They seem to work better than most brands in the same price range. The MERV 12 rating is quite high and meets most of our needs. I have airflow monitors here and they work fine even if they seem dirty, but once you install anything with a MERV rating above 12 the airflow changes quickly. with low dust accumulation, since the pore size of the filter material is saturated faster and the filters need to be changed more often.
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