These filters are not marked anywhere. I thought I would buy Merv 12 filters which is definitely NOT the case. The size was good for our 24x24 return. The filter is almost transparent. I tried to get filters easier by having them delivered. Nowhere on the packaging or filters is it marked as Merv12. Indeed there is a place to write, and it is empty. I compared them to two of our other filters, one from 3M and the other from Home Depot's Honeywell. You cannot see light through our other filters like you can through these Nordic Pure filters. Our other filters last 3-6 months before needing to be changed depending on the time of year. These Nordic Pure filters needed to be changed slightly after a week of use. I would not recommend these filters and would never buy them again. Buyer beware
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