Indoor soot emission is a serious health problem in many industries. Indoor combustion is common in domestic as well as industrial applications. Indoor air contamination leads to non-communicable diseases like stroke, ischemic heart disease, lung cancer and chronic obstructive pulmonary disease according to WHO reports. Soot is a powdery mass made up of fine carbon particles. The main reason for soot is fossil fuel-based combustion. This research investigates the soot formation behaviors inside a SiC porous radiant burner (PRB). To numerically analyze the physical phenomena, mass, momentum and energy equations along with the soot formation mechanism based on a discrete sectional method have been employed. A premixed fuel-rich ethylene flame has been tested in this study, and the results for free flame and PRB have been compared. It was observed that in fuel–lean conditions, an appreciable amount of soot formation occurs in the PRB, whereas for fuel-rich conditions, the PRB helps in reducing the soot formation. The biggest soot particle diameter formed inside PRB was predicted to be around 19 nm smaller than the free flame case. This study also focuses on the soot formation behavior at various equivalence ratio conditions. It was numerically observed that the trend of soot volume fraction is significantly changed at around φ = 1.8. This study can pave the way to develop more effective burners in heavy industries including chemical processing, food and beverage industries, where indoor combustion is common.