Regulations last checked for updates: Jul 11, 2026

Title 40 - Protection of Environment last revised: Aug 11, 2026
All TitlesTitle 40Chapter IPart 63Subpart DDDDAppendix - Table 1D to Subpart DDDD of Part 63—Compliance Options Applicable On and After July 6, 2029, for Direct Wood-Fired PCWP Dryers at Affected Sources That Commenced Construction or Reconstruction On or Before May 18, 2023
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Appendix - Table 1D to Subpart DDDD of Part 63—Compliance Options Applicable On and After July 6, 2029, for Direct Wood-Fired PCWP Dryers at Affected Sources That Commenced Construction or Reconstruction On or Before May 18, 2023

Table 1D to Subpart DDDD of Part 63—Compliance Options Applicable On and After July 6, 2029, for Direct Wood-Fired PCWP Dryers at Affected Sources That Commenced Construction or Reconstruction On or Before May 18, 2023

For the following types of direct wood-fired PCWP dryers . . . You must meet the PM
(HAP metal) limit 		You must meet the Hg limit You must meet the HCl limit You must meet the PAH limit
Rotary strand dryer9.9E-02 lb/ODT or 3.6E-03 gr/dscf1.7E-05 lb/ODT or 8.4E-04 mg/dscm5.8E-03 lb/ODT or 1.5E-01 mg/dscm1.1E-04 lb/ODT or 9.9E-03 mg/dscm.
Green rotary dryer2.9E-01 lb/ODT or 5.2E-03 gr/dscf1.5E-05 lb/ODT or 1.3E-03 mg/dscm1.1E-02 lb/ODT or 1.7 mg/dscm3.2E-04 lb/ODT or 4.2E-02 mg/dscm.
Dry rotary dryer6.5E-01 lb/ODT or 9.8E-02 gr/dscf1.0E-05 lb/ODT or 8.4E-04 mg/dscm1.1E-03 lb/ODT or 9.0E-02 mg/dscm4.6E-05 lb/ODT or 4.1E-03 mg/dscm.
Primary tube dryer or secondary tube dryer3.1E-01 lb/ODT or 3.1E-03 gr/dscf3.9E-05 lb/ODT or 1.6E-03 mg/dscm6.4E-03 lb/ODT or 7.4E-01 mg/dscm3.0E-04 lb/ODT or 1.6E-03 mg/dscm.
Softwood veneer dryer heated zones7.2E-02 lb/MSF 3/8″ or 1.5E-02 gr/dscf5.8E-05 lb/MSF 3/8″ or 4.1E-02 mg/dscmNANA.

Notes: lb/ODT = pounds per oven dried ton, gr/dscf = grains per dry standard cubic foot, mg/dscm = milligrams per dry standard cubic meter. See § 63.2240(d)(3) for dioxin and furan TEQ limit for direct wood-fired green rotary dryers.

[91 FR 41451, July 6, 2026]
authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.
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