I have read a million articles and wanted to buy the best filter as my son is allergic to dust. Most of the information I found said anything above merv 10 is considered commercial grade and a typical home unit may not let enough air through, reducing efficiency and increasing running costs. So we opted for Merv 10, the highest apartment complex which seemed to get good reviews and was a good price. We're happy with it so far, but have only used 2.
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