---
kind: "section"
citation: "40 C.F.R. § 63.1408"
title: "40"
number: "63.1408"
heading: "Aggregate batch vent stream provisions."
url: "https://uscodex.org/cfr/40/63.1408"
---

# §63.1408. Aggregate batch vent stream provisions.

- (a) **Emission standards.** Owners or operators of aggregate batch vent streams at a new or existing affected source shall comply with either paragraph [(a)(1)](#a-1) or [(2)](#a-2) of this section, as appropriate. As an alternative to complying with paragraph [(a)(1)](#a-1) or [(2)](#a-2) of this section, an owner or operator may comply with [paragraph (b)](#b) of this section.
  - (1) **The owner or operator of an aggregate batch vent stream located at a new affected source shall—**
    - (i) Vent all emissions of organic HAP to a flare; or
    - (ii) Reduce organic HAP emissions by 95 weight percent or to a concentration of 20 ppmv when using a combustion control device or to a concentration of 50 ppmv when using a non-combustion control device, whichever is less stringent, on a continuous basis.
  - (2) **The owner or operator of an aggregate batch vent stream located at an existing affected source shall—**
    - (i) Vent all emissions of organic HAP to a flare; or
    - (ii) Reduce organic HAP emissions by 83 weight percent or to a concentration of 20 ppmv when using a combustion control device or to a concentration of 50 ppmv when using a non-combustion control device, whichever is less stringent, on a continuous basis.
- (b) **Alternative standard.** Comply with either paragraph [(b)(1)](#b-1) or [(2)](#b-2) of this section.
  - (1) **Control device outlet concentration.** Vent all organic HAP emissions from an aggregate batch vent stream to a combustion control device achieving an outlet organic HAP concentration of 20 ppmv or less or to a non-combustion control device achieving an outlet organic HAP concentration of 50 ppmv or less. Any aggregate batch vent streams that are not vented to a control device meeting these conditions shall be controlled in accordance with the provisions of paragraphs [(a)(1)](#a-1) or [(a)(2)](#a-2) of this section.
  - (2) **Mass emission limit.** Include the emissions from all aggregate batch vent streams in the compliance demonstration required for reactor batch process vents complying with the mass emission limits specified in § [63.1406(a)(1)(iii)](/cfr/40/63.1406.md?p=a-1-iii) and [(a)(2)(iii)](/cfr/40/63.1406.md?p=a-2-iii), as appropriate. This compliance option may only be used when the owner or operator has elected to comply with the mass emission limit for reactor batch process vents.

## Notes

### Source

Source: 65 FR 3290, Jan. 20, 2000, unless otherwise noted.

### Authority

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

### Source

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