Ordered these for price and availability when I needed to change my air filters early after filtering smoke out of my house from local wildfires. They arrived today and I wanted to collect my used filter from home. There is a clear difference. The old Merv 12 filter has twice as many pleats. There are no markings on the box to indicate it is Spider Merv 12 or it was the wrong box and they sent me Merv 8 so I can't tell. I'm not a ventilation specialist either, so I could be wrong, but I won't be ordering this brand again. I'll use what I have and just change them up early before going back to my regular brand (which wasn't available at the time I had to order). This is a great price for filters if you don't have any particular expectations and just want a decent filter (like the Merv 8), but I doubt it will perform as well as the Merv 12 I thought I'd order have.
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