Review on Cabiclean True HEPA Replacement Filter for Honeywell HPA Series Air Purifiers, 6 Pack by Jason Sisawang

These filters are great price and appear to be good quality although it is very hard to say for sure about the quality of the filter : You need to test them with an air quality monitor to see if they really are filtering out the particles that they should. But that's a problem with any air filter. A note on them: unlike all other similar filters I've used, they don't have an arrow on the side indicating which direction air should flow through them (so you know which way to install them) . They have small protrusions on one side, and those protrusions always face outward (toward the incoming air) on other filters I've used, so I think I installed the filters correctly. But it would be a lot easier if they printed an arrow on the side of the filter like other brands do.