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I have a whole-house fan that blows through a MERV 11 filter. My standard for comparison is a paper towel on the car's windshield. If two days from a clean windshield it's light gray that's normal. While the accelerationist arson is in season, dark brown in two days.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Impossible is just something we haven't done yet. -- Langley Outdoors Academy
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