Coarse Filter Class: Key Features and Benefits

Since 2018, air filters have been classified under the ISO 16890 standard, which rates their efficiency in capturing specific particle sizes. This system ensures that filters are tested and rated based on real-world performance, helping users make informed decisions.

What Are Coarse Filters?

Coarse filters capture less than 50% of PM10 particles (0.3–10 μm) during testing. Their efficiency is measured by their ability to handle particulate matter (PM). For instance, a filter rated as Coarse 75% captures over 75% of coarse particles. These filters effectively remove larger contaminants, promoting healthier indoor air while maintaining low energy consumption in ventilation systems.

Why Choose a Coarse Filter?

Coarse filters are a popular choice because they provide:

• Lower airflow resistance: Compared to higher-efficiency filters (ePM10, ePM2.5, or ePM1), Coarse filters reduce the energy needed to run your ventilation system.

• Extended lifespan: They are less prone to clogging, ensuring longer usage between replacements.

• Quieter operation: The lower resistance allows the ventilation system to work more silently.

What Do Coarse Filters Capture?

Coarse filters are effective at trapping:

• Medium-sized dust particles

• Sand

• Insects

• Lint

• Larger pollen particles

They ensure sufficient filtration to keep ventilation systems clean and efficient, protecting them from wear and tear.

Common Uses for Coarse Filters

Coarse filters are widely used in ventilation systems due to their low resistance and reliable performance. For example, G4 filters (a common Coarse class) are often found in:

1. Exhaust Air Filtration: Used in air handling units (e.g., Brink, Vallox, Zehnder) to protect heat exchangers from clogging.

2. Dust Protection in Air Ducts: Installed in extract air valves to prevent dust accumulation in ducts.

3. Pre-Filters in Ventilation Systems: Capture the majority of contaminants, extending the lifespan of higher-grade filters like ePM1. These can be placed in separate filter boxes or directly in the unit.

4. Main Supply Air Filters: Ideal for low-pollution areas where air quality is good, providing long-lasting filtration without increasing energy use.

When to Choose a Coarse Filter for Supply Air Filtration

A Coarse filter is an excellent option if:

• No one in your household suffers from hay fever or asthma.

• Your home is in a low-pollution area, away from busy roads or industrial zones.

• You live in a suburban or rural area with minimal use of solid fuels for heating.

• There is no regular smog in your vicinity.

Coarse Filters and the EN779 Standard

Under the older EN779 standard, Coarse filters correspond to G2, G3, and G4 filter classes. Some lower-efficiency M5 filters may also qualify as Coarse filters if they do not meet the ePM10 efficiency criteria.

Why Choose CleanFilter Coarse Filters?

CleanFilter Coarse filters are engineered for exceptional performance and durability:

Premium Material: Made with SANDLER AG material that:

• Meets German hygiene standard VDI 6022.

• Offers high dust-holding capacity for extended service life.

• Is free from harmful PFAS chemicals.

Verified Quality:

• Factory and third-party testing ensure reliable performance.

• Airtight design guarantees a secure fit.

• Complies with all current standards for safety and efficiency.

Choose CleanFilter Coarse filters for cleaner air, quieter operation, and long-lasting performance.