Review on High-Quality Nispira True HEPA Air Filter Replacement for Holmes AER1 HAPF30AT Air Purifier - Pack of 4 HEPA Filters + 4 Carbon Filters by Ronald Cambridge

Replace I will say these filters fit my Aer1 replacement air filter. I wouldn't say they filter well. When I first opened the box I was shocked at how cheap they are. My guess was confirmed after about a week of use. I use an ultrasonic room humidifier that emits what is called "white dust”. A true Aer1 filter always did very well, but changing every 45-60 days was getting expensive. I tried them as a cheaper alternative. These are NOT HEPA filters. They don't even touch the white dust. After a week, the edges around the outlet side of my air purifier were covered in white dust. It went straight through the filter. I will never use them again. Lesson learned. Sometimes you get what you pay for. NT HEPA Filter Compatible with Holmes AER1 Total Air For Purifier HAP242-NUC, 6 Filters