Dust generation is a primary by-product of the crushing operations followed for converting run of mine (ROM) ore into consumer grade ore. This wet dust is further energised by the volume displacement created from tipping large quantities of ore into the crusher feed chute. This poses a significant problem during the normal operation of a particle size analyser (PSA) system which was developed for detecting larger rocks entering the gyratory crusher. The implementation of this system allows the crusher to ramp up mid-operation and minimise bridging by producing greater crushing power for crushing larger rocks. Visually analysing the hot air curtain formation and flow drives the computational fluid dynamics (CFD) analysis for this study. The novelty of this concept creates a valuable opportunity for understanding the flow of air and the heat transfer through the intricate design of the camera lens using CFD. A series of turbulent flow regions from the incoming hot air is created around the housing to provide induced separation regions. This provides the required lift force on the surface for opposing dust, as well as reducing moisture build up from the surrounding moist air through heat transfer. This CFD analysis identifies the desired flow regions for the purpose of future simulations including particle tracking. This presents a promising approach to determining the effectiveness of the hot air curtain system and efficiency of the dust settlement prevention.