The fuel cell block has stacked elements. At least two adjacent elements define
an intermediate space between them. Radial channels are formed between the two
elements or in one of the elements. The radial channels connect the space to an
axial channel through the stack. At least one of the radial channels is a blind
channel which, in contrast with the other radial channels, does not allow fluid
communication between the space and the axial channel. The number of radial channels
that are configured as blind channels influences the quantity of operating medium
flowing through the intermediate space.