40 CFR Part 63, Table 1B

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗

For each of the following process units . . .	You must comply with one of the following six compliance options by using an emissions control system . . .
Fiberboard mat dryer heated zones (at new affected sources only); green rotary dryers; hardboard ovens; press predryers (at new affected sources only); pressurized refiners; primary tube dryers; secondary tube dryers; reconstituted wood product board coolers (at new affected sources only); reconstituted wood product presses; softwood veneer dryer heated zones; rotary strand dryers; conveyor strand dryer zone one (at existing affected sources); and conveyor strand dryer zones one and two (at new affected sources)	(1) Reduce emissions of total HAP, measured as THC (as carbon) a, by 90 percent; or(2) Limit emissions of total HAP, measured as THC (as carbon) a, to 20 ppmvd; or(3) Reduce methanol emissions by 90 percent; or(4) Limit methanol emissions to less than or equal to 1 ppmvd if uncontrolled methanol emissions entering the control device are greater than or equal to 10 ppmvd; or(5) Reduce formaldehyde emissions by 90 percent; or(6) Limit formaldehyde emissions to less than or equal to 1 ppmvd if uncontrolled formaldehyde emissions entering the control device are greater than or equal to 10 ppmvd.

For each of the following process units . . .

You must comply with one of the following six compliance options by using an emissions control system . . .

Fiberboard mat dryer heated zones (at new affected sources only); green rotary dryers; hardboard ovens; press predryers (at new affected sources only); pressurized refiners; primary tube dryers; secondary tube dryers; reconstituted wood product board coolers (at new affected sources only); reconstituted wood product presses; softwood veneer dryer heated zones; rotary strand dryers; conveyor strand dryer zone one (at existing affected sources); and conveyor strand dryer zones one and two (at new affected sources)

(1) Reduce emissions of total HAP, measured as THC (as carbon) a, by 90 percent; or(2) Limit emissions of total HAP, measured as THC (as carbon) a, to 20 ppmvd; or(3) Reduce methanol emissions by 90 percent; or(4) Limit methanol emissions to less than or equal to 1 ppmvd if uncontrolled methanol emissions entering the control device are greater than or equal to 10 ppmvd; or(5) Reduce formaldehyde emissions by 90 percent; or(6) Limit formaldehyde emissions to less than or equal to 1 ppmvd if uncontrolled formaldehyde emissions entering the control device are greater than or equal to 10 ppmvd.

a You may choose to subtract methane from THC as carbon measurements.