Review on DerBlue Replacement HEPA Filters: Improve Air Quality with AER1 Type Total Air Filter, HAPF30AT for Holmes Purifier HAP242-NUC by John Galbraith

I bought these filters because they said they would work just as well, but I was disappointed. Well they got to my car, when I turned the car on it started making a horrible rumble like the air was struggling to get through the filters itself. I double check they were installed right upside down or something but no I installed them right then I started to wonder if maybe the car was just acting weird but when I put my old AER Filter used, it worked fine again. . Apparently buying the universal filter didn't save me any money this time because I ended up buying and throwing out the regular filters. I hate being wasteful, but I don't risk it with my air purifier.