Air filters used in general ventilation EUROVENT 2004 - Round Robin Test on the basis of EN 779 Annex A

Résumé et principaux résultats

EN 779 has been recently revised at the end of 2002. EUROVENT WG4b group members have agreed that additional work is necessary in order to increase knowledge on Annex A test procedure. It has been decided on the occasion of the EUROVENT WG4b meeting held in Paris, April 1st, 2003, to carry out a round robin test on the basis of EN 779 (2002) Annex A test procedure.
The main objective of this round robin test is to assess EN 779 (2002) Annex A test procedure : do all participating labs obtain the same results ' Do the different methods (isopropanol treatment, diesel fume loading, surfactant treatment, natural loading ; filter medium or full size filter) give the same results ' Do laboratory test results well represent the real behaviour of the filters '
Two different kinds of F7 bag filters (one made with electrostatically charged synthetic medium and one made with glass fiber medium) have been tested according to EN 779 (2002) Annex A test procedure.

For the synthetic filter, the results (decrease of the efficiency of the treated filters compared to the untreated filters from around 80 to 40 %) are very close when the following treatments are used :

- isopropanol on medium sample,
- diesel fume on full size filter.

For the glass filter, there is a slight decrease (few %) of the efficiency when isopropanol, diesel fume and surfactant (full size filter) treatments are used and there is a slight increase (few %) when surfactant is used with the medium sample.

According to the results obtained on the occasion of this round robin test, all the methods proposed by EN 779 Annex A do not give the same results and therefore they are not equivalent.

Commissions

Filtration de l'air

Thème

Ventilation et qualité de l'air

Mots-clés

Essais comparatifs, Filtration, Filtres, Filtres à manche, Méthodes d'essais des matériels

Auteurs

GINESTET Alain