  We study the strongly connected components of the flow graph associated to a
veering triangulation, and show that the infinitesimal components must be of a
certain form, which have to do with subsets of the triangulation which we call
`walls'. We show two applications of this knowledge: (1) a fix of a proof in
the original paper by the first author which introduced veering triangulations;
and (2) an alternate proof that veering triangulations induce pseudo-Anosov
flows without perfect fits, which was initially proved by Schleimer and
Segerman.
