@GainOfDystopia @LazarusLong13 @SteverRobbins Not sure your point here. Within reason it doesn't even matter much what exact filter you use for a device like this. The 3M ones are pretty good though, in terms of airflow, filtration and cost (especially if bought on sale).
@GainOfDystopia @LazarusLong13 @SteverRobbins 不确定你的意思。在合理的范围内，您对这样的设备使用什么确切的过滤器并不重要。不过，在气流、过滤和成本方面（尤其是在打折时购买的），3M 的都相当不错。