The prerequisite for the maximized efficiency of malodor prevention control systems is to have a perfect sea of the odor control cover system and the complete capturing capacity of the duct equipment. Based on its 20 years of operation experience and understanding of malodor prevention and control systems, Exen conducts T.A.B. The company also optimally adjusts the whole duct system, depending on malodorant loads, by measuring the malodorant loading rates such as flow rates of the main and branch ducts and malodorant concentrations.