Comments / References

(1) The descrioption of the designed sample contains the description of the filtration material(kind/surface weight in g/m²/, the thickness), the datas of the surface and placement of the filtration material and the assembly of the filtration parts(pockets).

(2) EN 779; July 1973: "Partikel-Luftfilter für allgemeine Raumlufttechnik - Anforderungen, Prüfung, Kennzeichnung".

(3) The content of the artificial test dust acording to EN 779 is stated as follows: the test dust "Air Cleaner Fine" 72% weight the soot "Molocco" 23% weight cotton "linter" 5% weight The composition and the properties which cannot be compared to natural Middle European outside aerosol. The measured results of the dust sedimentation according to EN 779 cannot be used for the calculation of the life expactancy with natural outside air aerosols.

(4) For filters of the group H it is allowed to make a test of leakage using so called "stream test" with oil mist according to EN 1822-4, amendment A. The testing part is mounted onto the chamber and the air flow with a high content of parafin oil is entering the filter. The exit part of the filter is lighted by a lamp in a dark room. There is no leakage if there are not any streams visualy recognisable on the dark backround.

(5) EN 1822-1; April 1998; "Schwebstofffilter (HEPA und ULPA)" - Teil 1: Klassifikation, Leistungsprüfung, Kennzeichnung.

(6) "Les filtres de ventilation generale: Signification de leurs haracteristiques determinees suivant les normes existantes", J. Michel, CETIAT, F-Orsay, FILTRA 86, Paris, 2. Oct. 1986.

(7) "Filtration Characteristics of Prefilters...", J. Schier, Luwa AG, Zürich, 10th International Symposium on Contamination Control (ICCCS), 10. - 14. Sept. 1990, Zurich, Switzerland.

(8) "Can we trust air filters", J. Gustavson, Camfil AB, S-Trosa, Filtration + Separation, March 2000.

(9) SINTEF, 1995. Lifetime Test of Air Filters in Real Application, SINTEF, STF A95027, Trondheim, Norway.

(10) Lähtimäki M. 1998. Performances of Ventilation Filters, Pilot field study, filter material test and full scale field test. VTT, Tampere, Finland, June 1998.

(11) Kuehn T. H., Yang C. H. and Kulp R. H. "Effects of Fan Cycling on the Performance of Particulate Air filters used for IAQ Control". Indoor Air 1996. The 7th International Conference on Indoor Quality and Climate, Vol. 4. Page 211.

(12) Rivers R. D. and Murphy D. J. Determination of Air Filter Performance under Variable Air Volume (VAV) Conditions. ASHRAE 675-RP (1996).

(13) Phillip B. A., Davis W. T., and Dever M. Investigation of the Effect of a Topically Applied Tackifier in Reducing Particle Bounce in a Melt-Blown Air Filterť. Filtration & Separation, 1996, Page 933.

(14) Qian Y., Willeke K., Ulevicius V. and Grinshpun S. A. Particle eentrainment from Fibrous Filters. Aerosol Science and Technology, 27:3.