---
kind: "section"
citation: "40 C.F.R. § 63.11393"
title: "40"
number: "63.11393"
heading: "Am I subject to this subpart?"
url: "https://uscodex.org/cfr/40/63.11393"
---

# §63.11393. Am I subject to this subpart?

- (a) You are subject to this subpart if you own or operate an acrylic or modacrylic fibers production plant that is an area source of hazardous air pollutant (HAP) emissions.
- (b) This subpart applies to each new or existing affected source. The affected source is each acrylic or modacrylic fibers plant.
  - (1) An affected source is existing if you commenced construction or reconstruction of the affected source on or before April 4, 2007.
  - (2) An affected source is new if you commenced construction or reconstruction of the affected source after April 4, 2007.
- (c) This subpart does not apply to research and development facilities, as defined in section 112(c)(7) of the Clean Air Act (CAA).
- (d) You are exempt from the obligation to obtain a permit under 40 CFR part [70](/cfr/40/part70.md) or [40](/cfr/40/part40.md) CFR [part 71](/cfr/40/part71.md), provided you are not otherwise required by law to obtain a permit under 40 CFR [70.3(a)](/cfr/40/70.3.md?p=a) or [40](/cfr/40/40.md) CFR 71.3(a). Notwithstanding the previous sentence, you must continue to comply with the provisions of this subpart.

## Notes

### Source

Source: 72 FR 38899, July 16, 2007, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.