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Now the severe haze affecting many parts of the world, many people also solve, methods of preventing haze in the study, like to go out with the mask, the ventilation inside the house. But many people do not know when the ventilation can achieve good results. This design is mainly comparing the quality of indoor and outdoor air, let the master know the best time window ventilation. On the circular screen green of the product represents the outdoor, and the red chamber represents the indoor, which occupies large area color description where the air is better.