How do I know? do you have merv 13? I received 6 filters in a shipping box designed for the larger filter. There was a Merv 13 sticker on the packing box over the Merv 12 designation printed on the box, but the filters had no marking other than size. No Merv number, no barcode. These appear to be high quality filters that are less than half the price of 3M filters, but how can I be sure which one I bought? The 6 filters were not in the 6 pack as shown in the picture. Just individual filters in a big box.
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