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One thing you got to think about when comparing filters is that the BHAFs have a lot more surface area and therfore there is "less" suction at anyone point on the filter's surface...and therefore it isn't going to act like a vacuum cleaner to dirt (the dirt will fall out of "suspension" preferentially).
And just like any other filter, filtration abilities will vary filter to filter because of the filter media. One BHAF may filter worse than another similar BHAF because of the media...filter design has little to do with filtration, it has everything to do with the media.
I think I have read before that paper filters are still the best filters...I know I could see light through my K&N...
steved
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