Cytochrome P450 monooxygenase; part of the gene cluster that mediates the biosynthesis fumihopaside A, a hopane-type glucoside that enhances the thermotolerance and UV resistance of N.fumigata (PubMed:30977375). The first step of fumihopaside A biosynthesis is performed by the squalene hopane cyclase afumA that catalyzes the cyclization of 3S-oxidosqualene into the hopene 21-beta-H-hopane-3-beta,22-diol (PubMed:30977375). The cytochrome P450 monooxygenase afumB is responsible for both hydroxylation at C-24 and oxidations at C-30 of the afumA product (PubMed:30977375). The glycosyltransferase afumC then catalyzes the glycosylation at C-24, using UDP-D-glucose as a donor, to produce fumihopaside A (PubMed:30977375). AfumC is also able to accept UDP-D-galactose and UDP-D-glucuronic acid as donors to yield minor derivatives (PubMed:30977375). Fumihopaside B, another minor derivative produced, is different from fumihopaside A due to the presence of a double bond between C-22 and C-29 (PubMed:30977375). Secondary metabolite biosynthesis. Fails to produce fumihopaside A, but leads to the accumulation of 21-beta-H-hopane-3-beta,22-diol. Belongs to the cytochrome P450 family.