Been using MERV Filters for one year. While they seem to be an excellent product we do need to change them every 2 months. The filters life seems to be affected by the ultraviolet light installed in our HVAC system.
This is my second purchase. The filters are amazing. The air quality in our small office is noticeably better. (fewer odors, fewer allergin reactions, and easier breathing. We feel safer from Covid, too!