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Subpart NNN—National Emission Standards for Hazardous Air 

Pollutants for Wool Fiberglass Manufacturing 

Contents 

Subpart NNN—National Emission Standards for Hazardous Air 

Pollutants for Wool Fiberglass Manufacturing

§ 63.1380 Applicability.

§ 63.1381 Definitions.

§ 63.1382 Emission standards.

§ 63.1383 Monitoring requirements.

§ 63.1384 Performance test requirements.

§ 63.1385 Test methods and procedures.

§ 63.1386 Notification, recordkeeping, and reporting 

requirements.

§ 63.1387 Compliance dates.

§ 63.1388 Implementation and enforcement.

§§ 63.1389-63.1399 [Reserved]

Appendix A to Subpart NNN of Part 63—Method for the

Determination of LOI

Appendix B to Subpart NNN of Part 63—Free Formaldehyde Analysis 

of Insulation Resins by Hydroxylamine Hydrochloride

Appendix C to Subpart NNN of Part 63—Method for the

Determination of Product Density

§ 63.1380 Applicability. 

(a) Except as provided in paragraphs (b) and (c) of this 

section, the requirements of this subpart apply to the owner or 

operator of each wool fiberglass manufacturing facility that is 

a major source or is located at a facility that is a major 

source. 

(b) The requirements of this subpart apply to emissions of 

hazardous air pollutants (HAPs), as measured according to the 
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methods and procedures in this subpart, emitted from the 

following new and existing sources at a wool fiberglass 

manufacturing facility subject to this subpart: 

(1) Each new and existing glass-melting furnace located at 

a wool fiberglass manufacturing facility; 

(2) Each new and existing rotary spin wool fiberglass 

manufacturing line producing a bonded wool fiberglass building 

insulation product; and 

(3) Each new and existing flame attenuation wool fiberglass 

manufacturing line producing a bonded pipe product and each new 

flame attenuation wool fiberglass manufacturing line producing a 

bonded heavy-density product. 

(c) The requirements of this subpart do not apply to a wool 

fiberglass manufacturing facility that the owner or operator 

demonstrates to the Administrator is not a major source as 

defined in § 63.2. 

(d) The provisions of this part 63, subpart A that apply 

and those that do not apply to this subpart are specified in 

Table 1 of this subpart. 

§ 63.1381 Definitions. 

Terms used in this subpart are defined in the Clean Air 

Act, in § 63.2, or in this section as follows: 

Bag leak detection system means systems that include, but 

are not limited to, devices using triboelectric, light 
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scattering, and other effects to monitor relative or absolute 

particulate matter (PM) emissions. 

Bonded means wool fiberglass to which a phenol-formaldehyde 

binder has been applied. 

Building insulation means bonded wool fiberglass 

insulation, having a loss on ignition of less than 8 percent and 

a density of less than 32 kilograms per cubic meter (kg/m3) (2 

pounds per cubic foot [lb/ft3]). 

Cold top electric furnace means an all-electric glassmelting furnace that operates with a temperature of 120 °C (250 

°F) or less as measured at a location 46 to 61 centimeters (18 

to 24 inches) above the molten glass surface. 

Flame attenuation means a process used to produce wool 

fiberglass where molten glass flows by gravity from melting 

furnaces, or pots, to form filaments that are drawn down and 

attenuated by passing in front of a high-velocity gas burner 

flame.

Gas-fired glass-melting furnace means a unit comprising a 

refractory vessel in which raw materials are charged, melted at 

high temperature using natural gas and other fuels, refined, and 

conditioned to produce molten glass. The unit includes 

foundations, superstructure and retaining walls, raw material 

charger systems, heat exchangers, exhaust system, refractory 

brick work, fuel supply and electrical boosting equipment, 
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integral control systems and instrumentation, and appendages for 

conditioning and distributing molten glass to forming processes. 

The forming apparatus, including flow channels, is not 

considered part of the gas-fired glass-melting furnace. Cold-top 

electric glass-melting furnaces as defined in this subpart are 

not gas-fired glass-melting furnaces.

Glass-melting furnace means a unit comprising a refractory 

vessel in which raw materials are charged, melted at high 

temperature, refined, and conditioned to produce molten glass. 

The unit includes foundations, superstructure and retaining 

walls, raw material charger systems, heat exchangers, melter 

cooling system, exhaust system, refractory brick work, fuel 

supply and electrical boosting equipment, integral control 

systems and instrumentation, and appendages for conditioning and 

distributing molten glass to forming processes. The forming 

apparatus, including flow channels, is not considered part of 

the glass-melting furnace. 

Glass pull rate means the mass of molten glass that is 

produced by a single glass-melting furnace or that is used in 

the manufacture of wool fiberglass at a single manufacturing 

line in a specified time period. 

Hazardous Air Pollutant (HAP) means any air pollutant 

listed in or pursuant to section 112(b) of the Clean Air Act. 

Commented [JF1]: You have a definition for Cold-top 

electric furnace, not Cold-top electric glass-melting furnace. 
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Heavy-density product means bonded wool fiberglass 

insulation manufactured on a flame attenuation manufacturing 

line and having a loss on ignition of 11 to 25 percent and a 

density of 8 to 48 kg/m3 (0.5 to 3 lb/ft3). 

Incinerator means an enclosed air pollution control device 

that uses controlled flame combustion to convert combustible 

materials to noncombustible gases. For the purposes of this 

subpart, the term “incinerator” means “regenerative thermal 

oxidizer” (RTO).

Loss on ignition (LOI) means the percent decrease in weight 

of wool fiberglass after it has been ignited. The LOI is used to 

monitor the weight percent of binder in wool fiberglass. 

Manufacturing line means the manufacturing equipment for 

the production of wool fiberglass that consists of a forming 

section where molten glass is fiberized and a fiberglass mat is 

formed and which may include a curing section where binder resin 

in the mat is thermally set and a cooling section where the mat 

is cooled. 

New source means any affected source the construction or 

reconstruction of which is commenced after November 25, 

2011March 31, 1997. 

Pipe product means bonded wool fiberglass insulation 

manufactured on a flame attenuation manufacturing line and 

Commented [JF2]: RTO does not appear elsewhere in the 

rule text. 
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having a loss on ignition of 8 to 14 percent and a density of 48 

to 96 kg/m3 (3 to 6 lb/ft3). 

Rotary spin means a process used to produce wool fiberglass 

building insulation by forcing molten glass through numerous 

small orifices in the side wall of a spinner to form continuous 

glass fibers that are then broken into discrete lengths by highvelocity air flow. Any process used to produce bonded wool 

fiberglass building insulation by a process other than flame 

attenuation is considered rotary spin. 

Wool fiberglass means insulation materials composed of 

glass fibers made from glass produced or melted at the same 

facility where the manufacturing line is located. 

Wool fiberglass manufacturing facility means any facility 

manufacturing wool fiberglass on a rotary spin manufacturing 

line or on a flame attenuation manufacturing line. 

§ 63.1382 Emission standards. 

(a) Emission limits

(1) Glass-melting furnaces. On and after the date the 

initial performance test is completed or required to be 

completed under § 63.7, whichever date is earlier: 

(i) For each existing, new, or reconstructed glass-melting 

furnace you must not discharge or cause to be discharged into 

the atmosphere in excess of 0.33 pound (lb) of particulate 

matter (PM) per ton glass pulled; 
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(ii) For each existing, new, or reconstructed gas-fired 

glass-melting furnace, you must not discharge or cause to be 

discharged into the atmosphere in excess of 0.00025 lb of 

chromium (Cr) compounds per ton glass pulled (0.25 lb per 

thousand tons glass pulled). 

(iii) For each existing, new, or reconstructed gas-fired 

glass-melting furnace you must either: 

(A) Require cullet providers to provide records of their 

inspections showing that no glass from industrial (also known as 

continuous strand, or textile) fiberglass, cathode ray tubes 

(CRT), computer monitors that include CRT, and glass from 

microwave ovens, televisions or other electronics is included in 

the cullet; or 

(B) Sample your raw materials and maintain records of your 

sampling showing that the cullet is free of glass from 

industrial fiberglass, cathode ray tubes, computer monitors that 

include cathode ray tubes, and glass from microwave ovens, 

televisions or other electronics. 

(1) Glass-melting furnaces. On and after the date the 

initial performance test is completed or required to be 

completed under § 63.7 of this part, whichever date is earlier, 

the owner or operator shall not discharge or cause to be 

discharged into the atmosphere in excess of 0.25 kilogram (kg) 

of particulate matter (PM) per megagram (Mg) (0.5 pound [lb] of 
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PM per ton) of glass pulled for each new or existing glassmelting furnace.

(2) Rotary spin manufacturing lines. On and after the date 

the initial performance test is completed or required to be 

completed under § 63.7 of this part, whichever date is earlier, 

the owner or operator shall not discharge or cause to be 

discharged into the atmosphere in excess of: 

(i) 0.6 kg of formaldehyde per megagram (1.2 lb of 

formaldehyde per ton) of glass pulled for each existing rotary 

spin manufacturing line; and 

(ii) 0.4 kg of formaldehyde per megagram (0.8 lb of

formaldehyde per ton) of glass pulled for each new rotary spin 

manufacturing line. 

(3) Flame attenuation manufacturing lines. On and after the 

date the initial performance test is completed or required to be 

completed under § 63.7, whichever date is earlier, the owner or 

operator shall not discharge or cause to be discharged into the 

atmosphere in excess of: 

(i) For each existing flame attenuation (FA) manufacturing 

line, you must not discharge or cause to be discharged into the 

atmosphere in excess of: 

(A) 5.6 lb of formaldehyde per ton glass pulled; 

(B) 1.4 lb of phenol per ton glass pulled; and 

(C) 0.50 lb of methanol per ton glass pulled. 
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(ii) For each new or reconstructed FA manufacturing line 

you must not discharge or cause to be discharged into the 

atmosphere in excess of: 

(A) 2.6 lb of formaldehyde per ton glass pulled; 

(B) 0.44 lb of phenol per ton glass pulled; and 

(C) 0.35 lb of methanol per ton glass pulled. 

 (3) Flame attenuation manufacturing lines. On and after 

the date the initial performance test is completed or required 

to be completed under § 63.7 of this part, whichever date is 

earlier, the owner or operator shall not discharge or cause to 

be discharged into the atmosphere in excess of: 

(i) 3.9 kg of formaldehyde per megagram (7.8 lb of 

formaldehyde per ton) of glass pulled for each new flame 

attenuation manufacturing line that produces heavy-density wool 

fiberglass; and 

(ii) 3.4 kg of formaldehyde per megagram (6.8 lb of

formaldehyde per ton) of glass pulled from each existing or new 

flame attenuation manufacturing line that produces pipe product 

wool fiberglass. 

(b) Operating limits. On and after the date on which the 

performance test required to be conducted by §§ 63.7 and 63.1384 

is completed, the owner or operator must operate all affected 

control equipment and processes according to the following 

requirements. 
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(1)(i) The owner or operator must initiate corrective 

action within 1 hour of an alarm from a bag leak detection 

system and complete corrective actions in a timely manner 

according to the procedures in the operations, maintenance, and 

monitoring plan. 

(ii) The owner or operator must implement a Quality

Improvement Plan (QIP) consistent with the compliance assurance 

monitoring provisions of 40 CFR part 64, subpart D when the bag 

leak detection system alarm is sounded for more than 5 percent 

of the total operating time in a 6-month block reporting period. 

(2)(i) The owner or operator must initiate corrective 

action within 1 hour when any 3-hour block average of the 

monitored electrostatic precipitator (ESP) parameter is outside 

the limit(s) established during the performance test as 

specified in § 63.1384 and complete corrective actions in a 

timely manner according to the procedures in the operations, 

maintenance, and monitoring plan. 

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64 subpart D when the monitored ESP parameter is outside 

the limit(s) established during the performance test as 

specified in § 63.1384 for more than 5 percent of the total 

operating time in a 6-month block reporting period.
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(iii) The owner or operator must operate the ESP such that 

the monitored ESP parameter is not outside the limit(s) 

established during the performance test as specified in § 

63.1384 for more than 10 percent of the total operating time in 

a 6-month block reporting period. 

(3)(i) The owner or operator must initiate corrective 

action within 1 hour when any 3-hour block average temperature 

of a cold top electric furnace as measured at a location 46 to 

61 centimeters (18 to 24 inches) above the molten glass surface, 

exceeds 120 °C (250 °F) and complete corrective actions in a 

timely manner according to the procedures in the operations, 

maintenance, and monitoring plan. 

(ii) The owner or operator of a cold top electric furnace 

must implement a QIP consistent with the compliance assurance 

monitoring provisions of 40 CFR part 64, subpart D when the 

temperature, as measured at a location 46 to 61 centimeters (18 

to 24 inches) above the molten glass surface, exceeds 120 °C 

(250 °F) for more than 5 percent of the total operating time in 

a 6-month block reporting period. 

(iii) The owner or operator must operate the cold top 

electric furnace such that the temperature does not exceed 120 

°C (250 °F) as measured at a location 46 to 61 centimeters (18 

to 24 inches) above the molten glass surface, for more than 10 
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percent of the total operating time in a 6-month reporting 

period. 

(4)(i) The owner or operator must initiate corrective 

action within 1 hour when any 3-hour block average value for the 

monitored parameter(s) for a glass-melting furnace, which uses 

no add-on controls and which is not a cold top electric furnace, 

is outside the limit(s) established during the performance test 

as specified in § 63.1384 and complete corrective actions in a 

timely manner according to the procedures in the operations, 

maintenance, and monitoring plan. 

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64 subpart D when the monitored parameter(s) is outside the 

limit(s) established during the performance test as specified in 

§ 63.1384 for more than 5 percent of the total operating time in 

a 6-month block reporting period. 

(iii) The owner or operator must operate a glass-melting 

furnace, which uses no add-on controls and which is not a cold 

top electric furnace, such that the monitored parameter(s) is 

not outside the limit(s) established during the performance test 

as specified in § 63.1384 for more than 10 percent of the total 

operating time in a 6-month block reporting period.

(5)(i) The owner or operator must initiate corrective 

action within 1 hour when the average glass pull rate of any 4-
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hour block period for glass melting furnaces equipped with 

continuous glass pull rate monitors, or daily glass pull rate 

for glass melting furnaces not so equipped, exceeds the average 

glass pull rate established during the performance test as 

specified in § 63.1384, by greater than 20 percent and complete 

corrective actions in a timely manner according to the 

procedures in the operations, maintenance, and monitoring plan. 

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64, subpart D when the glass pull rate exceeds, by more 

than 20 percent, the average glass pull rate established during 

the performance test as specified in § 63.1384 for more than 5 

percent of the total operating time in a 6-month block reporting 

period. 

(iii) The owner or operator must operate each glass-melting 

furnace such that the glass pull rate does not exceed, by more 

than 20 percent, the average glass pull rate established during 

the performance test as specified in § 63.1384 for more than 10 

percent of the total operating time in a 6-month block reporting 

period. 

(6) The owner or operator must operate each incinerator 

used to control formaldehyde emissions from forming or curing 

such that any 3-hour block average temperature in the firebox 
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does not fall below the average established during the 

performance test as specified in § 63.1384. 

(7)(i) The owner or operator must initiate corrective 

action within 1 hour when the average pressure drop, liquid flow 

rate, or chemical feed rate for any 3-hour block period is 

outside the limits established during the performance tests as 

specified in § 63.1384 for each wet scrubbing control device and 

complete corrective actions in a timely manner according to the 

procedures in the operations, maintenance, and monitoring plan. 

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64, subpart D when any scrubber parameter is outside the 

limit(s) established during the performance test as specified in 

§ 63.1384 for more than 5 percent of the total operating time in 

a 6-month block reporting period. 

(iii) The owner or operator must operate each scrubber such 

that each monitored parameter is not outside the limit(s) 

established during the performance test as specified in § 

63.1384 for more than 10 percent of the total operating time in 

a 6-month block reporting period. 

(8)(i) The owner or operator must initiate corrective 

action within 1 hour when the monitored process parameter 

level(s) is outside the limit(s) established during the 

performance test as specified in § 63.1384 for the process 
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modification(s) used to control formaldehyde emissions and 

complete corrective actions in a timely manner according to the 

procedures in the operations, maintenance, and monitoring plan. 

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64, subpart D when the process parameter(s) is outside the 

limit(s) established during the performance test as specified in 

§ 63.1384 for more than 5 percent of the total operating time in 

a 6-month block reporting period. 

(iii) The owner or operator must operate the process 

modifications such that the monitored process parameter(s) is 

not outside the limit(s) established during the performance test 

as specified in § 63.1384 for more than 10 percent of the total 

operating time in a 6-month block reporting period.

(9) The owner or operator must use a resin in the 

formulation of binder such that the free-formaldehyde content of 

the resin used does not exceed the free-formaldehyde range 

contained in the specification for the resin used during the 

performance test as specified in § 63.1384. 

(10) The owner or operator must use a binder formulation 

that does not vary from the specification and operating range 

established and used during the performance test as specified in 

§ 63.1384. For the purposes of this standard, adding or 

increasing the quantity of urea and/or lignin in the binder 
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formulation does not constitute a change in the binder 

formulation.

(11) The owner or operator must maintain the percentage of 

cullet in the materials mix for each gas-fired glass-melting 

furnace at or below the level established during the performance 

test as specified in § 63.1384(a)(4).

§ 63.1383 Monitoring requirements. 

On and after the date on which the performance test

required to be conducted by §§ 63.7 and 63.1384 is completed, 

the owner or operator must monitor all affected control 

equipment and processes according to the following requirements. 

(a) The owner or operator of each wool fiberglass 

manufacturing facility must prepare for each glass-melting 

furnace, rotary spin manufacturing line, and flame attenuation 

manufacturing line subject to the provisions of this subpart, a 

written operations, maintenance, and monitoring plan. The plan 

must be submitted to the Administrator for review and approval 

as part of the application for a part 70 permit. The plan must 

include the following information: 

(1) Procedures for the proper operation and maintenance of 

process modifications and add-on control devices used to meet 

the emission limits in § 63.1382; 

(2) Procedures for the proper operation and maintenance of 

monitoring devices used to determine compliance, including 
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quarterly calibration and certification of accuracy of each 

monitoring device according to the manufacturers's instructions; 

and 

(3) Corrective actions to be taken when process parameters 

or add-on control device parameters deviate from the limit(s) 

established during initial performance tests. 

(b)(1) Where a baghouse is used to control PM emissions 

from a glass-melting furnace, the owner or operator shall 

install, calibrate, maintain, and continuously operate a bag 

leak detection system. 

(i) The bag leak detection system must be certified by the 

manufacturer to be capable of detecting PM emissions at 

concentrations of 10 milligrams per actual cubic meter (0.0044 

grains per actual cubic foot) or less. 

(ii) The bag leak detection system sensor must produce 

output of relative PM emissions. 

(iii) The bag leak detection system must be equipped with 

an alarm system that will sound automatically when an increase 

in relative PM emissions over a preset level is detected and the 

alarm must be located such that it can be heard by the 

appropriate plant personnel. 

(iv) For positive pressure fabric filter systems, a bag 

leak detection system must be installed in each baghouse 

compartment or cell. If a negative pressure or induced air 
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baghouse is used, the bag leak detection system must be 

installed downstream of the baghouse. Where multiple bag leak 

detection systems are required (for either type of baghouse), 

the system instrumentation and alarm may be shared among the 

monitors. 

(v) A triboelectric bag leak detection system shall be 

installed, operated, adjusted, and maintained in a manner 

consistent with the U.S. Environmental Protection Agency 

guidance, “Fabric Filter Bag Leak Detection Guidance” (EPA454/R-98-015, September 1997). Other bag leak detection systems 

shall be installed, operated, adjusted, and maintained in a 

manner consistent with the manufacturer's written specifications 

and recommendations. 

(vi) Initial adjustment of the system shall, at a minimum, 

consist of establishing the baseline output by adjusting the 

range and the averaging period of the device and establishing 

the alarm set points and the alarm delay time. 

(vii) Following the initial adjustment, the owner or 

operator shall not adjust the range, averaging period, alarm 

setpoints, or alarm delay time except as detailed in the 

approved operations, maintenance, and monitoring plan required 

under paragraph (a) of this section. In no event shall the range 

be increased by more than 100 percent or decreased more than 50 

percent over a 365-day period unless a responsible official as 
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defined in § 63.2 of the general provisions in subpart A of this 

part certifies that the baghouse has been inspected and found to 

be in good operating condition. 

(2) The operations, maintenance, and monitoring plan 

required by paragraph (a) of this section must specify 

corrective actions to be followed in the event of a bag leak 

detection system alarm. Example corrective actions that may be 

included in the plan include the following: 

(i) Inspecting the baghouse for air leaks, torn or broken 

bags or filter media, or any other conditions that may cause an 

increase in emissions. 

(ii) Sealing off defective bags or filter media. 

(iii) Replacing defective bags or filter media, or 

otherwise repairing the control device. 

(iv) Sealing off a defective baghouse compartment. 

(v) Cleaning the bag leak detection system probe, or 

otherwise repairing the bag leak detection system. 

(vi) Shutting down the process producing the particulate 

emissions. 

(c)(1) Where an ESP is used to control PM emissions from a 

glass-melting furnace, the owner or operator must monitor the 

ESP according to the procedures in the operations, maintenance, 

and monitoring plan. (2)The operations, maintenance, and 
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monitoring plan for the ESP must contain the following 

information: 

(i) The ESP operating parameter(s), such as secondary 

voltage of each electrical field, to be monitored and the 

minimum and/or maximum value(s) that will be used to identify 

any operational problems; 

(ii) A schedule for monitoring the ESP operating 

parameter(s); 

(iii) Recordkeeping procedures, consistent with the

recordkeeping requirements of § 63.1386, to show that the ESP 

operating parameter(s) is within the limit(s) established during 

the performance test; and 

(iv) Procedures for the proper operation and maintenance of 

the ESP. 

(d) The owner or operator must measure and record at least 

once per shift the temperature 46 to 61 centimeters (18 to 24 

inches) above the surface of the molten glass in a cold top 

electric furnace that does not use any add-on controls to 

control PM emissions. 

(e)(1) Where a glass-melting furnace is operated without an 

add-on control device to control PM emissions, the owner or 

operator must monitor the glass-melting furnace according to the 

procedures in the operations, maintenance, and monitoring plan. 
Page 21 of 65 

(2) The operations, maintenance, and monitoring plan for 

the glass-melting furnace must contain the following 

information: 

(i) The operating parameter(s) to be monitored and the 

minimum and/or maximum value(s) that will be used to identify 

any operational problems; 

(ii) A schedule for monitoring the operating parameter(s) 

of the glass-melting furnace; 

(iii) Recordkeeping procedures, consistent with the

recordkeeping requirements of § 63.1386, to show that the glassmelting furnace parameter(s) is within the limit(s) established 

during the performance test; and 

(iv) Procedures for the proper operation and maintenance of 

the glass-melting furnace. 

(f) The owner or operator who uses a control device to 

control HAP emissions from a glass-melting furnace, RS 

manufacturing line, or FA manufacturing line must install, 

calibrate, maintain, and operate a monitoring device that 

continuously measures an appropriate parameter that is 

correlated to the emission limit performance test.(f)(1) The 

owner or operator of an existing glass-melting furnace equipped 

with continuous glass pull rate monitors must monitor and record 

the glass pull rate on an hourly basis. For glass-melting 

furnaces that are not equipped with continuous glass pull rate 
Page 22 of 65 

monitors, the glass pull rate must be monitored and recorded 

once per day. 

(2) On any new glass-melting furnace, the owner or operator 

must install, calibrate, and maintain a continuous glass pull 

rate monitor that monitors and records on an hourly basis the 

glass pull rate.

(g)(1) The owner or operator who uses an incinerator to 

control formaldehyde emissions from forming or curing shall 

install, calibrate, maintain, and operate a monitoring device 

that continuously measures and records the operating temperature 

in the firebox of each incinerator. 

(2) The owner or operator must inspect each incinerator at 

least once per year according to the procedures in the 

operations, maintenance, and monitoring plan. At a minimum, an 

inspection must include the following: 

(i) Inspect all burners, pilot assemblies, and pilot 

sensing devices for proper operation and clean pilot sensor, as 

necessary; 

(ii) Ensure proper adjustment of combustion air and adjust, 

as necessary; 

(iii) Inspect, when possible, internal structures, for 

example, baffles, to ensure structural integrity per the design 

specifications; 
Page 23 of 65 

(iv) Inspect dampers, fans, and blowers for proper 

operation; 

(v) Inspect for proper sealing; 

(vi) Inspect motors for proper operation; 

(vii) Inspect combustion chamber refractory lining and 

clean and repair/replace lining, as necessary; 

(viii) Inspect incinerator shell for corrosion and/or hot 

spots; 

(ix) For the burn cycle that follows the inspection, 

document that the incinerator is operating properly and make any 

necessary adjustments; and 

(x) Generally observe that the equipment is maintained in 

good operating condition. 

(xi) Complete all necessary repairs as soon as practicable. 

(h) The owner or operator who uses a wet scrubbing control 

device to control formaldehyde emissions must install, 

calibrate, maintain, and operate monitoring devices that 

continuously monitor and record the gas pressure drop across 

each scrubber and scrubbing liquid flow rate to each scrubber 

according to the procedures in the operations, maintenance, and 

monitoring plan. The pressure drop monitor is to be certified by 

its manufacturer to be accurate within ±250 pascals (±1 inch 

water gauge) over its operating range, and the flow rate monitor 

is to be certified by its manufacturer to be accurate within ±5 
Page 24 of 65 

percent over its operating range. The owner or operator must 

also continuously monitor and record the feed rate of any 

chemical(s) added to the scrubbing liquid. 

(i)(1) The owner or operator who uses process modifications 

to control formaldehyde emissions must establish a correlation 

between formaldehyde emissions and a process parameter(s) to be 

monitored. 

(2) The owner or operator must monitor the established 

parameter(s) according to the procedures in the operations, 

maintenance, and monitoring plan. 

(3) The owner or operator must include as part of their 

operations, maintenance, and monitoring plan the following 

information: 

(i) Procedures for the proper operation and maintenance of 

the process; 

(ii) Process parameter(s) to be monitored to demonstrate 

compliance with the applicable emission limits in § 63.1382. 

Examples of process parameters include LOI, binder solids 

content, and binder application rate; 

(iii) Correlation(s) between process parameter(s) to be 

monitored and formaldehyde emissions; 

(iv) A schedule for monitoring the process parameter(s); 

and 
Page 25 of 65 

(v) Recordkeeping procedures, consistent with the 

recordkeeping requirements of § 63.1386, to show that the 

process parameter value(s) established during the performance 

test is not exceeded. 

(j) The owner or operator must monitor and record the freeformaldehyde content of each resin shipment received and used in 

the formulation of binder. 

(k) The owner or operator must monitor and record the 

formulation of each batch of binder used. 

(l) The owner or operator must monitor and record at least 

once every 8 hours, the product LOI and product density of each 

bonded wool fiberglass product manufactured. 

(m) For all control device and process operating parameters 

measured during the initial performance tests, including the 

materials mix used in the test, the owners or operators of 

glass-melting furnaces, rotary spin manufacturing lines or flame 

attenuation manufacturing lines subject to this subpart may 

change the limits established during the initial performance 

tests if additional performance testing is conducted to verify 

that, at the new control device or process parameter levels, 

they comply with the applicable emission limits in § 63.1382. 

The owner or operator shall conduct all additional performance 

tests according to the procedures in this part 63, subpart A and 

in § 63.1384. 
Page 26 of 65 

(m) For all control device and process operating parameters 

measured during the initial performance tests, the owners or 

operators of glass-melting furnaces, rotary spin manufacturing 

lines or flame attenuation manufacturing lines subject to this 

subpart may change the limits established during the initial 

performance tests if additional performance testing is conducted 

to verify that, at the new control device or process parameter 

levels, they comply with the applicable emission limits in § 

63.1382. The owner or operator shall conduct all additional 

performance tests according to the procedures in this part 63, 

subpart A and in § 63.1384. 

§ 63.1384 Performance test requirements. 

(a) The owner or operator subject to the provisions of this 

subpart shall conduct a performance test to demonstrate 

compliance with the applicable emission limits in § 63.1382. 

Compliance is demonstrated when the emission rate of the 

pollutant is equal to or less than each of the applicable 

emission limits in § 63.1382. The owner or operator shall 

conduct the performance test according to the procedures in 40 

CFR part 63, subpart A and in this section. 

(1) All monitoring systems and equipment must be installed, 

operational, and calibrated prior to the performance test. 

(2) Unless a different frequency is specified in this 

section, the owner or operator must monitor and record process 
Page 27 of 65 

and/or add-on control device parameters at least every 15 

minutes during the performance tests. The arithmetic average for 

each parameter must be calculated using all of the recorded 

measurements for the parameter. 

(3) During each performance test, the owner or operator 

must monitor and record the glass pull rate for each glassmelting furnace and, if different, the glass pull rate for each 

rotary spin manufacturing line and flame attenuation 

manufacturing line. Record the glass pull rate every 15 minutes 

during any performance test required by this subpart and 

determine the arithmetic average of the recorded measurements 

for each test run and calculate the average of the three test 

runs. 

(4) The owner or operator shall conduct a performance test 

for each existing and new glass-melting furnace. During the 

performance test of each gas-fired glass-melting furnace, the 

owner or operator must measure and record the materials mix, 

including the percentages of raw materials and cullet, melted in 

the furnace during the performance test.

(5) During the performance test, the owner or operator of a 

glass-melting furnace controlled by an ESP shall monitor and 

record the ESP parameter level(s), as specified in the 

operations, maintenance, and monitoring plan, and establish the 
Page 28 of 65 

minimum and/or maximum value(s) that will be used to demonstrate 

compliance after the initial performance test. 

(6) During the performance test, the owner or operator of a 

cold top electric furnace that is not equipped with an add-on 

control device for PM emissions control, must monitor and record 

the temperature 46 to 61 centimeters (18 to 24 inches) above the 

molten glass surface to ensure that the maximum temperature does 

not exceed 120 °C (250 °F). 

(7) During the performance test, the owner or operator of a 

glass melting furnace (other than a cold top electric furnace) 

that is not equipped with an add-on control device for PM 

emissions control, must monitor and record the furnace parameter 

level, and establish the minimum and/or maximum value(s) that 

will be used to demonstrate compliance after the initial 

performance test. 

(8) The owner or operator must conduct a performance test 

for each rotary spin manufacturing line, subject to this 

subpart, while producing the building insulation with the 

highest LOI expected to be produced on that line; and for each 

flame attenuation manufacturing line, subject to this subpart, 

while producing the heavy-density product or pipe product with 

the highest LOI expected to be produced on the affected line. 

(9) The owner or operator of each rotary spin manufacturing 

line and flame attenuation manufacturing line regulated by this 
Page 29 of 65 

subpart must conduct performance tests using the resin with the 

highest free-formaldehyde content. During the performance test 

of each rotary spin manufacturing line and flame attenuation 

manufacturing line regulated by this subpart, the owner or 

operator shall monitor and record the free-formaldehyde content 

of the resin, the binder formulation used, and the product LOI 

and density. 

(10) During the performance test, the owner or operator of 

a rotary spin manufacturing line or flame attenuation 

manufacturing line who plans to use process modifications to 

comply with the emission limits in § 63.1382 must monitor and 

record the process parameter level(s), as specified in the 

operations, maintenance, and monitoring plan, which will be used 

to demonstrate compliance after the initial performance test. 

(11) During the performance test, the owner or operator of 

a rotary spin manufacturing line or flame attenuation 

manufacturing line who plans to use a wet scrubbing control 

device to comply with the emission limits in § 63.1382 must 

continuously monitor and record the pressure drop across the 

scrubber, the scrubbing liquid flow rate, and addition of any 

chemical to the scrubber, including the chemical feed rate, and 

establish the minimum and/or maximum value(s) that will be used 

to determine compliance after the initial performance test. 
Page 30 of 65 

(12) During the performance test, the owner or operator of 

a rotary spin manufacturing line or affected flame attenuation 

manufacturing line shall continuously record the operating 

temperature of each incinerator and record the average during 

each 1-hour test; the average operating temperature of the three 

1-hour tests shall be used to monitor compliance. 

(13) Unless disapproved by the Administrator, an owner or 

operator of a rotary spin or flame attenuation manufacturing 

line regulated by this subpart may conduct short-term 

experimental production runs using binder formulations or other 

process modifications where the process parameter values would 

be outside those established during performance tests without 

first conducting performance tests. Such runs must not exceed 1 

week in duration unless the Administrator approves a longer 

period. The owner or operator must notify the Administrator and 

postmark or deliver the notification at least 15 days prior to 

commencement of the short-term experimental production runs. The 

Administrator must inform the owner or operator of a decision to 

disapprove or must request additional information prior to the 

date of the short-term experimental production runs. 

Notification of intent to perform an experimental short-term 

production run shall include the following information: 

(i) The purpose of the experimental production run;

(ii) The affected line; 
Page 31 of 65 

(iii) How the established process parameters will deviate 

from previously approved levels; 

(iv) The duration of the experimental production run; 

(v) The date and time of the experimental production run; 

and 

(vi) A description of any emission testing to be performed 

during the experimental production run. 

(b) To determine compliance with the PM emission limit for 

glass-melting furnaces, use the following equation:

Where: 

E = Emission rate of PM, kg/Mg (lb/ton) of glass 

pulled; 

C = Concentration of PM, g/dscm (gr/dscf); 

Q = Volumetric flow rate of exhaust gases, dscm/h 

(dscf/h); 

K1 = Conversion factor, 1 kg/1,000 g (1 lb/7,000 gr);

and 

P = Average glass pull rate, Mg/h (tons/h). 

(c) To determine compliance with the emission limit for 

formaldehyde, phenol, or methanol for RS manufacturing lines and 

FA manufacturing lines, and for chromium compounds, HF, or HCl 

for glass-melting furnaces, use the following equation: 
Page 32 of 65 

(c) To determine compliance with the emission limit for 

formaldehyde for rotary spin manufacturing lines and flame 

attenuation forming processes, use the following equation: 

Where: 

E = Emission rate of formaldehyde, phenol, methanol, 

chromium compounds, HF, or HCl, kg/Mg (lb/ton) of glass 

pulled; 

C = Measured volume fraction of formaldehyde, phenol, 

methanol, chromium compounds, HF, or HCl, ppm; 

MW = Molecular weight of formaldehyde, 30.03 g/g-mol; 

molecular weight of phenol, 94.11 g/g-mol; molecular 

weight of methanol, 32.04 g/g-mol; molecular weight of 

chromium compounds tested in g/g-mol; molecular weight 

of HF, 20.0064 g/g-mol; molecular weight of HCl, 36.4611 

g/gmol. 

E = Emission rate of formaldehyde, kg/Mg (lb/ton) of 

glass pulled; 

C = Measured volume fraction of formaldehyde, ppm; 

MW = Molecular weight of formaldehyde, 30.03 g/g-mol; 

Q = Volumetric flow rate of exhaust gases, dscm/h 

(dscf/h); 

K1 = Conversion factor, 1 kg/1,000 g (1 lb/453.6 g); 

K2 = Conversion factor, 1,000 L/m3 (28.3 L/ft3); 

K3 = Conversion factor, 24.45 L/g-mol; and 

P = Average glass pull rate, Mg/h (tons/h). 

(d) Following the initial performance or compliance test 

conducted to demonstrate compliance with the chromium compounds 

emissions limit specified in § 63.1382(a)(i), you must conduct 

an annual performance test for chromium compounds emissions from 
Page 33 of 65 

each glass-melting furnace (no later than 12 calendar months 

following the previous compliance test). 

(e) Following the initial performance or compliance test to 

demonstrate compliance with the PM, formaldehyde, phenol, and 

methanol emissions limits specified in § 63.1382, you must 

conduct a performance test to demonstrate compliance with each 

of the applicable PM, formaldehyde, phenol, and methanol 

emissions limits in § 63.1382 at least once every five years. 

§ 63.1385 Test methods and procedures. 

(a) The owner or operator shall use the following methods 

to determine compliance with the applicable emission limits: 

(1) Method 1 (40 CFR part 60, appendix A) for the selection 

of the sampling port location and number of sampling ports; 

(2) Method 2 (40 CFR part 60, appendix A) for volumetric 

flow rate; 

(3) Method 3 or 3A (40 CFR part 60, appendix A) for O2 and 

CO2 for diluent measurements needed to correct the concentration 

measurements to a standard basis; 

(4) Method 4 (40 CFR part 60, appendix A) for moisture 

content of the stack gas; 

(5) Method 5 or Method 29 (40 CFR part 60, appendix A–3) 

for the concentration of total PM. When using Method 5, each run 

must consist of a minimum sample volume of 2 dry standard cubic 

meters (dscm). When using Method 29, each run must consist of a 
Page 34 of 65 

minimum sample volume of 3 dscm. When measuring PM concentration 

using either Method 5 or 29, the probe and filter holder heating 

system must be set to provide a gas temperature no greater than 

120±14°C (248±25°F); 

(5) Method 5 (40 CFR part 60, appendix A) for the 

concentration of PM. Each run shall consist of a minimum run 

time of 2 hours and a minimum sample volume of 60 dry standard 

cubic feet (dscf). The probe and filter holder heating system 

may be set to provide a gas temperature no greater than 177 ±14 

°C (350 ±25 °F);

(6) For measuring the concentration of formaldehyde, use 

one of the following test methods: 

(i) Method 318 (appendix A of this part). Each test run 

must consist of a minimum of 10 spectra. 

(ii) Method 316 (appendix A of this part). Each test run 

must consist of a minimum of 2 dry standard cubic meters (dscm) 

of sample volume. 

(6) Method 316 or Method 318 (appendix A of this part) for 

the concentration of formaldehyde. Each run shall consist of a 

minimum run time of 1 hour; 

(7) Method contained in appendix A of this subpart for the 

determination of product LOI; 

(8) Method contained in appendix B of this subpart for the 

determination of the free-formaldehyde content of resin; 
Page 35 of 65 

(9) Method contained in appendix C of this subpart for the 

determination of product density;

(10) For measuring the concentration of phenol, use Method 

318 (appendix A of this part). Each test run must consist of a 

minimum of 10 spectra. 

(11) For measuring the concentration of methanol, use one 

of the following test methods: 

(i) Method 318 (appendix A of this part). Each test run 

must consist of a minimum of 10 spectra. 

(ii) Method 308 (appendix A of this part). Each test run 

must consist of a minimum of 2 hours. 

(12) Method 29 (40 CFR part 60, appendix A–8) for the 

concentration of chromium compounds. Each test run must consist 

of a minimum sample volume of 3 dscm. 

(1013) An alternative method, subject to approval by the

Administrator. 

(b) Each performance test shall consist of 3 runs. The 

owner or operator shall use the average of the three runs in the 

applicable equation for determining compliance. 

§ 63.1386 Notification, recordkeeping, and reporting 

requirements. 

(a) Notifications. As required by § 63.9(b) through (h) of 

this part, the owner or operator shall submit the following 

written initial notifications to the Administrator:
Page 36 of 65 

(1) Notification for an area source that subsequently 

increases its emissions such that the source is a major source 

subject to the standard; 

(2) Notification that a source is subject to the standard, 

where the initial startup is before November 25, 2011June 14, 

2002. 

(3) Notification that a source is subject to the standard, 

where the source is new or has been reconstructed, the initial 

startup is after November 25, 2011June 14, 2002, and for which 

an application for approval of construction or reconstruction is 

not required; 

(4) Notification of intention to construct a new affected 

source or reconstruct an affected source; of the date 

construction or reconstruction commenced; of the anticipated 

date of startup; of the actual date of startup, where the 

initial startup of a new or reconstructed source occurs after 

November 25, 2011, and for which an application for approval or 

construction or reconstruction is required (See § 63.9(b)(4) and 

(5) of this part);

 (4) Notification of intention to construct a new major 

source or reconstruct a major source; of the date construction 

or reconstruction commenced; of the anticipated date of startup; 

of the actual date of startup, where the initial startup of a 

new or reconstructed source occurs after June 14, 2002, and for 
Page 37 of 65 

which an application for approval or construction or 

reconstruction is required (See § 63.9(b)(4) and (5) of this 

part); 

(5) Notification of special compliance obligations;

(6) Notification of performance test; and (7) Notification 

of compliance status. 

(b) Performance test report. As required by § 63.10(d)(2) 

of the general provisions, the owner or operator shall report 

the results of the initial performance test as part of the 

notification of compliance status required in paragraph (a)(7) 

of this section.Reserved.

(c) Records and reports for a failure to meet a standard. 

(c) Startup, shutdown, and malfunction plan and reports.

(1) In the event that an affected unit fails to meet a 

standard, record the number of failures since the prior 

notification of compliance status. For each failure, record the 

date, time, and duration of each failure. 

(1) The owner or operator shall develop a written plan as 

described in § 63.6(e)(3) that contains specific procedures to 

be followed for operating the source and maintaining the source 

during periods of startup, shutdown, and malfunction and a 

program of corrective action for malfunctioning process 

modifications and control systems used to comply with the 
Page 38 of 65 

standards. In addition to the information required in § 

63.6(e)(3), the plan shall include: 

(i) Procedures to determine and record the cause of the 

malfunction and the time the malfunction began and ended; 

(ii) Corrective actions to be taken in the event of a 

malfunction of a control device or process modification, 

including procedures for recording the actions taken to correct 

the malfunction or minimize emissions; and 

(iii) A maintenance schedule for each control device and 

process modification that is consistent with the manufacturer's 

instructions and recommendations for routine and long-term 

maintenance.

(2) For each failure to meet a standard, record and retain 

a list of the affected source or equipment, an estimate of the 

volume of each regulated pollutant emitted over the standard for 

which the source failed to meet the standard, and a description 

of the method used to estimate the emissions. 

 (2) The owner or operator shall also keep records of each 

event as required by § 63.10(b) of this part and record and 

report if an action taken during a startup, shutdown, or 

malfunction is not consistent with the procedures in the plan as 

described in § 63.10(e)(3)(iv) of this part. 

(3) Record actions taken to minimize emissions in 

accordance with § 63.1382, including corrective actions to 
Page 39 of 65 

restore process and air pollution control and monitoring 

equipment to its normal or usual manner of operation. 

(4) If an affected unit fails to meet a standard, report 

such events in the notification of compliance status required by 

§ 63.1386(a)(7). Report the number of failures to meet a 

standard since the prior notification. For each instance, report 

the date, time, and duration of each failure. For each failure 

the report must include a list of the affected units or 

equipment, an estimate of the volume of each regulated pollutant 

emitted over the standard, and a description of the method used 

to estimate the emissions. 

(d) Recordkeeping. (1) As required by § 63.10(b) of this 

part, the owner or operator shall maintain files of all 

information (including all reports and notifications) required 

by the general provisions and this subpart: 

(i) The owner or operator must retain each record for at 

least 5 years following the date of each occurrence, 

measurement, maintenance, corrective action, report, or record. 

The most recent 2 years of records must be retained at the 

facility. The remaining 3 years of records may be retained off 

site; 

(ii) The owner or operator may retain records on microfilm, 

on a computer, on computer disks, on magnetic tape, or on 

microfiche; and 
Page 40 of 65 

(iii) The owner or operator may report required information 

on paper or on a labeled computer disk using commonly available 

and EPA-compatible computer software. 

(2) In addition to the general records required by § 

63.10(b)(2) of this part, the owner or operator shall maintain 

records of the following information: 

(i) Any bag leak detection system alarms, including the 

date and time of the alarm, when corrective actions were 

initiated, the cause of the alarm, an explanation of the 

corrective actions taken, and when the cause of the alarm was 

corrected; 

(ii) ESP parameter value(s) used to monitor ESP 

performance, including any period when the value(s) deviated 

from the established limit(s), the date and time of the 

deviation, when corrective actions were initiated, the cause of 

the deviation, an explanation of the corrective actions taken, 

and when the cause of the deviation was corrected; 

(iii) Air temperature above the molten glass in an 

uncontrolled cold top electric furnace, including any period 

when the temperature exceeded 120 °C (250 °F) at a location 46 

to 61 centimeters (18 to 24 inches) above the molten glass 

surface, the date and time of the exceedance, when corrective 

actions were initiated, the cause of the exceedance, an 
Page 41 of 65 

explanation of the corrective actions taken, and when the cause 

of the exceedance was corrected; 

(iv) Uncontrolled glass-melting furnace (that is not a cold 

top electric furnace) parameter value(s) used to monitor furnace 

performance, including any period when the value(s) exceeded the 

established limit(s), the date and time of the exceedance, when 

corrective actions were initiated, the cause of the exceedance, 

an explanation of the corrective actions taken, and when the 

cause of the exceedance was corrected; 

(v) The formulation of each binder batch and the LOI and 

density for each product manufactured on a rotary spin 

manufacturing line or flame attenuation manufacturing line 

subject to the provisions of this subpart, and the free 

formaldehyde content of each resin shipment received and used in 

the binder formulation; 

(vi) Process parameter level(s) for RS and FA manufacturing 

lines that use process modifications to comply with the emission 

limits, including any period when the parameter level(s) 

deviated from the established limit(s), the date and time of the 

deviation, when corrective actions were initiated, the cause of 

the deviation, an explanation of the corrective actions taken, 

and when the cause of the deviation was corrected; 

(vii) Scrubber pressure drop, scrubbing liquid flow rate, 

and any chemical additive (including chemical feed rate to the 
Page 42 of 65 

scrubber), including any period when a parameter level(s) 

deviated from the established limit(s), the date and time of the 

deviation, when corrective actions were initiated, the cause of 

the deviation, an explanation of the corrective actions taken, 

and when the cause of the deviation was corrected; 

(viii) Incinerator operating temperature and results of 

periodic inspection of incinerator components, including any 

period when the temperature fell below the established average 

or the inspection identified problems with the incinerator, the 

date and time of the problem, when corrective actions were 

initiated, the cause of the problem, an explanation of the 

corrective actions taken, and when the cause of the problem was 

corrected; 

(ix) Glass pull rate, including any period when the pull 

rate exceeded the average pull rate established during the 

performance test by more than 20 percent, the date and time of 

the exceedance, when corrective actions were initiated, the 

cause of the exceedance, an explanation of the corrective 

actions taken, and when the cause of the exceedance was 

corrected.

(x) Records of your cullet sampling or records of 

inspections from cullet providers. 
Page 43 of 65 

(xi) For each gas-fired glass-melting furnace that uses 

cullet, records of the daily average cullet percentage in the 

materials mix charged to the furnace.

(e) Excess emissions report. As required by § 

63.10(e)(3)(v) of this part, the owner or operator shall report 

semiannually if measured emissions are in excess of the 

applicable standard or a monitored parameter deviates from the 

levels established during the performance test. The report shall 

contain the information specified in § 63.10(c) of this part as 

well as the additional records required by the recordkeeping 

requirements of paragraph (d) of this section. When no 

deviations have occurred, the owner or operator shall submit a 

report stating that no excess emissions occurred during the 

reporting period.

(f) Within 60 days after the date of completing each 

performance test (as defined in § 63.2) required in this 

subpart, you must submit the results of the performance tests, 

including any associated fuel analyses, following the procedure 

specified in either paragraph (f)(1) or (2) of this section. 

(1) For data collected using test methods supported by the 

EPA’s Electronic Reporting Tool (ERT) as listed on the EPA’s ERT 

website (http://www.epa.gov/ttn/chief/ert/index.html), you must 

submit the results of the performance test to the EPA via the 

Compliance and Emissions Data Reporting Interface (CEDRI). CEDRI 
Page 44 of 65 

can be accessed through the EPA’s Central Data Exchange (CDX) 

(http://cdx.epa.gov/epa_home.asp). Performance test data must be 

submitted in a file format generated through the use of the 

EPA’s ERT. Alternatively, you may submit performance test data 

in an electronic file format consistent with the extensible 

markup language (XML) schema listed on the EPA’s ERT website, 

once the XML schema is available. If you claim that some of the 

performance test information being submitted is confidential 

business information (CBI), you must submit a complete file 

generated through the use of the EPA’s ERT or an alternate 

electronic file consistent with the XML schema listed on the 

EPA’s ERT website, including information claimed to be CBI, on a 

compact disc, flash drive or other commonly used electronic 

storage media to the EPA. The electronic media must be clearly 

marked as CBI and mailed to U.S. EPA/OAPQS/CORE CBI Office, 

Attention: Group Leader, Measurement Policy Group, C404-02, 4930 

Old Page Rd., Durham, NC 27703. The same ERT or alternate file 

with the CBI omitted must be submitted to the EPA via the EPA’s 

CDX as described earlier in this paragraph. 

(2) For data collected using test methods that are not 

supported by the EPA’s ERT as listed on the EPA’s ERT website, 

you must submit the results of the performance test to the 

Administrator at the appropriate address listed in § 63.13. 
Page 45 of 65 

(g) All reports required by this subpart not subject to the 

requirements in paragraph (f) of this section must be sent to 

the Administrator at the appropriate address listed in § 63.13. 

If acceptable to both the Administrator and the owner or 

operator of a source, these reports may be submitted on 

electronic media. The Administrator retains the right to require 

submittal of reports subject to paragraph (f) of this section in 

paper format. 

§ 63.1387 Compliance dates. 

(a) Compliance dates. The owner or operator subject to the 

provisions of this subpart shall demonstrate compliance with the 

requirements of this subpart by no later than: 

(1) For existing sources: 

(i) [insert date 2 years after publication in the Federal 

Register] for flame attenuation manufacturing lines; and 

(ii) [insert date 2 years after publication in the Federal 

Register] for gas-fired glass-melting furnaces. (1) June 14, 

2002, for an existing glass-melting furnace, rotary spin 

manufacturing line, or flame attenuation manufacturing line; or 

(2) Upon startup for a new glass-melting furnace, rotary 

spin manufacturing line, or flame attenuation manufacturing 

line. 

(b) Compliance extension. The owner or operator of an 

existing source subject to this subpart may request from the 
Page 46 of 65 

Administrator an extension of the compliance date for the 

emission standards for one additional year if such additional 

period is necessary for the installation of controls. The owner 

or operator shall submit a request for an extension according to 

the procedures in § 63.6(i)(3) of this part. 

§ 63.1388 Startups and shutdowns. 

(a) The provisions set forth in this subpart apply at all 

times. 

(b) You must not shut down items of equipment that are 

required or utilized for compliance with the provisions of this 

subpart during times when emissions are being, or are otherwise 

required to be, routed to such items of equipment. 

(c) Startup begins when the wool fiberglass glass-melting 

furnace has any raw materials added and reaches 50 percent of 

its typical operating temperature. Startup ends when molten 

glass begins to flow from the wool fiberglass glass-melting 

furnace. For cold-top electric furnaces, startup ends when the 

batch cover is established and the temperature of the glass 

batch-cover surface is below 300°F. 

(d) Shutdown begins when the heat sources to the glassmelting furnace are reduced to begin the glass-melting furnace 

shut down process. Shutdown ends when the glass-melting furnace 

is empty or the contents are sufficiently viscous to preclude 

glass flow from the glass-melting furnace. 
Page 47 of 65 

(e) During periods of startup and shutdown in a cold-top 

furnace that is routed to a baghouse during normal operation, 

you must establish the batch cover and operate your furnace 

according to the following requirements during startup and 

shutdown: 

(1) You must keep records showing that you used only 

natural gas or other clean fuels to heat each furnace; and 

(2) Except during the period of establishing batch cover, 

you must keep records showing that you used only cullet as a raw 

material during the startup of each cold-top furnace; And 

(3) Once a batch cover is established so that a control 

device can be safely operated, you must keep records showing 

that furnace emissions were controlled using air pollution 

control devices operated at the parameters established by the 

most recent performance test that showed compliance with the 

standard. 

(4) During periods of shutdown in a cold-top furnace, until 

the conditions above the glass reaches a point at which the 

control device may be damaged if it continues to operate, you 

must keep records showing furnace emissions were controlled 

using air pollution control devices operated at the parameters 

established by the most recent performance test that showed 

compliance with the standard. 
Page 48 of 65 

(f) During both periods of startups and shutdowns for all 

furnace types other than cold-top furnaces, you must operate 

each furnace according to the following requirements: 

(1) You must record the type of fuel used to heat the 

furnace during startup and shutdown to demonstrate that you used 

only natural gas or other clean fuels; and 

(2) You must keep records showing that furnace emissions 

were controlled using air pollution control devices operated at 

the parameters established by the most recent performance test 

that showed compliance with the standard. 

§ 63.1388 Implementation and enforcement. 

(a) This subpart can be implemented and enforced by the 

U.S. EPA, or a delegated authority such as the applicable State, 

local, or Tribal agency. If the U.S. EPA Administrator has 

delegated authority to a State, local, or Tribal agency, then 

that agency, in addition to the U.S. EPA, has the authority to 

implement and enforce this subpart. Contact the applicable U.S. 

EPA Regional Office to find out if implementation and 

enforcement of this subpart is delegated to a State, local, or 

Tribal agency. 

(b) In delegating implementation and enforcement authority 

of this subpart to a State, local, or Tribal agency under 

subpart E of this part, the authorities contained in paragraph 

(c) of this section are retained by the Administrator of U.S. 
Page 49 of 65 

EPA and cannot be transferred to the State, local, or Tribal 

agency. 

(c) The authorities that cannot be delegated to State, 

local, or Tribal agencies are as specified in paragraphs (c)(1) 

through (4) of this section. 

(1) Approval of alternatives to the requirements in §§ 

63.1380, 63., and 63.1387. 

(2) Approval of major alternatives to test methods under § 

63.7(e)(2)(ii) and (f), as defined in § 63.90, and as required 

in this subpart. 

(3) Approval of major alternatives to monitoring under § 

63.8(f), as defined in § 63.90, and as required in this subpart. 

(4) Approval of major alternatives to recordkeeping and 

reporting under § 63.10(f), as defined in § 63.90, and as 

required in this subpart. 

§§ 63.1389-63.1399 [Reserved] 

Table 1 to Subpart NNN of Part 63—Applicability of General 

Provisions (40 CFR Part 63, Subpart A) to Subpart NNN 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

§ 63.1(a)(1)-

(a)(45) 

Applicability Yes.

§ 63.1(a)(56) NoYes [Reserved].

63.1(a)(6)-

(a)(8) 

 Yes. 
Page 50 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

§ 63.1(a)(7)-(9) No [Reserved]. 

§ 63.1(a)(10)-

(a)(14)(12)

 Yes.

§ 63.1(b)(1)-

(b)(3)

Initial 

Applicability 

Determination 

Yes.

§ 63.1(b)(2) No [Reserved]. 

§ 63.1(b)(3) 

 Yes 

§ 63.1(c)(1)-

(c)(2) 

Applicability After 

Standard 

Established

Yes.

§ 63.1(c)(3)-

(c)(4)

 No [Reserved]. 

§ 63.1(c)(4)-

(c)(5)-(e)

 Yes.

63.1(d) No [Reserved]. 

63.1(e) Applicability of 

Permit Program 

Yes. 

§ 63.2 Definitions Yes Additional 

definitions in 

§63.1381.

§ 63.3(a)-(c) Units and 

Abbreviations 

Yes.

§ 63.4(a)(1)-

(a)(32) 

Prohibited 

Activities 

Yes.

§ 63.4(a)(4)(3)-

(5)

 No [Reserved]. 

63.4(a)(5) Yes. 

§ 63.4(b)-(c) Yes.
Page 51 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

§ 63.5(a)(1)-

(ab)(2) 

Construction/Recons

truction 

Yes.

63.5(b)(1) Existing, New, 

Reconstructed 

Yes. 

 

63.5(b)(2) No [Reserved]. 

§ 63.5(b)(3)-

(b)(64) 

 Yes.

§ 63.5(b)(5) No [Reserved]. 

§ 63.5(b)(6) Yes 

§ 63.5(c) No [Reserved]. 

§ 63.5(d) Application for 

Approval of 

Construction/ or 

Reconstruction 

Yes.

§ 63.5(e) Approval of 

Construction/Recons

truction

Yes.

§ 63.5(f) Approval of 

Construction/Recons

truction Based on 

State Review

Yes.

§ 63.6(a)-(d) Compliance with 

Standards and 

Maintenance 

Requirements 

Yes.

63.6(b)(1)-

(b)(5) 

 Yes. 

63.6(b)(6) No [Reserved]. 
Page 52 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

63.6(b)(7) Yes. 

63.6(c)(1) Compliance Date for 

Existing Sources 

Yes §63.1387 

specifies 

compliance 

dates. 

63.6(c)(2) Yes. 

63.6(c)(3)-

(c)(4) 

 No [Reserved]. 

63.6(c)(5) Yes. 

63.6(d) No [Reserved]. 

§ 63.6(e)(1)(i) General Duty to 

Mminimize 

Eemissions. 

No See §63.1382(b) 

for general 

duty 

requirement 

63.6(e)(1)-

(e)(2) 

Operation & 

Maintenance 

Yes §63.1383 

specifies 

operations/main

tenance plan.

§ 63.6(e)(1)(ii) Requirement to 

correct 

malfunctions as 

soon as possible 

No §63.1382(b) 

specifies 

additional 

requirements. 

§ 63.6(e)(1) 

(iii) 

 Yes 

§ 63.6(e)(2) No [Reserved] 

§ 63.6(e)(3) Startup, Shutdown 

Malfunction (SSM) 

Plan 

Yes.No Startups and 

shutdowns 

addressed in 

§63.1388.

§ 63.6(f)(1)-

(f)(3)

Compliance with 

Nonopacity Emission 

StandardsSSM 

exemption

Yes.No
Page 53 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

§ 63.6(f)(2)-(3) Methods for 

Determining 

Compliance 

Yes 

§ 63.6(g)(1)-

(g)(3)

Use of an 

Alternative 

Nonopacity Standard

Emission Standard

Yes.

63.6(h) Opacity/VE 

Standards 

No Subpart NNN-no 

COMS, VE or 

opacity 

standards.

§ 63.6(h)(1) SSM Exemption No 

§ 63.6(h)(2)-(j) Yes 

63.6(i)(1)-

(i)(14) 

Extension of 

Compliance 

Yes. 

63.6(i)(15) No [Reserved]. 

63.6(i)(16) Yes. 

63.6(j) Exemption from 

Compliance 

Yes. 

§ 63.7(a)-(d) Yes 

63.7(a) Performance Testing 

Requirements 

Yes §63.1384 has 

specific 

requirements. 

63.7(b) Notification Yes. 

63.7(c) Quality Assurance 

Program/Test Plan 

Yes. 

63.7(d) Performance Testing 

Facilities 

Yes. 

§ 63.7(e)(1)-

(e)(4)

Conduct of 

Performance 

Testsing

Yes.No See §63.1382(b)

§ 63.7(e)(2)-(4) Yes 
Page 54 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

§ 63.7(f) Alternative Test 

Method 

Yes.

§ 63.7(g)(1) Data Analysis Yes.

§ 63.7(g)(2) No [Reserved]. 

§ 63.7(g)(3) Yes 

§ 63.7(h) Waiver of 

Performance Tests

Yes.

§ 63.8(a)(1)-

(a)(2)(b)

Monitoring 

Requirements 

Yes.

63.8(a)(3) No [Reserved]. 

63.8(a)(4) Yes. 

63.8(b) Conduct of 

Monitoring 

Yes. 

63.8(c) CMS 

Operation/Maintenan

ce 

Yes. 

§ 63.8(c)(1)(i) General Dduty to 

Mminimize 

Eemissions and CMS 

operation 

No See §63.1382(c) 

for general 

duty 

requirement. 

§ 63.8(c)(1)(ii) Yes 

§ 

63.8(c)(1)(iii) 

Requirement to 

Ddevelop SSM Plan 

for CMS 

No 

§ 63.8(c)(2)-

(d)(2) 

 

§63.8(d)(1)-(2) Quality Control 

Program 

Yes. 

§ 63.8(d)(3) Written Pprocedures 

for CMS 

Yes, 

except 

for 

last 

sentenc

e, 

which 

refers 

to SSM 

plan. 
Page 55 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

SSM 

plans 

are not 

require

d. 

§ 63.8(e)-(g) Performance 

Evaluation for CMS

Yes.

63.8(f) Alternative 

Monitoring Method 

Yes. 

63.8(g) Reduction of 

Monitoring Data 

Yes. 

§ 63.9(a) Notification 

Requirements 

Yes.

§ 63.9(b)(1)-(2) Initial 

Notifications 

Yes.

§ 63.9(b)(3) No [Reserved] 

§ 63.9(b)(4)-(j) Yes 

63.9(c) Request for 

Compliance 

Extension 

Yes. 

63.9(d) New Source 

Notification for 

Special Compliance 

Requirements 

Yes. 

63.9(e) Notification of 

Performance Test

Yes. 

63.9(f) Notification of 

VE/Opacity Test 

No Opacity/VE 

tests not 

required. 

63.9(g) Additional CMS 

Notifications 

Yes. 

63.9(h)(1)-

(h)(3) 

Notification of 

Compliance Status 

Yes. 

63.9(h)(4) No [Reserved]. 
Page 56 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

63.9(h)(5)-

(h)(6) 

 Yes. 

63.9(i) Adjustment of 

Deadlines 

Yes. 

63.9(j) Change in Previous 

Information 

Yes. 

§ 63.10(a) Recordkeeping/ and 

Rreporting

requirements

Yes.

§ 63.10(b)(1) General 

Recordkeeping 

Requirements

Yes.

§63.10(b)(2)(i) Recordkeeping of 

occurrence and 

duration of 

startups and 

shutdowns 

No 

§ 

63.10(b)(2)(ii) 

Recordkeeping of 

malfunctions 

No See §63.1386 

(c)(1) through 

(3) for 

recordkeeping 

of occurrence 

and duration 

and actions 

taken during a 

failure to meet 

a standard.

§ 

63.10(b)(2)(iii)

Maintenance records Yes 

§ 

63.10(b)(2)(iv)-

(v) 

Actions taken to 

minimize emissions 

during SSM 

No 

§ 

63.10(b)(2)(vi) 

Recordkeeping for 

CMS malfunctions 

Yes 

§ 

63.10(b)(2)(vii)

-(xiv) 

Other CMS 

requirements 

Yes 

§ 63.10(b)(3) Recordkeeping 

requirements for 

Yes 
Page 57 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

applicability 

determinations 

§ 63.10(c)(1)-

(6)

Additional CMS

Rrecordkeeping

requirements for 

sources with CMS

Yes.

63.10(c)(2)-

(c)(4)

No [Reserved].

§ 63.10(c)(57)-

(c)(8) 

Additional 

Rrecordkeeping 

Rrequirements for 

CMS – Iidentifying 

Eexceedances and 

Eexcess Eemissions

Yes.

§ 63.10(c)(9) No [Reserved]. 

§ 63.10(c)(10)-

(1511) 

Yes.No See §63.1386 

for 

recordkeeping 

of 

malfunctions.

§ 63.10(c)(12)-

(14) 

 

§ 63.10(c)(15) Use of SSM Plan No 

§ 63.10(d)(1)-

(4)

General Reporting 

Requirements 

Yes.

63.10(d)(2) Performance Test 

Results 

Yes. 

63.10(d)(3) Opacity or VE 

Observations 

No No limits for 

VE/opacity. 

63.10(d)(4) Progress Reports Yes. 

§ 63.10(d)(5) Startup, Shutdown, 

MalfunctionSSM

Reports 

Yes.No See §63.1386(c)

for reporting 

of 

malfunctions.

§ 63.10(e)(1)-

(e)(3)(f)

Additional CMS 

Reports Excess 

Emission/CMS 

Performance Reports 

COMS Data Reports 

Yes.
Page 58 of 65 

General 

provisions 

citation 

Requirement 

Applies 

to 

subpart 

NNN? 

Explanation 

Recordkeeping/Repor

ting Waiver

63.10(e)(4) Reporting COM Data No COM not 

required. 

63.10(f) Waiver of 

Recordkeeping/Repor

ting 

Yes. 

§ 63.11(a)-(b) Control Device 

Requirements; 

Applicability of 

Flares

Yes.No Flares will not 

be used to 

comply with the 

emissions 

limits.

63.11(b) Flares No Flares not 

applicable. 

§ 63.11(c) Alternative Work 

Practice for 

Monitoring 

Equipment for Leaks

Yes 

§ 63.11(d) Alternative Work 

Practice Standard 

Yes 

§ 63.11(e) Alternative Work 

Practice 

Requirements 

Yes 

§ 63.12 State Authority and 

Delegations 

Yes.

§ 63.13 State/Regional 

Addresses 

Yes.

§ 63.14 Incorporation by 

Reference 

No 

§ 63.15 Availability of 

Information 

Yes.

§ 63.16 Performance Track 

Provisions 

Yes 

Appendix A to Subpart NNN of Part 63—Method for the

Determination of LOI 
Page 59 of 65 

1. Purpose 

The purpose of this test is to determine the LOI of cured 

blanket insulation. The method is applicable to all cured board 

and blanket products. 

2. Equipment 

2.1 Scale sensitive to 0.1 gram. 

2.2 Furnace designed to heat to at least 540 °C (1,000 °F) 

and controllable to ±10 °C (50 °F). 

2.3 Wire tray for holding specimen while in furnace. 

3. Procedure 

3.1 Cut a strip along the entire width of the product that 

will weigh at least 10.0 grams. Sample should be free of dirt or 

foreign matter. 

NOTE: Remove all facing from sample. 

3.2 Cut the sample into pieces approximately 12 inches 

long, weigh to the nearest 0.1 gram and record. Place in wire 

tray. Sample should not be compressed or overhang on tray edges. 

NOTE: On air duct products, remove shiplaps and overspray. 

3.3 Place specimen in furnace at 540 °C (1,000 °F), ±10 °C 

(50 °F) for 15 to 20 minutes to insure complete oxidation. After 

ignition, fibers should be white and should not be fused 

together. 

3.4 Remove specimen from the furnace and cool to room 

temperature. 
Page 60 of 65 

3.5 Weigh cooled specimen and wire tray to the nearest 0.1 

gram. Deduct the weight of the wire tray and then calculate the 

loss in weight as a percent of the original specimen weight. 

Appendix B to Subpart NNN of Part 63—Free Formaldehyde Analysis 

of Insulation Resins by Hydroxylamine Hydrochloride

1. Scope 

This method was specifically developed for water-soluble 

phenolic resins that have a relatively high free-formaldehyde 

(FF) content such as insulation resins. It may also be suitable 

for other phenolic resins, especially those with a high FF 

content. 

2. Principle 

2.1 a. The basis for this method is the titration of the 

hydrochloric acid that is liberated when hydroxylamine 

hydrochloride reacts with formaldehyde to form formaldoxine: 

HCHO + NH2OH:HCl → CH2:NOH + H2O + HCl

b. Free formaldehyde in phenolic resins is present as 

monomeric formaldehyde, hemiformals, polyoxymethylene 

hemiformals, and polyoxymethylene glycols. Monomeric 

formaldehyde and hemiformals react rapidly with hydroxylamine 

hydrochloride, but the polymeric forms of formaldehyde must 

hydrolyze to the monomeric state before they can react. The 

greater the concentration of free formaldehyde in a resin, the 
Page 61 of 65 

more of that formaldehyde will be in the polymeric form. The 

hydrolysis of these polymers is catalyzed by hydrogen ions. 

2.2 The resin sample being analyzed must contain enough 

free formaldehyde so that the initial reaction with

hydroxylamine hydrochloride will produce sufficient hydrogen 

ions to catalyze the depolymerization of the polymeric 

formaldehyde within the time limits of the test method. The 

sample should contain approximately 0.3 grams free formaldehyde 

to ensure complete reaction within 5 minutes. 

3. Apparatus 

3.1 Balance, readable to 0.01 g or better. 

3.2 pH meter, standardized to pH 4.0 with pH 4.0 buffer and 

pH 7 with pH 7.0 buffer. 

3.3 50-mL burette for 1.0 N sodium hydroxide. 

3.4 Magnetic stirrer and stir bars. 

3.5 250-mL beaker. 

3.6 50-mL graduated cylinder. 

3.7 100-mL graduated cylinder. 

3.8 Timer. 

4. Reagents 

4.1 Standardized 1.0 N sodium hydroxide solution. 

4.2 Hydroxylamine hydrochloride solution, 100 grams per 

liter, pH adjusted to 4.00. 

4.3 Hydrochloric acid solution, 1.0 N and 0.1 N. 
Page 62 of 65 

4.4 Sodium hydroxide solution, 0.1 N. 

4.5 50/50 v/v mixture of distilled water and methyl

alcohol. 

5. Procedure 

5.1 Determine the sample size as follows: 

a. If the expected FF is greater than 2 percent, go to Part 

A to determine sample size. 

b. If the expected FF is less than 2 percent, go to Part B 

to determine sample size. 

c. Part A: Expected FF ≥2 percent. 

Grams resin = 60/expected percent FF 

i. The following table shows example levels: 

Expected % free formaldehyde Sample size, grams 

2 30.0 

5 12.0 

8 7.5 

10 6.0 

12 5.0 

15 4.0 

ii. It is very important to the accuracy of the results 

that the sample size be chosen correctly. If the milliliters of 

titrant are less than 15 mL or greater than 30 mL, reestimate 

the needed sample size and repeat the tests. 

d. Part B: Expected FF <2 percent 

Grams resin = 30/expected percent FF 
Page 63 of 65 

i. The following table shows example levels: 

Expected % free formaldehyde Sample size, grams 

2 15 

1 30 

0.5 60 

ii. If the milliliters of titrant are less than 5 mL or 

greater than 30 mL, reestimate the needed sample size and repeat 

the tests. 

5.2 Weigh the resin sample to the nearest 0.01 grams into a 

250-mL beaker. Record sample weight. 

5.3 Add 100 mL of the methanol/water mixture and stir on a 

magnetic stirrer. Confirm that the resin has dissolved. 

5.4 Adjust the resin/solvent solution to pH 4.0, using the 

prestandardized pH meter, 1.0 N hydrochloric acid, 0.1 N 

hydrochloric acid, and 0.1 N sodium hydroxide. 

5.5 Add 50 mL of the hydroxylamine hydrochloride solution, 

measured with a graduated cylinder. Start the timer. 

5.6 Stir for 5 minutes. Titrate to pH 4.0 with standardized 

1.0 N sodium hydroxide. Record the milliliters of titrant and 

the normality. 

6. Calculations 

7. Method Precision and Accuracy 
Page 64 of 65 

Test values should conform to the following statistical 

precision: 

Variance = 0.005 

Standard deviation = 0.07 

95% Confidence Interval, for a single determination = 0.2 

8. Author 

This method was prepared by K. K. Tutin and M. L. Foster, 

Tacoma R&D Laboratory, Georgia-Pacific Resins, Inc. (Principle 

written by R. R. Conner.) 

9. References 

9.1 GPAM 2221.2. 

9.2 PR&C TM 2.035. 

9.3 Project Report, Comparison of Free Formaldehyde

Procedures, January 1990, K. K. Tutin. 

Appendix C to Subpart NNN of Part 63—Method for the

Determination of Product Density 

1. Purpose 

The purpose of this test is to determine the product 

density of cured blanket insulation. The method is applicable to 

all cured board and blanket products. 

2. Equipment 

One square foot (12 in. by 12 in.) template, or templates 

that are multiples of one square foot, for use in cutting 

insulation samples. 
Page 65 of 65 

3. Procedure 

3.1 Obtain a sample at least 30 in. long across the machine 

width. Sample should be free of dirt or foreign matter. 

3.2 Lay out the cutting pattern according to the plant's 

written procedure for the designated product. 

3.2 Cut samples using one square foot (or multiples of one 

square foot) template. 

3.3 Weigh product and obtain area weight (lb/ft2). 

3.4 Measure sample thickness. 

3.5 Calculate the product density: 

Density (lb/ft3) = area weight (lb/ft2)/thickness (ft)