Air Filter Efficiency Standard for Pre and Medium Filter

#EN779 Developed to standardize air filter classification, ensuring consistent and reliable filter performance. Provided a clear framework for evaluating filters, which is crucial for the air filtration industry.

Testing Methods
Procedures: Methods measure initial and final pressure drop and include a dust loading test with synthetic dust.
Measurements: Evaluate filters based on maintaining efficiency over time under specific conditions.

Classification System
Filter Classes: Filters classified from G1 to F9.
G1-G4: Based on average captures (coarse particle removal).
F5-F9: Based on average efficiency (finer particle removal).
Application Significance: Each class has specific applications, from basic dust removal to precise particle filtration.

Limitations
Criticisms: Did not account for real-world particle size distribution and environmental conditions.
Transition to ISO 16890: The industry shifted to ISO 16890 due to these limitations.

#ISO16890 Introduced to address EN 779's shortcomings. Provides a more accurate representation of filter performance in real-world conditions.

Testing Methods
Procedures: Evaluate filters based on efficiency in removing particulate matter (PM1, PM2.5, and PM10).
Measurements: Uses a test aerosol to determine initial and conditioned efficiency, reflecting realistic performance.

Classification System
Filter Classes: Classified into ePM1, ePM2.5, and ePM10.
ePM1: Efficiency in removing particles ≤1 micron.
ePM2.5: Efficiency in removing particles ≤2.5 microns.
ePM10: Efficiency in removing particles ≤10 microns.
Application Significance: Helps in selecting filters based on specific air quality needs.

Advantages
Enhanced Relevance: Aligns better with real-world air quality conditions, providing a more practical assessment of filter performance.
Global Standards: Supports global air quality standards, easing compliance with international regulations.

Conclusion
Understanding the key differences between EN 779 and ISO 16890 is crucial for selecting appropriate air filtration products. ISO 16890 offers a more accurate and globally relevant standard, ensuring better air quality and regulatory compliance. Staying informed about these standards helps in making informed decisions for optimal air filtration.

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