Med-Dyne Brand Ultra-Fine Filters for the Respironics Duet LX, Bipap Pro, Synchrony, Synchrony-ST, and Harmony, 4 7/8 inches x 3 1/4 inches - pack of two

Med-Dyne brand disposable ultra-fine filters that are used by the older-style Respironics Duet LX, Bipap Pro, Synchrony, Synchrony-ST, and Harmony machines. These are exact replacements for Respironics part number 622220. These measure 4 7/8 X 3 1/4 inches. Two filters per pack.