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Mainly just messin with ya. To elaborate, maybe the reason you think the paper filter (dust filter) makes such a big difference is that the "large bore" pollen is being filtered by the paper filter, which is what helps you, but smaller pollen (which I an surmising is NOT being trapped by the dust filter) is still making it through, but doesn't bother you.
I can try searching some of my documents here at home and see what MB says the advantage is to the charcoal filter, I was sure I read it traps finer pollen particles than the dust filter.
Gilly
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