Retraction: The above article from Chemical Engineering and Technology, published online on March 19, 2009 in Wiley Online Library (), has been retracted by agreement between the authors, the journal Editor in Chief, Dr.Barbara Boeck and Wiley-VCH Verlag. The retraction has been agreed due to overlap between this article and the following article published in Chemical Engineering Science, A case study of simulating submicron aerosol filtration via lightweight spun-bonded filter media by Q. Wang, B. Maze, H. Vahedi Tafreshi, B.Pourdeyhini, Volume 61, 2006, pages 4871-4883.