This paper presents and analyses the production and emission of pollutant soot and CO from a 2 MW cylindrical furnace of variable length. The experimental measurements were carried out using infra-red and filter paper techniques to measure CO and soot, respectively. The soot formation is modeled by using the soot particle number density and the mass density based on acetylene concentrations. The soot oxidation is modeled using the oxidation model, which assumes soot combustion occurs by both oxygen molecules and hydroxide radicals. The predicted radial variations of temperature, CO, and soot at four axial cross sections, and the effect of furnace length on pollutant emissions, compare well with the experimental measurements. The results show that CO and soot mass fraction emissions decrease with increasing furnace length. The results also show that the location of the centerline soot maximum coincides with the maximum CO location

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