Methods for evaluating and reducing the hydraulic resistance and optimizing the power consumption of FRKDI filters were assessed. Hydraulic losses were calculated by determining local hydraulic resistances along the gas flow from the inlet to the outlet of the filter and summing these values. The hydraulic resistance was at a maximum in the inlet and outlet nozzles. The design variations of various FRKDI filters are shown and the hydraulic loss dependence on the gas load on the filter plates is plotted. Tests indicated that resistance could be reduced by increasing the size of the inlet and exit nozzles and properly configuring the guide vanes.