F7 Filter Class: Key Features and When to Choose It
Filters are classified by how well they trap particles, and F7 filters fall into the "fine filtration" category. These filters capture small particles (0.3-1 μm) to help maintain good indoor air quality, even in highly polluted areas.
Why Choose an F7 Filter?
F7 filters are commonly used as supply air filters in air handling units because:
- They clean the air to meet hygiene standards, even in polluted environments.
- They trap allergenic particles like pollen and dust.
However, F7 filters are denser, meaning they have higher air resistance. As a result, they may have a shorter lifespan compared to G4 or M5 filters and can increase energy usage.
What Does an F7 Filter Capture?
F7 filters typically capture:
- 92-99% of PM10 particles (like dust, pollen and mold spores)
- 65-80% of PM2.5 particles (like combustion particles)
- Up to 60% of PM1 particles (like smog)
These filters are effective against fine dust, allergens, mold spores, pesticide dust, and pollution particles.
Where Are F7 Filters Typically Used?
F7 filters are commonly used in:
- Standard supply air filters in many air handling units (AHUs) like Flexit, Systemair, and Zehnder.
- Additional supply air filters in MVHR systems with 3-filter setups (e.g., Brofer, Blauberg). In this case, a G4 filter pre-filters the air, extending the F7 filter’s lifespan.
- Exhaust air filters in some units (e.g., Flexit, Ensy), though this is generally unnecessary since it doesn’t impact indoor air quality.
Many AHU manufacturers offer F7 filters as secondary or replacement filters, such as Komfovent, Salda, and Paul.
When Should You Choose an F7 Filter?
Choose an F7 filter if outdoor air quality is a concern. It's recommended if:
- You or someone in your home has pollen allergies.
- Anyone has asthma or respiratory conditions.
- You live near busy roads.
- You live in an urban area.
- Your area uses solid fuels for heating, or there is occasional smog.
If outdoor air quality is good, an F7 filter may be unnecessary. It creates more airflow resistance and may lead to shorter filter life and increased noise from the air handling unit.
F7 Filters and the ISO 16890 Standard
According to the ISO 16890 standard, F7 filters correspond to a range of filters with ePM2.5 60% to ePM1 60% efficiency.
Why Choose CleanFilter F7 Filters?
They’re made with 3-layer SANDLER AG material that:
- Meets German hygiene standard VDI 6022.
- Offers high dust capacity and long service life.
- Achieves top ePM1 70% efficiency in its class.
- Is free from harmful PFAS chemicals.
Quality is assured by factory and third-party tests, ensuring:
- The filter performs as promised.
- It has an airtight design.
- It complies with current standards.
