ePM1 Filter Class: Key Features and When to Choose It
Since 2018, air filters have been classified under the ISO 16890 standard based on their efficiency in capturing specific particle sizes. This ensures filters are tested and rated according to their real-world performance.
Filters in the ePM1 class must capture at least 50% of PM1 particles (0.3–1 μm) during testing. For example, a filter rated as ePM1 70% captures more than 70% of PM1 particles. The term ePM stands for Efficiency of Particulate Matter.
These filters effectively remove fine solid particles, ensuring healthier indoor air. They are the most efficient filters in the ISO 16890 classification.
Why Choose an ePM1 Filter?
ePM1 filters are commonly used in supply air systems because:
- They meet stringent hygiene requirements, even in polluted areas.
- They trap allergens like pollen, dust, and other fine particles.
However, ePM1 filters are denser, which leads to:
- Higher air resistance, potentially increasing energy consumption.
- A shorter lifespan compared to Coarse or ePM10 filters.
What Does an ePM1 Filter Capture?
ePM1 filters are designed to trap:
- Fine dust.
- Allergens (e.g., pollen)
- Mold spores
- Pesticide particles
- Combustion byproducts
- Smog particles
Higher-efficiency filters (e.g., ePM1 85%) can even capture most bacteria.
Where Are ePM1 Filters Typically Used?
ePM1 filters are versatile and commonly used in:
- Standard supply air filters in air handling units (AHUs) from brands like Flexit, Systemair, and Zehnder.
- Additional supply air filters in MVHR systems with three-filter setups (e.g., Brofer, Blauberg), where a G4 pre-filter extends the lifespan of the F7 filter.
- Exhaust air filters in some units (e.g., Flexit, Ensy). However, this is generally unnecessary since it doesn't affect indoor air quality.
Manufacturers like Komfovent, Salda, and Paul often provide ePM1 filters as secondary or replacement options, with ePM1 50% to 70% filters being the most commonly used. Higher-efficiency filters (ePM1 85%) are typically reserved for highly polluted environments.
When Should You Choose an ePM1 Filter?
Consider an ePM1 filter (e.g., F7) if outdoor air quality is a concern, especially in these cases:
- Someone in your household has allergies, asthma, or other respiratory conditions.
- You live near busy roads or in an urban area.
- Your area uses solid fuels for heating or experiences occasional smog.
If outdoor air quality is good, an ePM1 filter may not be necessary. Its higher airflow resistance can shorten filter life and increase noise from your air handling unit.
ePM1 Filters and the EN 779 Standard
Under the EN 779 standard, ePM1 filters align with F7, F8, and F9 classifications based on their efficiency levels.
Why Choose CleanFilter ePM1 Filters?
CleanFilter’s ePM1 filters stand out for their quality and performance:
Premium Material: Made with 3-layer SANDLER AG material that:
- Meets German hygiene standard VDI 6022.
- Provides high dust-holding capacity and extended service life.
- Achieves top ePM1 70% efficiency in its class.
- Is free from harmful PFAS chemicals.
Verified Quality: Factory and third-party tests ensure that:
- The filters perform as promised.
- They feature an airtight design.
- They comply with all current standards.
