 technical assistance to ensure that major sourcesLearn More Boiler MACT Technical Assistance Industrial, Commercial, and Institutional Boilers and Process Heaters (known as Boiler Maximum Achievable Control Technology (MACT)), in Spring 0000. This rule applies to large and small boil-ers in a wide range of industrial facilities and institutions. The U.S. Department of Energy (DOE) will offer technical assistance to ensure that major sourcesLearn More Industrial, Commercial, and Institutional Boilers and 