For surface velocity testing, the inflow air velocity will be measured at the door open position; the door open position is 20%, 50% and 100%. (average inflow velocity 0.45 ± 0.05 m/s). Additionally, smoke visualization was tested by generating test smoke in front of the fume hood to check for the presence and leakage of vortices/turbulence. Finally, test for trace gas contaminants by checking for gas leaks with a gas sensor. (less than 0.1ppm). The ventilation system is to realize the function of ventilation, including a complete set of devices including air inlets, air outlets, air supply ducts, fans, cooling and heating, filters, control systems and other ancillary equipment.