This is a MERV 13 filter This is the same filter that has been used for the past four years and has been replaced regularly since the HVAC retrofit was installed four years ago on a new oven. It works so well that early this summer, after a hot month in August, the filter turned black from ashes from nearby wildfires. It really helped keep the air in the house clean and safe to breathe. Very happy with this filter.
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