Sharp FZ-R45HFU (FZR45HFU) is Original Sharp Filter. Sharp FZ-R45HFU (FZR45HFU) contains HEPA filter and Carbon filter for Sharp FPP40CX, Sharp FPR45CX.
Sharp FZ-C46DFU (FZC46DFU) Carbon Filter is a Sharp original washable, reusable carbon filter for select Sharp air purifiers.