These are definitely inferior quality to 3M Filtrete. They sag a large amount after 2 weeks of my blower sucking air through them to a much greater degree that my Filtrete 2200 filters. The wire mesh support on the Filtrete is much better and allows the filters to sustain the pressure drop for longer before replacement. I will not buy the FilterBuy ones again. BTW I dont expect this review to be publicly posted which is also dubious and suspicious
Perfect filter for our home Merv 13. We can definitely tell the difference between Merv 11 and 13. Our allergies on our home have improved and my husband has stopped sneezing since we changed the filter.