Industrial/Commercial/Institutional Boilers
and Process Heaters NESHAP Summary
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1. What Type Units Are Affected by the Final Boiler MACT
Rule?
 The final rule affects industrial, institutional and commercial
boilers, and process heaters. They can be found in a wide
variety of facilities. Under the final rule, boiler means
an enclosed device using controlled flame combustion and
having the primary purpose of recovering thermal energy
in the form of steam or hot water.
In the final rule, process heater means an enclosed device
using controlled flame, that is not a boiler, and the unit's
primary purpose is to transfer heat indirectly to a process
material (liquid, gas, or solid) or to heat a transfer
material for use in a process unit, instead of generating
steam. Process heaters are devices in which the combustion
gases do not directly come into contact with process materials.
In the final rule, the affected source is defined as follows:
- The collection of all existing industrial, commercial,
or institutional boilers and process heaters within a
subcategory located at a major source; or
- Each new or reconstructed industrial, commercial or
institutional boiler and process heater located at a major
source.
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