Catalyzes the hydrolysis of epoxide-containing fatty acids. Active in vitro against trans-1,3-diphenylpropene oxide (t-DPPO), epoxyeicosatrienoic acids (EETs) including 8,9-EET, 11,12-EET and 14,15-EET and the linoleic acid metabolites 12,13-epoxy-9-octadecenoate (12,13-EpOME) and 9,10-epoxy-12-octadecenoate (9,10-EpOME). an epoxide + H2O = an ethanediol Lipid metabolism. RNAi knockdown of both ceeh-1 and ceeh-2 results in the accumulation of 9,10-EpOME and 12,13-EpOME. Less active when compared to ceeh-1. Belongs to the AB hydrolase superfamily. Epoxide hydrolase family.