In this study, two kinds of polyacrylonitrile (PAN) (carbon fiber grade PAN and oxidized fiber grade PAN) are used as the raw materials for a PAN-based nanofiber nonwoven that is prepared using electrospinning. A high-temperature erect furnace is then used, which uses oxidization processes to prepare oxidized nanofiber nonwovens in a continuous manufacturing process. The parameters used for the oxidation process are oxidation temperatures of 150, 200, 250, 275, 300 and 300 degrees C, which correspond to a production rate of 3, 5 and 10 cm/min at 5-cN tension. The variation in the yield rate, the breaking strength and the shrinkage of the oxidized PAN based electrospun nonwovens are examined in this study. The results demonstrate that the limit oxygen index (LOI) and aromatization index (Al) increase as the production rate decreases. Under the optimum oxidation conditions, higher quality oxidized electrospun nonwovens are produced using carbon fiber grade PAN with AI of 61 % and LOT of 42 %.