<p>This study examines the influence of geometric and operational parameters on the performance and stability of a 42-inch axial mining fan through numerical simulations and performance curve analysis. A three-dimensional model of the fan was simulated using the ANSYS CFX computational fluid dynamics (CFD) software, employing the k-ε turbulence model. The investigation focused on the impact of pitch angle (ranging from 33.5° to 58.5° in increments of 5°), blade-to-tube clearance (1 mm, 7 mm, 15 mm, and 20 mm), and rotational speed (1800, 2700, and 3600 rpm) on the fan's stability and performance. Performance curves were generated and analyzed to assess these effects. The numerical validation curves demonstrated strong alignment with data provided by industry partners for matching geometries. The analysis revealed that increasing the pitch angle extends the stable operating range toward higher flow rates and pressures, though selecting a smaller pitch angle for a specific allowable flow rate enhances efficiency. Reducing the tip clearance from 20 to 1 mm resulted in a marginal increase in the critical flow-rate difference (Dcri) of approximately 3%, but a substantial rise in total pressure by 24.27%. Additionally, increasing the rotational speed enabled the volumetric flow rate to scale by a factor of R and the total pressure by a factor of R², where R represents the ratio of the new speed to the original speed.</p>