LOL as said in the 10Q, the RXAir units are filterless!! Maybe the older versions had a filter, but not the new ones!
UV Flu’s product line includes: ?RxAir ™ Residential Filterless Air Purifier ?UV400 ™ FDA cleared Class II Filterless Air Purifier ?RX3000 ™ Commercial FDA cleared Class II Air Purifier (news video with RX3000)