Review on 🌬️ CoreCarbon 4-Pack Pre-Filter for Honeywell Air Genius 3-6 Purifier - HFD300, HFD310, HFD314, HFD320, HD320, HFD323CV1, HFD323-TGT, HFD324, HFD360B by Michael Gilmartin

This is an updated review of the CoreCarbon Exact Fitment 4-Piece Kit used with the Honeywell AirGenius 4 (HFD310). I have since changed my rating from 1 star to 5 stars. I bought these filters in mid-March and had a sizing issue where the filters were slightly shorter on the sides creating a gap wide enough to affect filter efficiency. Since I saw that they didn't fit, I returned them. About a week later, a CoreCarbon rep contacted me to say their filter sizes were being updated and made more precisely to specification. The rep sent replacement filters on condition that I check their filters. Again, I emphasize the high quality in terms of weight and thickness of the CoreCarbon filter media, which appears to be much heavier than the Honeywell OEMs. Updated, resized filters fit snugly into the back panel with virtually no gaps. At around $3.90 per filter, these CoreCarbon filters are an excellent value compared to OEMs who cost around $9.25 per filter. I will definitely be ordering these again.