A Brief
EN ISO 779:2018 is an international standard that provides a method for determining the filtration efficiency of air filters used in general ventilation systems. It is widely used by professionals in the field of mechanical engineering, HVAC (Heating, Ventilation and Air Conditioning), and indoor air quality testing.
This standard specifies the test procedure and the classification system for particulate air filters based on their ability to trap airborne particles. It helps assess the efficiency and performance of different types of air filters in terms of removing dust, pollen, mold spores, and other contaminants from the air.
The Test Procedure
The EN ISO 779:2018 standard outlines a rigorous testing method that involves challenging the air filters with synthetic particles of known sizes. The efficiency of each filter is then determined by measuring the particles captured by the filter and comparing it to the total number of particles present in the test air stream.
The test is conducted under controlled lab conditions using a particle generator, an aerosol photometer, and a collection device. The air filters are subjected to a range of particle sizes to evaluate their effectiveness across various contaminants commonly found in indoor environments.
The Classification System
EN ISO 779:2018 classifies air filters into four categories based on their filtration efficiency:
Class G1: filters with a minimum filtration efficiency of 50% for particles with a diameter of 10 μm or larger.
Class G2: filters with a minimum filtration efficiency of 65% for particles with a diameter of 10 μm or larger.
Class G3: filters with a minimum filtration efficiency of 80% for particles with a diameter of 10 μm or larger.
Class G4: filters with a minimum filtration efficiency of 90% for particles with a diameter of 10 μm or larger.
The classification system allows users to choose the appropriate filter based on their specific needs and requirements. It helps in ensuring that a ventilation system provides clean and healthy air while minimizing energy consumption and maintaining optimal system performance.
Conclusion
EN ISO 779:2018 is an essential standard that plays a crucial role in evaluating the effectiveness of air filters used in general ventilation systems. By following the test procedures outlined in this standard, professionals can accurately determine the filtration efficiency of different filters and select the most suitable ones for specific applications.
This standard contributes to creating healthier indoor environments by ensuring that the air we breathe is free from harmful particles and pollutants. It also helps in optimizing the performance and energy efficiency of ventilation systems, leading to improved comfort and well-being for occupants.
Nina She