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For responding the policy call of building a green and low-carbon society and meeting the goal of economizing energy and reducing emission in the process of construct. The troditional ceiling-exhaust ventilation system in restroom should be replaced by the new low-level wall-exhaust ventilation system for better exhaust effect and less air changes per hour which help in solving the existing problems, such as excessive design value of air changes per hour, serious heating/cooling loss and so on.