Bests & Worsts Reviews from Amazon

I bought these filters to try what many consider the 'gold standard' of HVAC filters. What a joke. The first two images show gobs of hot melt glue on the paper face of each of the filters. This is the face that should seal up to the air return filter housing. No sealing taking place here. While this is just poor quality control. The more egregious fail is in the economy approach to overlapping the cardboard frame in each of the four corners. This is a designed in leak path that they deliberately build into each filter, in each of the four corners. Every filter, every corner, every day. Trivial, you say? They promote filtration down to 0.3 micron in this model, yet put four leak paths of .017" (254 microns) in each and every corner? Sorry, this approach is just bogus. These two filters are going in the trash, and I'm back to the Nordic Pure MERV 12 product. Better design, better QC, 1/3 the cost, and made in the USA (vs. Mexico for 3M).