I went looking for a HEPA rated filter and saw listings for Filterbuy. Having used your filter products previously, I thought I'd found the perfect answer. But upon receiving the filter, it didn't show a HEPA rating. Now, I'm not sure that size of HEPA filter is available with your company. Other than that, all other factors, Filterbuy is an excellent company.
E-Z Flex filters have gotten too expensive. Filterbuy filters allow me to change my filters more often. Merv-13 filters make a difference during these smokey Canadian wildfire dangerous air quality days this Summer.
I put in a new A/C system with new ducts and wanted to make sure we have clean air in the house. They get dirty WAY faster than MERV 8 and I replace about a third more often now. But that's GREAT. I love to look at the accumulation of particles. Maybe someday I'll buy a microscope and look at it. But for now, I'm happy.
We got four of these (20x20x2 MERV 13), to build a Corsi-Rosenthal box (DIY indoor air purifier). Construction-wise, they worked fine for that. Haven't tested the IAQ officially, but there does seem to be an improvement. Wish the filters had more convincing "certified" markings for the MERV (not just a box checked off with a marker!).