# Industrial, Commercial and Institutional Boilers and Process Heaters (major sources) — EPA NESHAP Source Category Applicability Crosswalk

For Industrial, Commercial and Institutional Boilers and Process Heaters (major sources), cfr subpart is 40 CFR 63 Subpart DDDDD; source type is major sources; epa category url is https://www.epa.gov/stationary-sources-air-pollution/industrial-commercial-and-institutional-boilers-and-process-0, recorded from its source on 2026-08-15.

- **source category:** Industrial, Commercial and Institutional Boilers and Process Heaters (major sources) _(verified: appears in the quote below)_
- **cfr subpart:** 40 CFR 63 Subpart DDDDD _(verified: appears in the quote below)_
- **source type:** major sources _(our reading, not quoted from the source)_
- **epa category url:** https://www.epa.gov/stationary-sources-air-pollution/industrial-commercial-and-institutional-boilers-and-process-0 _(our reading, not quoted from the source)_

## What the source says

> Industrial, Commercial and Institutional Boilers and Process Heaters (major sources) | 40 CFR 63 Subpart DDDDD

## Source

- https://www.epa.gov/stationary-sources-air-pollution/national-emission-standards-hazardous-air-pollutants-neshap-8

Last verified: 2026-08-15. Review by: 2026-12-13.
Part of [EPA NESHAP Source Category Applicability Crosswalk](https://referencesource.org/neshap-source-category-crosswalk/).