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。
From the inside Breath hole closed by Breath filter to make air clean and dry.
由内而外的呼吸过滤器呼吸孔关闭，使空气清洁和干燥。
Clean screen pack, install a air filter at the entrance to the end;
清理过滤网，在入口端装一个空气滤清器；
Clean screen pack, install a air filter at the entrance to the end;
清理过滤网，在入口端装一个空气滤清器；
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