MFS-type efflux transporter; part of the gene cluster that mediates the biosynthesis of thethe mycotoxins phomacins, leucine-derived cytochalasans with potent actin polymerization-inhibitory activities and monocot-specific antigerminative activities (PubMed:31815421). PhmH might be involved in the excretion of phomacins (Probable). Belongs to the major facilitator superfamily.