Numerical studies have shown that the prediction accuracy of air velocity and temperature distribution is highly influenced by the location and type of air diffusers [13], [14] and [15]. For instance, Sun and Smith [16] studied the air flow characteristics close to the square cone diffuser, and found that the offset and lips of the diffuser worked together to determine the discharge air angles. FADS also serves the functions of ducts and diffusers as it can transmit and distribute the airflow. Therefore, as a new diffuser, the performance of FADS such as fiber penetrability would affect airflow dispersion characteristics. The performance is, in turn influenced by many factors, e.g. the fiber porosity, fiber diameter and the textile technology, etc. For example, Lekakou and Bader [17] numerically studied the effect of parameters, including fiber volume fraction, fiber tow diameter and injection pressure, on the fluid through woven cloths. They pointed out that the apparent global permeability depended on the injection pressure, and, its variations also depended on the fabric architecture and fiber volume fraction in the regime of relatively low injection pressures. The research by Kwon et al. [18] showed that the decrease in the fiber diameter of the fabric decreased fiber porosity, but increased fiber density and mechanical strength. However, the effects of these factors on the characteristics of air velocity and pressure inside FADS are rarely studied. According to our previous work, the static pressure inside was the main power to overcome the total resistances due to porous fiber and to distribute airflow within a room. Since the static pressure inside is related with the supply air flow rate, the higher the supply air flow rate is, the bigger the static pressure inside and the total pressure are. Furthermore, the magnitudes of both the pressure inside FADS and the supply air flow rate are positively related the fan energy consumption and noise level. Hence, the fiber configuration of FADS influences the airflow characteristics as well as the fan energy consumption and noise level.