---
kind: "section"
citation: "40 C.F.R. § 63.3554"
title: "40"
number: "63.3554"
heading: "How do I determine the emission capture system efficiency?"
url: "https://uscodex.org/cfr/40/63.3554"
---

# §63.3554. How do I determine the emission capture system efficiency?


The capture efficiency of your emission capture system must be 100 percent to use the control efficiency/outlet concentration option. You may assume the capture system efficiency is 100 percent if both of the conditions in paragraphs [(a)](#a) and [(b)](#b) of this section are met.

- (a) The capture system meets the criteria in Method 204 of appendix M to [40 CFR part 51](/cfr/40/part51.md) for a PTE and directs all the exhaust gases from the enclosure to an add-on control device.
- (b) All coatings and thinners used in the coating operation are applied within the capture system, and coating solvent flash-off, curing, and drying occurs within the capture system. This criterion is not met if parts enter the open shop environment when being moved between a spray booth and a curing oven.

## Notes

### Source

Source: 68 FR 64446, Nov. 13, 2003, unless otherwise noted.

### Authority

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

### Source

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