Product review (1 stars): I'll never buy from this seller again.
The two filters arrived unboxed, just thrown in a plastic mailing bag, and then completely mangled by USPS because they were unprotected.  One filter was able to be fixed and used, not sure about the other yet. I also seriously doubt this was the BestAir brand that the seller is advertising.  I think these are generic filters the seller is trying to pass off as a brand name.  Avoid this seller!

UPDATE: The second filter proved to be unusable.  It was too badly mangled to be straightened out and used so it wound up in the trash.  DO NOT BUY FROM THIS SELLER!