Revisions of the standard EN779:2012
We have peparred an information letter for you regarding the changes in EN779:2012 containing :
- New: Revision EN779:2012, - the european standard for HVAC Filtration. What will change ?
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- Comparison: HS-AirSynErgy vs. Premium class Glassfibre Filter.
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The dispute of the italian Uni against the changes to EN779 was settled by end of March 2012. The revision of the standard EN779:2012 will be valid as EN standard very soon.
The essential modifications are:
- minimum efficiency for filter of class “F” at their (electrostatic) unloaded state (M.E.)
- new classification M5 and M6 instead of F5 and F6
- leak tests for assessing the level of efficiency (0.4 µm), the aerosol DEHS (Di-Ethyl-Hexyl-Sebacat) is to be used as a standard procedure.
The classification in compliance with EN779:2012 divides filter into Group-G and Group-F filter for coarse and fine dust adsoption. Accordingly, in the future there will be three filtration efficiency levels – G, M, and F. Filter that state a filtration efficiency for particles of 0.4 µm of 40 percent or less will be marked as class G.
The categorization of filtration Group G (G1 – G4) is based on the average dust holding capacity (gravimetric / weight). As for Group F and M, the determination of dust holding capacity will be an indicator for the filters lifespan. It won‘t be used for classification matters. Group M will include all filter with an average filtration efficiency of 40 percent of higher but with an efficiency of 80 percent or less for particles of 0.4 microns. Therefore, class F5 and F6 will fall by the wayside. Class M5 and M6 are to replace them. Other than that, the efficiency levels will be the same. Filter with an efficiency of 80 percent or higher for particles of 0.4 microns will be marked as Group F. Their overall efficiency is to be determined as before. But, according to the new procedure Group F-filter are to uphold a “minimum efficiency” (short: M.E.) which indicates the primary efficiency at the state of being electrostatically discharged This will be a mandatory criteria for all Group F-filter. We predict that for most commonly used synthetic filter media this will be hard to achieve.
classification according to group or class according to EN 779:2012
