Sziasztok, Esetleg jól jöhet itt sokaknak: http://www.gore.com/en_xx/products/venting/protective/pressure_equalization_five_year_study.html http://info.sealingdevices.com/acton/attachment/13432/f-0013/1/-/-/l-0009/l-0009/Gore%20Jason%20Zambotti%20Pressure%20Differential.pdf Viktor