{"data":{"id":"us/40-cfr-table-2-to-subpart-ffff-of-part-63","jurisdiction":"us","citation":"40 CFR Table 2 to Subpart FFFF of Part 63","heading":"Table 2 to Subpart FFFF of Part 63—Emission Limits and Work Practice Standards for Batch Process Vents","body":"As required in § 63.2460, you must meet each emission limit and work practice standard in the following table that applies to your batch process vents:\nFor each . . . Then you must . . . And you must . . .\n1. Process with Group 1 batch process vents a. Reduce collective uncontrolled organic HAP emissions from the sum of all batch process vents within the process by ≥98 percent by weight by venting emissions from a sufficient number of the vents through one or more closed-vent systems to any combination of control devices (except a flare); or Not applicable.\nb. Reduce collective uncontrolled organic HAP emissions from the sum of all batch process vents within the process by ≥95 percent by weight by venting emissions from a sufficient number of the vents through one or more closed-vent systems to any combination of recovery devices or a biofilter, except you may elect to comply with the requirements of subpart WW of this part for any process tank; or Not applicable.\nc. Reduce uncontrolled organic HAP emissions from one or more batch process vents within the process by venting through a closed-vent system to a flare or by venting through one or more closed-vent systems to any combination of control devices (excluding a flare) that reduce organic HAP to an outlet concentration ≤20 ppmv as TOC or total organic HAP For all other batch process vents within the process, reduce collective organic HAP emissions as specified in item 1.a and/or item 1.b of this Table.\n2. Halogenated Group 1 batch process vent for which you use a combustion device to control organic HAP emissions a. Use a halogen reduction device after the combustion control device; or i. Reduce overall emissions of hydrogen halide and halogen HAP by ≥99 percent; or ii. Reduce overall emissions of hydrogen halide and halogen HAP to ≤0.45 kg/hr; or iii. Reduce overall emissions of hydrogen halide and halogen HAP to a concentration ≤20 ppmv.\nb. Use a halogen reduction device before the combustion control device Reduce the halogen atom mass emission rate to ≤0.45 kg/hr or to a concentration ≤20 ppmv.\n3. Batch process vent that contains ethylene oxide such that it is considered to be in ethylene oxide service as defined in § 63.2550 Beginning no later than the compliance dates specified in § 63.2445(i), comply with the applicable emission limits specified in items 1 and 2 of this Table, and also: i. Reduce emissions of ethylene oxide by venting emissions through a closed-vent system to a flare; or ii. Reduce emissions of ethylene oxide by venting emissions through a closed-vent system to a control device that reduces ethylene oxide by ≥99.9 percent by weight, or to a concentration \u003c1 ppmv for each process vent or to \u003c5 pounds per year for all combined process vents. Not applicable.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES","Subpart FFFF—National Emission Standards for Hazardous Air Pollutants: Miscellaneous Organic Chemical Manufacturing"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"9967e1207eff5d7ab3dc0c3d4e8f80e05ad761c81c346a3679d342a993dbe418","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-table-1-to-subpart-ffff-of-part-63","next":"us/40-cfr-table-3-to-subpart-ffff-of-part-63"},"notice":"GroundRules: Original legal text. Not legal advice."}