A method of controlling fluid flow to a stack of fuel cell flow field
plates comprises providing in each fuel cell flow field plate of the
stack of plates a fluid supply manifold aperture for conducting a supply
of fluid to a number of the plates in the stack, the fluid supply
manifold apertures forming an elongated fluid supply manifold extending
through the stack, flowing the supply of fluid into the fluid supply
manifold and laterally diverting a part of the supply of fluid to feed
each of the number of the plates. The plates are each fed in parallel
from the fluid supply manifold, and the laterally diverting is performed
in a manner to avoid turbulence in the fluid supply manifold from
adversely affecting supply of fluid to downstream ones of the number of
plates.