Abstract: A regenerative energy and/or mass exchange assembly having an exchange media, a central housing, a first end housing with fluid stream diverting chambers to provide a fluid flow passage from a first inlet of the first end housing to the exchange media, and provide a fluid flow passage from the exchange media to a first outlet of the first end housing, a second end housing having fluid stream diverting chambers to provide a fluid flow passage from a second inlet of the second end housing to the exchange media, and provide a fluid flow passage from the exchange media to a second outlet of the second end housing. The first and second end housings have a skirt portion extending generally parallel to a central axis of the end housings. The exchange media is rotated by a motor via a shaft, and the shaft is fastened to a recess in a side surface of the exchange media by a drive transfer means.