR | Komfovent |
| Manufacturer | CleanFilter |
| Air handling unit | Domekt R 300 V |
| Filter dimensions | 290x205x46 |
| 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 |
|
| Remarks | 🌟 High-quality replacement filter: made from certified materials (Germany, SANDLER AG) with tested performance. Provides reliable air filtration and optimal service life. |
Brink Renovent Excellent 300/400/450 1xF7/AC Activated carbon...
Ex VAT: £18.99
| Manufacturer of MVHR | Brink |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 185x525x25 |
| Class EN779 | F7/AC |
| Class ISO16890 | ePM2.5 60% |
| Protection level | Particles and odors: fine particles, dust, pollen, mold spores, combustion particles, volatile particles, NOx, O3 gases. |
| Quantity of filters | 1 |
| Advantages |
|
| Manufacturer product number | 532227 |
ENSY AHU 350/400 1xF7/AC Activated carbon filter (Odor)
Ex VAT: £20.19
| Manufacturer of MVHR | ENSY |
| Manufacturer | CleanFilter |
| Air handling unit |
|
| Filter dimensions | 165x370x94 |
| 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 |
|
| Manufacturer product number | 1460-862 |