Involved in the transformation of 5-formyl tetrahydromethanopterin (5-formyl-H(4)MPT) to methanofuran (MFR) and formate via the formylmethanofuran (formyl-MFR). One-carbon metabolism; formaldehyde degradation; formate from formaldehyde (H(4)MPT route): step 4/5. Octaheteromer. Part of the formyltransferase/hydrolase complex fhc; composed of FhcA, FhcB, FhcC and FhcD. Although FhcB and FhcC do not possess a formylMFR dehydrogenase (Fmd) activity and have an unknown function, they are required for the stability of the complex.