re: Cabin air filters? Necessity or a rip off

quote:

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Wonder if it’s based on air flow measurement? Vacuuming it would get the large stuff but dust/pollen/particulates could still be embedded in the filter media and restricting air flow.

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This is probably the correct answer. I'll admit the cleaned older filter wasn't nearly as white as the new one, even though I vacuumed out all the big stuff. I'm going to try the keyboard duster can trick next time inside that slot.