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Desired Filter Efficiency

We rate filters by their MERV rating “Minimum Efficiency Rated Value”.  Rating filters by micron does not tell the whole story.

MERV 15 (Nanofiber) is very high: (C1425 Series) and all “NANO” filters.  These are surface loading filters and have a better dust release than the others.

MERV 11 (Spun Bond Polyester) is quite good (35A100SBOL). These have a good dust release.

MERV 10 (80/20 Paper Blend) is fairly good, certainly far better than micron rated bag filters.  These are depth loading filters and do not release dust as well as the others.

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