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*****NOTICE ***** PRE-FILTERS ARE DESIGNED TO BE LARGER THAN AND PROPERLY COVER THE HEPA FILTER. NOT TO COVER THE HOUSING GRILL. NO AIR WILL BYPASS THE PRE-FILTER. REFERENCE IMAGE #2. CoreCarbon Prefilter Overview This high-quality replacement pre-filter is designed to exactly fit Honeywell* Air Genius 3, Honeywell* Air Genius 4, Honeywell* Air Genius 5, Honeywell* Air Genius 6 Air Purifiers - Models HFD300, HFD310, HFD314, HFD320, HD320, HFD323CV1, HFD323-TGT, HFD324, HFD360B. Can be cut to fit but Not sized for the: Air Genius Compact Models: HFD280, HFD280B Can be cut to fit but Not sized for the: QuietClean Models: HFD070, HFD-120, HFD123, HD123, HFD-140, HFD140, HFD140BWM, HFD230 Our finely ground, powdered, coconut shell, activated carbon media provides superior surface area for adsorption of VOC’s and other odorous gases (Minimum of 60% CTC). Powdered carbon provides faster adsorption than granular carbon and is cleaner to handle during replacement pad changes. Each microporous activated carbon replacement pad provides the adsorption surface area of over 50 tennis courts. Replaces: CoreCarbon pre-filters are replacements for the listed purifier models that require HRF-K2 (Labeled as “K”). Specifications: Pre-filter size: 5-3/4" x 20-5/8" Nominal thickness: .200” (thicker than OEM replacements) Material: High Grade Powdered Activated Carbon Quantity: 4 Pre-Filters – Exact Fitment *Registered mark of air purifier manufacturer. The products advertised on this page are manufactured by CoreCarbon.