US lawMassachusettsRegulations522 CMR — Board of Boiler Rules522 CMR 4.00 — Heating boilers and other heat storage sources4.04522 CMR 4.04InstallationYear: 2026Length: 19 wordsOfficial source In accordance with the provisions of M.G.L. c. 146, § 2, the Board adopts 2021 NBIC Part 1 Installation.Previous522 CMR 4.03Next522 CMR 4.05