This study evaluates the performance of two high-efficiency cyclones – the Stairmand HE and Swift HE designs – for application in an inertial separator for condensable substances, a system aimed at recovering volatile organic compounds from industrial exhaust gases. The cyclones were designed to operate at 8 m³/h, manufactured via selective laser sintering using polyamide PA2200, and experimentally tested in an aerosol test rig using DEHS to measure fractional collection efficiency and pressure drop across flow rates of 3, 4.5, 6, 8, and 10 m³/h. Experimental results were compared with predictions from the Iozia and Leith theoretical model. The Stairmand HE cyclone showed strong agreement with the model at 4.5, 6, and 8 Sm³/h, with mean absolute errors ranging from 3.42 % to 6.15 % and overlap coefficients of approximately 90 %, whereas the Swift HE cyclone consistently exhibited higher experimental efficiencies than predicted, particularly at elevated flow rates, indicating limitations of the model for this geometry.