The filter arrived on time. However, the box was previously opened on both sides. There is no marking on the filter itself that could determine the MERV rating. The box it came in was MERV 12. Who knows the actual rating of the filter itself. I use it now. I'll see if it filters anything. I'm sure the filter manufacturer sent the original filter in a sealed box. I think what happened is that Revain sent me a previously sold filter that didn't fit in their filter housing instead of a new filter as advertised. So who knows exactly what I got.
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