@GainOfDystopia @LazarusLong13 @SteverRobbins Every consumer grade air "HEPA" cleaner I've ever seen (quite a few) has pretty mediocre friction fit with loose foam or even no foam. I'd be shocked if any of them don't significantly leak.
@GainOfDystopia @LazarusLong13 @SteverRobbins 我见过的每一种消费级空气“HEPA”清洁剂（不少）都具有相当平庸的摩擦贴合性，松散的泡沫甚至没有泡沫。如果其中任何一个没有明显泄漏，我会感到震惊。