Fluid space device for a reaction unit of a redox device

The invention relates to a fluid chamber device for a reaction unit of a redox device, with at least one first wall element (16a, 18a; 16b) and at least one second wall element (20a, 22a; 22b) which at least partially delimit a fluid chamber (24a, 26a; 24b), and with a sealing region (28a; 28b) which closes off the fluid chamber (24a, 26a; 24b) against fluid exchange, in particular gas exchange, with respect to an ambient space (30a; 30b). [0002] It is proposed that at least one of the wall elements (16a, 18a, 20a, 22a; 16b, 20b) in an assembled state has at least one sealing contour (32a, 34a; 32b) in the sealing region (28a; 28b), which is provided to provide a sealing effect and by means of which a spacing of the at least two wall elements (16a, 18a, 20a, 22a; 16b, 20b) in the sealing region (28a; 28b) is reduced compared to an ambient region of the sealing region (28a; 28b).