---
kind: "section"
citation: "40 C.F.R. § 63.2455"
title: "40"
number: "63.2455"
heading: "What requirements must I meet for continuous process vents?"
url: "https://uscodex.org/cfr/40/63.2455"
---

# §63.2455. What requirements must I meet for continuous process vents?

- (a) You must meet each emission limit in Table 1 to this subpart that applies to your continuous process vents, and you must meet each applicable requirement specified in [paragraphs (b) through (c)](#b..c) of this section and §§ [63.2492](/cfr/40/63.2492.md) and [63.2493(a) through (c)](/cfr/40/63.2493.md?p=a..c).
- (b) For each continuous process vent, you must either designate the vent as a Group 1 continuous process vent or determine the total resource effectiveness (TRE) index value as specified in [§ 63.115(d)](/cfr/40/63.115.md?p=d), except as specified in [paragraphs (b)(1) through (3)](#b-1..b-3) of this section.
  - (1) You are not required to determine the Group status or the TRE index value for any continuous process vent that is combined with Group 1 batch process vents before a control device or recovery device because the requirements of [§ 63.2450(c)(2)(i)](/cfr/40/63.2450.md?p=c-2-i) apply to the combined stream.
  - (2) When a TRE index value of 4.0 is referred to in [§ 63.115(d)](/cfr/40/63.115.md?p=d), TRE index values of 5.0 for existing affected sources and 8.0 for new and reconstructed affected sources apply for the purposes of this subpart.
  - (3) When [§ 63.115(d)](/cfr/40/63.115.md?p=d) refers to “emission reductions specified in [§ 63.113(a)](/cfr/40/63.113.md?p=a),” the reductions specified in Table 1 to this subpart apply for the purposes of this subpart.
- (c) If you use a recovery device to maintain the TRE above a specified threshold, you must meet the requirements of [§ 63.982(e)](/cfr/40/63.982.md?p=e) and the requirements referenced therein, except as specified in [§ 63.2450](/cfr/40/63.2450.md) and [paragraph (c)(1)](#c-1) of this section.
  - (1) When [§ 63.993](/cfr/40/63.993.md) uses the phrase “the TRE index value is between the level specified in a referencing subpart and 4.0,” the phrase “the TRE index value is >1.9 but ≤5.0” applies for an existing affected source, and the phrase “the TRE index value is >5.0 but ≤8.0” applies for a new and reconstructed affected source, for the purposes of this subpart.
  - (2) [Reserved]

## Notes

### Amendments

[68 FR 63888, Nov. 10, 2003, as amended at 85 FR 49139, Aug. 12, 2020]

### Source

Source: 68 FR 63888, Nov. 10, 2003, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[68 FR 63888, Nov. 10, 2003, as amended at 85 FR 49139, Aug. 12, 2020]