@CleanAirStars @eswillwalker @JimRosenthal4 Correct, I don't know how they do that. Not all of them have a separate light for the pre-filter.
@CleanAirStars @eswillwalker @JimRosenthal4 正确，我不知道他们是怎么做到的。并非所有人都有用于预过滤器的单独灯。
@CleanAirStars @eswillwalker @JimRosenthal4 Correct, I don't know how they do that. Not all of them have a separate light for the pre-filter.
@CleanAirStars @eswillwalker @JimRosenthal4 正确，我不知道他们是怎么做到的。并非所有人都有用于预过滤器的单独灯。