Review on 🌬️ Nordic Pure 16x20x1 Pleated Air Filter 16x20x1M12 6 Pack - High Performance Filtration Solution by Michael Foster

I have been buying these filters for several years and always buy them in bulk. I had to replace a filter the other day and for the first time in these filters I noticed one where the pleat was cut short and didn't fit the underside of the cardboard frame leaving a large air gap. As I bought this set of 12 a year ago they cannot be returned or exchanged from Revain. Be sure to visually inspect ALL filters upon receipt. Otherwise good filters at a good price. Unfortunately I cannot replace this defective filter. TO UPDATE:. I bought 12 more packs after trying another brand and not being happy with how poorly made they were. This time I've noticed black spots on the bottom of the new filters, it seems edge adhesion testing can now be part of quality control. Everything looked fine.