Indoor air quality including metro subway is of recent interests in large cities. Inflow air to the inside of the train and circulating air flow through MVAC of stations contain large amount of iron based fine particles. This paper evaluated the collection of such a dust by magnetic filters as comparing to conventional particle capturing mechanisms such as inertia, direct impaction and diffusion. It was found that filtration velocity, magnetic field intensity, and fiber size were the most important parameters for magnetic filtration. Application of magnetic force obviously enhances the collection efficiency particularly in fine modes smaller than 10 mm. However, its effect was found greater in 2.5 mm than submicron particles.

• Shan Huang
• Hae-Woo Park
• Young-Min Jo(Department of Environmental Science Engineering, Kyunghee University) Corresponding author
• Young-Koo Park(Department of Environmental Engineering, Kangwon National University)
• Youn-Che Kim(Department of Material and Metallurgical Engineering, Kangwon National University)