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Knowledge is power
All air filters of TOPS are tested according to the certificates for air filters EN779. This standard states the minimum conditions that have to be met by a filter. This means the standard is used as a quality mark. Besides this, this provides you with an easy and objective method to compare the products of different manufacturers. The EN779 is therefore a useful filter in the offered suppliers. During recent years the demands have been changed multiple times.
Tops luchtfilters only delivers products that meet the european standard. Contact us for more information or a non-binding quote.
Standards for air filters since 1980
The Eurovent 4/5-1980 can be seen as the foundation of the certificates as we know it today. This was a takeover by the American standard ASHRAE 52-76. Eurovent decided to publish a separate leaflet, to classify filters based on this. Separate guidelines emerged for pre filters and fine filters. Besides his, Eurovent 4/5-1980 was the foundation for multiple national standards in Euro
The Eurovent 4/5 was adapted as the certificates EN779:1993 in 1993, which resulted in a European norm that had to be met by the different European countries. Pre filters were to be known as G1-G4 from now on, while the fine filters were called F5-F9. EN779:1993 also specified the maximum terminator values that had to be applied in the testing of the filter. These values were 250 Pa for the G-Type filters and 450 Pa for the F-Type. The standard used today therefore found its origin in the standard of 1993.
Relative to the old coloring efficiency rate the Eurovent 4/9-1993 introduced the efficiency per particle size. From this moment it became standard to classify fine filters based on their efficiency rate, at a particle size of 0.4 µm. This value was close to the old coloring rate and was therefore a logical starting point. The advantage here was that the filters could keep the same filter class as they were given during the old test procedure regarding coloring. With this introduction the minimum starting efficiency rate of 20% for fine filters disappeared. These actions were a big step towards the standard as we know it today.
It was the renewed certificates EN779:2002 that finally took over the method Eurovent 4/9. The average coloring efficiency rate was definitively replaced. The EN779:2002 also adopted a method of the NT VV 177, in order to determine efficiency rates of electrostatic filter media. This was adopted in Annex A in EN779:2002. Annex A was part of the standard, but was not adopted in the determination of filter type. Within the standard, it was also allowed to use different discharging methods. Many companies chose Isopronanol (IPA) and diesel smoke. The latter is very suitable for the discharging of complete filters, while IPA better suits the treatment of media samples.
The newest version of the certificates is known today as EN779:2012. This elaborates more on the classification of the fine filters, by using a minimum requirement for the efficiency. This is an addition to the average efficiency for filter type F7-F9.
For discharging on the IPA is allowed, that is used for medium samples. It is required to treat at least 3 samples and a total of 600 cm2 with IPA. The minimum efficiency does not apply to type 5 and 6. The name of the filter types has changed from F5 to M5 and from F6 to M6, in order to clarify the difference in testing methods.
Standard filters are classified according to EN779:2012
|Group||Class||Final pressure drop (test) Pa||Average arrestance (Am) of synthetic dust%||Average efficiency (Em) for 0.4 ųm particles%||Minimum efficiency (ME) for 0.4 ųm particles%|