Numerical and experimental investigations are carried out to characterize the pressure drop of a separator-type HEPA filter, by studying the pressure drop of a filter element with a different separator height. The element for pleated filter is assumed to have square cross-section bounded by the separator walls, consisting of two square flow channels separated by the filter medium. The total pressure drop was numerically calculated and compared with the experimental pressure drop measured with two dimensional model filter elements. It was found that, for a given configuration of filter element, there exists an optimal separator height that gives the minimum pressure drop. The pressure drop through filter medium determines the total pressure drop of the filter at a large separator height, while at a small separator height the friction in the flow channel dominates the total pressure drop.
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