---
kind: "section"
citation: "40 C.F.R. § 63.2984"
title: "40"
number: "63.2984"
heading: "What operating limits must I meet?"
url: "https://uscodex.org/cfr/40/63.2984"
---

# §63.2984. What operating limits must I meet?

- (a) You must maintain operating parameters within established limits or ranges specified in your operation, maintenance, and monitoring (OMM) plan described in [§ 63.2987](/cfr/40/63.2987.md). If there is a deviation of any of the specified parameters from the limit or range specified in the OMM plan, you must address the deviation according to [paragraph (b)](#b) of this section. You must comply with the operating limits specified in [paragraphs (a)(1) through (4)](#a-1..a-4) of this section:
  - (1) You must operate the thermal oxidizer so that the average operating temperature in any 3-hour block period does not fall below the temperature established during your performance test and specified in your OMM plan, except during periods when using a non-HAP binder.
  - (2) You must not use a resin with a free-formaldehyde content greater than that of the resin used during your performance test and specified in your OMM plan.
  - (3) You must operate the wet-formed fiberglass mat production process so that the average urea formaldehyde resin solids application rate in any 3-hour block period does not exceed the average application rate achieved during your performance test and specified in your OMM plan.
  - (4) If you use an add-on control device other than a thermal oxidizer or wish to monitor an alternative parameter and comply with a different operating limit than the limit specified in [paragraph (a)(1)](#a-1) of this section, you must obtain approval for the alternative monitoring under [§ 63.8(f)](/cfr/40/63.8.md?p=f). You must include the approved alternative monitoring and operating limits in the OMM plan specified in [§ 63.2987](/cfr/40/63.2987.md).
- (b) When during a period of normal operation, you detect that an operating parameter deviates from the limit or range established in [paragraph (a)](#a) of this section, you must initiate corrective actions within 1 hour according to the provisions of your OMM plan. The corrective actions must be completed in an expeditious manner as specified in the OMM plan.
- (c) You must maintain and inspect control devices according to the procedures specified in the OMM plan.
- (d) You must include the operating limits specified in [paragraphs (a)(1) through (4)](#a-1..a-4) of this section and their allowable ranges or levels in your OMM plan. Your [40 CFR part 70](/cfr/40/part70.md) operating permit for the drying and curing oven must contain a requirement that you develop and operate according to an OMM plan at all times.
- (e) If you use a thermal oxidizer or other control device to achieve the emission limits in [§ 63.2983](/cfr/40/63.2983.md), you must capture and convey the formaldehyde emissions from each drying and curing oven according to the procedures in Chapters 3 and 5 of “Industrial Ventilation: A Manual of Recommended Practice” (23rd Edition) or the appropriate chapters of “Industrial Ventilation: A Manual of Recommended Practice for Design” (27th Edition) (both are incorporated by reference, see [§ 63.14](/cfr/40/63.14.md)). In addition, you may use an alternate as approved by the Administrator.

## Notes

### Amendments

[67 FR 17835, Apr. 11, 2002, as amended at 71 FR 20464, Apr. 20, 2006; 84 FR 6692, Feb. 28, 2019]

### Source

Source: 67 FR 17835, Apr. 11, 2002, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[67 FR 17835, Apr. 11, 2002, as amended at 71 FR 20464, Apr. 20, 2006; 84 FR 6692, Feb. 28, 2019]