Five modifications of a standard 1D3D cyclone were tested and compared against the standard 1D3D design. The modifications to the 1D3D design included: 1) a 2D2D air inlet, 2) a 2D2D air outlet, 3) a D/3 trash exit, 4) an expansion chamber with a D/3 trash outlet, and 5) a tapered air outlet duct. The 1D3D modifications that exhibited a significant improvement in reducing both PM10 and total suspended particulate (TSP) emissions were the designs with the 2D2D inlet and air exhaust combined with either the regular D/3 tail cone or the expansion chamber . In reference to the standard 1D3D, the average reduction in PM10 emissions was 24 to 29% with a 29 to 35% reduction observed in TSP emissions. The modifications with the tapered air outlets did not show any significant improvements in controlling PM10 emissions compared to the standard 1D3D. However, the modification with the tapered air outlet/expansion chamber combination exhibited statistical significance in reducing TSP emissions by 18% compared to the 1D3D cyclone.