@robwiss I think that's a better design, since you have negative pressure holding the filter against the seal. Just friction is at the mercy of the foam not leaking or loosening up, or the filters just collapsing inward at some point, perhaps due to vibration or thermal expansion.
@robwiss我认为这是一个更好的设计，因为你有负压保持过滤器紧靠密封。摩擦取决于泡沫是否泄漏或松动，或者过滤器是否在某个点向内塌陷，可能是由于振动或热膨胀。