To clean air immediately a drive uses Recirculation filter.
要立即清洁空气过滤器的驱动器使用再循环。
Is your system operating with 100% fresh air, or is the system operating in recirculation?
您的系统运行时是采用100%新风方式，还是回风参与再循环的方式？
Is your system operating with 100% fresh air, or is the system operating in recirculation?
您的系统运行时是采用100%新风方式，还是回风参与再循环的方式？
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