Section 658-111-4 - Interconnection1. Gas utilization appliances and appliances burning liquid fuels may be connected to one chimney flue through separate openings or may be connected through a single opening if joined by a suitable fitting located as close as practical to the chimney provided. (Refer to NFPA #211, see Chapter 107)2. The interconnection of oil and solid fuel-burning equipment is not acceptable unless the equipment is specifically listed for such connections.02-658 C.M.R. ch. 111, § 4