The filters I purchased are well-made and at a reasonable price. I consider myself a pretty good expert end user. I recently retired from a school district as a supervisor of facilities. We had four buildings with a total square footage of over 300,000 ft. (we used a lot of filters and even a lot more with Covid-19. I became very familiar with filters during the whole COVID-19 fiasco. It was a nightmare dealing with the teachers unions. I would recommend the use filterbuy filters but just dont get caught up in the whole Merv-mania thing
Filament not lined up on several bottom rungs , pattern runs off which made for a 1/2 gap on lower corner., had to put tape on gap.Very poor quality control. Ordered lowest quality but still no excuse for this