Do ventilation filters protect you from colds and flu? The truth about indoor air quality
During winter, when the air is dry and rooms are aired less often, colds and the flu become regular visitors. ❄️🤧 Naturally, the question arises – can ventilation filters protect you from viruses? 💨
The short answer: ❌ No. Viruses are so tiny (around 0.1 micrometre) that even high-grade EPM1 or F7 filters can’t trap them directly. ⚙️ However, a well-adjusted ventilation system that maintains good air circulation 💨 and uses clean filters can significantly improve indoor air quality and reduce the spread of infections. ✅
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But here’s where the real point lies. 💡 Viruses don’t travel on their own – they attach to tiny droplets released when we sneeze or cough, usually between 1–10 micrometres in size. 🤧💨
And here’s the key difference: these droplets form indoors, not from the outside air. 🏠 Their removal doesn’t depend on the filter itself – it’s the ventilation system that works to extract them together with the used air. 🔁🌬️
At the same time, ventilation filters play another important role – they protect your home from outdoor air pollution such as dust, pollen and fine particles. 🌫️🌿 These pollutants can irritate your airways and weaken your immune system, so clean filtered air = a healthier indoor environment and a lower risk of catching a cold. ✅
1️⃣ The filter doesn’t stop viruses – it supports healthier air 💨
A ventilation filter can’t catch viruses themselves, but it helps create the conditions where your body can better resist infections. 💪🦠 A clogged or low-grade filter allows fine particles to enter your home, irritating the airways and making you more vulnerable to colds and allergies. 🤧 Cleaner air means fewer irritants, fewer flare-ups and less frequent illness.
🔧 Use at least an EPM1 70 % or F7 class filter – these are most effective at capturing fine dust and pollen. 🌿 If your ventilation system operates in a city area or near busy roads, it’s worth using activated carbon filters during the heating season to help absorb traffic pollutants. 🚗🏙️
💡 Practical tip: replace your filters at least two to three times per year – and more often if you live in a dusty environment. ⏳✅
Zehnder ComfoAir Q 350/450/600 F7+G4 Filter set (Efficient)
Ex VAT: £13.08
| Manufacturer of MVHR | Zehnder |
| Manufacturer | CleanFilter |
| Air handling unit |
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| Filter dimensions | 500x159x22 |
| Class EN779 | F7+G4 |
| Class ISO16890 | ePM1 65% |
| 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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Brink Flair 325/400 1xF7 Filter (Smog&Pollen)
Ex VAT: £17.43
| Manufacturer of MVHR | Brink |
| Manufacturer | CleanFilter |
| Air handling unit |
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| Filter dimensions | 245x510x22 |
| 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 |
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| Manufacturer product number |
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| Remarks | Supply air filter. Extract air filtration requires an additional G4/M5 filter, available in our shop. |
Domekt R 450 V F7+M5 C6 Filter set (Efficient)
Ex VAT: £21.17
| Manufacturer of MVHR | Komfovent |
| Manufacturer | CleanFilter |
| Air handling unit | Domekt R 450 V (Rego 450 VE) |
| Filter dimensions | 470x240x46 |
| 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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| Remarks |
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SAVE VTR 300 (Premium, BF) F7+G4 Filter set (Efficient)
Ex VAT: £14.08
| Manufacturer of MVHR | Systemair |
| Manufacturer | CleanFilter |
| Air handling unit | SAVE VTR 300 |
| Filter dimensions |
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| Class EN779 | F7+G4 |
| Class ISO16890 | ePM1 60% |
| 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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Blauberg KOMFORT EC D5 180 F7 Filter (Smog&Pollen)
Ex VAT: £7.35
| Manufacturer of MVHR | Blauberg |
| Manufacturer | CleanFilter |
| Air handling unit |
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| Filter dimensions | 214x186x48 |
| 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 |
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| Remarks |
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Oxygen X-Air C180,C200,C250 / Easy C150,C200,C250 F7+M5 Filter set...
Ex VAT: £14.22
| Manufacturer of MVHR | Oxygen |
| Manufacturer | CleanFilter |
| Air handling unit |
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| Filter dimensions | 205x205x46 |
| 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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| Remarks |
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VALLOX 096 MC/SE/MV / VALLOPLUS 270 MV/SE/SC F7+2xG4 Filter set...
Ex VAT: £10.27
| Manufacturer of MVHR | VALLOX |
| Manufacturer | CleanFilter |
| Air handling unit |
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| Filter dimensions |
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| Class EN779 | F7+2xG4 |
| Class ISO16890 | ePM1 70% |
| Protection level | High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. |
| Quantity of filters | 3 |
| Advantages |
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| Manufacturer product number | 3356900 |
2️⃣ Why fine particles are linked to colds and flu 🌫️🤧
Fine particles such as PM10, PM2.5 and PM1 are small enough to reach deep into your airways. 💨 They irritate the nose and throat, weakening the natural barrier that protects you from infections, making it easier for viruses to spread. 🦠 When the air is polluted, colds and flu can last longer and feel more severe. 😷
📊 The EPA (Environmental Protection Agency) highlights that even moderate levels of fine particles in the air can affect respiratory health. These particles – dust, smoke, pollen and smog – circulate indoors and weaken the immune system over time. 🌁
✅ That’s why effective air filtration is not only about comfort – it’s about protecting your health. The cleaner the air, the less irritation and the better you’ll feel throughout the season. 💚
3️⃣ The importance of ventilation – how air circulation removes airborne particles 💨🦠
When we sneeze or talk, tiny aerosol particles are released into the air and can stay suspended for minutes or even hours, especially when there isn’t enough air circulation. 😷 A well-adjusted ventilation system continuously refreshes the air – removing stale, humid air filled with aerosols and supplying fresh filtered air. 🔁 This is one of the most effective ways to reduce the spread of airborne viruses indoors. ✅
🔧 Check your ventilation settings:
- 👥 When there are more people in the room (for example, during gatherings or visits), increase the airflow rate.
- ⏳ After a few hours, the indoor air becomes cleaner and fresher again.
- ❄️ In winter, when we spend more time indoors, keep the air exchange running continuously – it helps maintain a healthy indoor climate. 💚
🌬️ Continuous air movement helps remove airborne “carriers” – sneeze droplets, dust and aerosols – making your home air safer and healthier to breathe. 💨✅
4️⃣ Relative humidity – your natural protection against colds 💧🤧
Air that’s too dry (when humidity drops below 30 %) can irritate your airways and allow viruses to remain active for longer. When the mucous membranes dry out, your body finds it harder to defend itself against infections. ❌ Studies show that keeping humidity between 40–60 % helps maintain healthy airways and reduces the risk of illness. ✅
💡 How to maintain the right humidity level:
- 🔄 If your system uses a standard heat exchanger, it tends to dry the air during winter.
- 🌿 A better solution is upgrading to an enthalpy or sorption heat exchanger, which helps retain both heat and moisture.
- 💧 If that’s not an option, use a humidifier or an additional air humidification system to balance indoor moisture levels.
🌬️ Balanced humidity together with proper air circulation ensures a healthier indoor climate – less irritation, more comfort and easier breathing all winter long. 💚
🧭 Summary
While ventilation filters don’t directly capture viruses, good air circulation and clean filtered air play a vital role in protecting your health. 💨 A balanced indoor climate reduces irritation, supports your body’s natural defences and helps you stay healthy during the cold season. 💪🦠
- ✅ Use EPM1 or F7 class filters
- ⚙️ Maintain your ventilation settings
- ⏳ Replace your filters regularly
- 💧 Keep humidity between 40–60 %
🌿 The result – clean, fresh air, fewer colds and greater comfort every day. 💚
🌟 Why choose CleanFilter?
- ✅ Proven quality. All our filters are tested according to the ISO 16890 standard and deliver top performance – F7 class with ePM1 70 % efficiency. Some brands claim compliance but do not provide verified results or independent testing. 🧪
- 🔒 Perfectly sealed design. The filter media is fully bonded across the entire frame, ensuring that air with pollutants cannot leak through the joints – a common issue in lower-quality filters. 💨
- 🧼 Hygienic and safe choice. Our filter material meets the VDI 6022 hygiene standard, meaning no growth of microorganisms or mould – keeping your indoor air clean and healthy. 🌿
🔗 Find the right filter for your ventilation system here 👉 cleanfilter.co.uk