Boilers and Process Heaters: virtual tour

Affected Sources

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The three categories of combustion devices affected under the boiler MACT are industrial boilers, commercial and institutional (ICI) boilers, and process heaters. Although their primary function is to transfer heat generated from fuel combustion to materials used in the production process, the applications for boilers and process heaters are somewhat different. As a result, the primary industries using boilers may not be the same as those using process heaters.

There are industries in 43 2-digit Standard Industrial Classification (SIC) codes and 3-digit North American Industrial Classification System (NAICS) that are affected by the rule.  Below is a list of industrial types that could be potentially affected by the boiler MACT.  Other types of entities not listed could also be affected by the rule.

Industrial types potentially affected by the boiler MACT

Category	NAICS Code	SICS Code	Examples of Potentially Regulated Entities
Any industry using a boiler or process heater as defined in the final rule.	211 321 322 325 324 316, 326, 339 331 332 336 221 622 611	13 24 26 28 29 30 33 34 37 49 80 82	Extractors of crude petroleum and natural gas. Manufacturers of lumber and wood products. Pulp and paper mills. Chemical manufacturers. Petroeum refineries and manufacturers of coal products. Manufacturers of rubber and miscellaneous plastic products. Steel works, blast furnaces. Electroplating, plating, polishing, anodixing, and coloring. Manufacturers of motor vehicle parts and accessories. Electric, gas, and sanitary services. Health services. Educational services.

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