Review on 2-Pack FLT4825 True HEPA Filter B Replacement with Activated Carbon Pre-Filters for Guardian Air Purifier Models AC4825, AC4300, AC4800, AC4900, AC4850 by Josh Chenier

I bought these because they were much cheaper than the Veva brand and looked the same. I have found that they are very good at picking up dust and dirt from the living room floor. The Velcro function for attaching the pre-filter to the normal filter is very cool. However, it is important to note that these filters had to be clipped in to fit into the air purifier's filter housing or filter chamber. They don't fit exactly as easily as the Veva brand. It's also important to note that the flashing red light which means something is wrong with the machine will flash when this filter is installed, oh and I've never had this problem with OEM branded filters. That's how they get the job done, albeit a bit shaky.