40 CFR § 63.5885 - How do I calculate percent reduction to demonstrate compliance for continuous lamination/casting operations?

---
identifier: "/us/cfr/t40/s63.5885"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 63.5885 - How do I calculate percent reduction to demonstrate compliance for continuous lamination/casting operations?"
title_number: 40
title_name: "Protection of Environment"
section_number: "63.5885"
section_name: "How do I calculate percent reduction to demonstrate compliance for continuous lamination/casting operations?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "63"
part_name: "NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "57 FR 61992, Dec. 29, 1992, unless otherwise noted."
cfr_part: "63"
---


# 63.5885 How do I calculate percent reduction to demonstrate compliance for continuous lamination/casting operations?

You may calculate percent reduction using any of the methods in paragraphs (a) through (d) of this section.

(a) *Compliant line option.* If all of your wet-out areas have PTE that meet the requirements of EPA Method 204 of appendix M of 40 CFR part 51, and all of your wet-out area organic HAP emissions and oven organic HAP emissions are vented to an add-on control device, use Equation 1 of this section to demonstrate compliance. In all other situations, use Equation 2 of this section to demonstrate compliance.

Where:

PR = percent reduction;

Inlet + HAP emissions entering the control device, lbs per year;

Outlet = HAP emissions existing the control device to the atmosphere, lbs per year.

Where:

PR = percent reduction;

WAEi<sub>ci</sub> = wet-out area organic HAP emissions, lbs per year, vented to a control device;

WAEi<sub>u</sub> = wet-out area organic HAP emissions, lbs per year, not vented to a control device;

Oj<sub>u</sub> = oven organic HAP emissions, lbs per year, not vented to a control device;

Oj<sub>ci</sub> = oven organic HAP emissions, lbs per year, vented to a control device;

WAEi<sub>co</sub> = wet-out area organic HAP emissions, lbs per year, from the control device outlet;

Oj<sub>co</sub> = oven organic HAP emissions, lbs per year, from the control device outlet.

(b) *Averaging option.* Use Equation 3 of this section to calculate percent reduction.

Where:

PR = percent reduction;

WAEi<sub>ci</sub> = wet-out area organic HAP emissions from wet-out area i, lbs per year, sent to a control device;

WAEi<sub>u</sub> = wet-out area organic HAP emissions from wet-out area i, lbs per year, not sent to a control device;

WAEi<sub>co</sub> = wet-out area organic HAP emissions from wet-out area i, lbs per year, at the outlet of a control device;

Oj<sub>u</sub> = organic HAP emissions from oven j, lbs per year, not sent to a control device;

Oj<sub>ci</sub> = organic HAP emissions from oven j, lbs per year, sent to a control device;

Oj<sub>co</sub> = organic HAP emissions from oven j, lbs per year, at the outlet of the control device;

m = number of wet-out areas;

n = number of ovens.

(c) *Add-on control device option.* Use Equation 1 of this section to calculate percent reduction.

(d) *Combination option.* Use Equations 1 through 3 of this section, as applicable, to calculate percent reduction.

[70 FR 50127, Aug. 25, 2005]