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    You were using a merv 10 and dust dropped when u...

    You were using a merv 10 and dust dropped when u switched to a merv 7?
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    anything less than MERV 12 captures less than 4%...

    anything less than MERV 12 captures less than 4% of the particulate matter in the air...most stuff in the air is less than 1 micron in size (1/25400 of an inch ) that will go through ANY pleated...
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