  Given a C*-algebra B which is graded over a discrete group G we consider
ideals of B which are invariant under the projections onto each of the grading
subspaces. If G is exact and the standard conditional expectation of B is
faithful we show that all such ideals are induced, i.e. are generated by their
intersection with the unit fiber algebra. This result is derived from a
generalization to the context of Fell bundles of a Theorem by Kirchberg and
Wasserman according to which a group is exact if and only if its reduced
C*-algebra is exact.
