1147 - 1 

 (Adopted December 5, 2008) 

RULE 1147. NOx REDUCTIONS FROM MISCELLANEOUS SOURCES 

(a) Purpose and Applicability 

The purpose of this rule is to reduce nitrogen oxide emissions from gaseous and 

liquid fuel fired combustion equipment as defined in this rule. This rule applies to 

ovens, dryers, dehydrators, heaters, kilns, calciners, furnaces, crematories, 

incinerators, heated pots, cookers, roasters, fryers, closed and open heated tanks 

and evaporators, distillation units, afterburners, degassing units, vapor 

incinerators, catalytic or thermal oxidizers, soil and water remediation units and 

other combustion equipment with nitrogen oxide emissions that require a District 

permit and are not specifically required to comply with a nitrogen oxide emission 

limit by other District Regulation XI rules. This rule does not apply to solid fuelfired combustion equipment, internal combustion engines subject to District Rule 

1110.2, turbines, charbroilers, or boilers, water heaters, thermal fluid heaters and 

enclosed process heaters subject to District Rules 1109, 1146, 1146.1, or 1146.2 

and equipment subject to District Rules 1111, 1112, 1117, 1118, 1121, or 1135. 

(b) Definitions 

(1) ANNUAL CAPACITY FACTOR means the ratio of the ANNUAL HEAT 

INPUT of a unit in a calendar year to the amount of fuel it could have 

burned if it had operated at the rated heat input capacity for 100 percent of 

the time during the calendar year. 

(2) ANNUAL HEAT INPUT means the actual amount of heat released by 

fuels burned in a unit during a calendar year, based on the fuel's higher 

heating value. 

(3) BTU means British thermal unit or units. 

(4) COMBUSTION MODIFICATION means replacement of a burner(s). 

(5) FOOD OVEN means an oven used to heat or cook food used for human 

consumption. 

(6) HEATER means any combustion equipment that is fired with gaseous 

and/or liquid fuels and which transfers heat from combusted fuel to 

materials or air contained in the unit or in an adjoining cabinet, container 

or structure. Heater does not include any boiler or PROCESS HEATER 

designed to transfer heat to water or process streams that is subject to any 
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NOx emission limits of District Rules 1109, 1146, 1146.1 or 1146.2, and 

does not include any internal combustion engine or turbine. 

(7) HEAT INPUT means the higher heating value of the fuel to the unit 

measured as BTU per hour. 

(8) HEAT OUTPUT means the enthalpy of the working fluid output of the 

unit. 

(9) MAKE-UP AIR HEATER means a UNIT used to heat incoming air in 

order to maintain the temperature of a spray booth, container, room or 

other enclosed space where a person is working. A MAKE-UP AIR 

HEATER is not a burner used to heat an oven, dryer, heater or other unit 

where workers are not present during heating. 

(10) NOx EMISSIONS means the sum of nitrogen oxide and nitrogen dioxide 

in the flue gas, collectively expressed as nitrogen dioxide. 

(11) PROCESS HEATER means any equipment that is fired with gaseous 

and/or liquid fuels and which transfers heat from combusted fuel to water 

or process streams. PROCESS HEATER does not include any furnace, 

kiln or oven used for melting, heat treating, annealing, drying, curing, 

baking, cooking, calcining, or vitrifying; or any unfired waste heat 

recovery heater that is used to recover sensible heat from the exhaust of 

any combustion equipment. 

(12) PROTOCOL means a South Coast Air Quality Management District 

approved test protocol for determining compliance with emission limits 

for applicable equipment. 

(13) RATED HEAT INPUT CAPACITY means the gross HEAT INPUT of the 

combustion UNIT specified on a permanent rating plate attached by the 

manufacturer to the device. If the UNIT has been altered or modified such 

that its gross HEAT INPUT is higher or lower than the rated HEAT 

INPUT capacity specified on the original manufacturer’s permanent rating 

plate, the new gross HEAT INPUT shall be considered as the rated HEAT 

INPUT capacity. 

(14) REMEDIATION UNIT means a device used to capture or incinerate air 

toxics, VOCs or other combustible vapors extracted from soil or water. 

(15) RESPONSIBLE OFFICIAL means: 

(A) For a corporation: a president or vice-president of the corporation 

in charge of a principal business function or a duly authorized 
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person who performs similar policy-making functions for the 

corporation; or 

(B) For a partnership or sole proprietorship: general partner or 

proprietor, respectively. 

(C) For a government agency: a duly authorized person 

(16) TENTER FRAME DRYER is a cloth dryer that holds the edges of the 

material as it is dried in order to control shrinkage. 

(17) THERM means 100,000 BTU. 

(18) UNIT means any oven, dryer, dehydrator, heater, kiln, calciner, furnace, 

crematory, incinerator, heated pot, cooker, roaster, fryer, heated tank and 

evaporator, distillation unit, afterburner, degassing unit, vapor incinerator, 

catalytic or thermal oxidizer, soil or water remediation units and other 

combustion equipment with nitrogen oxide emissions requiring a District 

permit and not specifically required to comply with a NOx emission limit 

by other District Regulation XI rules. UNIT does not mean any solid fuel 

fired combustion equipment, internal combustion engine subject to District 

Rule 1110.2, turbine, charbroiler, or boiler, water heater, thermal fluid 

heaters or enclosed process heater subject to District Rules 1109, 1146, 

1146.1, or 1146.2 or equipment subject to District Rules 1111, 1112, 

1117, 1118, 1121, or 1135. 

(19) VAPOR INCINERATOR means a furnace, afterburner, or other device for 

burning and destroying air toxics, VOCs or other combustible vapors in 

gas or aerosol form in gas streams. 

(c) Requirements 

(1) On or after January 1, 2010 any person owning or operating a unit subject 

to this rule shall not operate the unit in a manner that exceeds the 

applicable nitrogen oxide emission limit specified in Table 1 at the time a 

District permit is required for operation of a new, relocated or modified 

unit or, for in-use units, in accordance with the compliance schedule in 

Table 2, or at the time of a combustion modification. 
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Table 1 – NOx Emission Limit 

NOx Emission Limit 

Equipment Category(ies) PPM @ 3% O2, dry or Pound/mmBtu heat input

Process Temperature 

Gaseous Fuel-Fired Equipment  800° F

> 800 ° F and 

< 1200° F  1200 ° F

Asphalt Manufacturing Operation 40 ppm 40 ppm 

Afterburner, Degassing Unit, Remediation 

Unit, Thermal Oxidizer, Catalytic Oxidizer 

or Vapor Incinerator 1

30 ppm or 0.036 

lb/mmBtu 

60 ppm or 0.073 

lb/mmBtu 

60 ppm or 0.073 

lb/mmBtu 

Evaporator, Fryer, Heated Process Tank, or 

Parts Washer 

60 ppm or 0.073 

lb/mmBtu 

60 ppm or 0.073 

lb/mmBtu 

Metal Heat Treating, Metal Melting 

Furnace, Metal Pot, or Tar Pot 

60 ppm or 0.073 

lb/mmBtu

60 ppm or 0.073 

lb/mmBtu

60 ppm or 0.073 

lb/mmBtu

Oven, Dehydrator, Dryer, Heater, Kiln, 

Crematory, Incinerator, Calciner, Cooker, 

Roaster, Furnace, or Heated Storage Tank 

30 ppm or 0.036 

lb/mmBtu 

30 ppm or 0.036 

lb/mmBtu 

60 ppm or 0.073 

lb/mmBtu 

Make-Up Air Heater or other Air Heater 

located outside of building with temperature 

controlled zone inside building 

30 ppm or 0.036 

lb/mmBtu 

Tenter Frame or Fabric or Carpet Dryer 30 ppm or 0.036 

lb/mmBtu 

Other Unit or Process Temperature 30 ppm or 0.036 

lb/mmBtu 

30 ppm or 0.036 

lb/mmBtu 

60 ppm or 0.073 

lb/mmBtu 

Liquid Fuel-Fired Equipment  800° F

> 800 ° F and 

< 1200° F  1200 ° F

All liquid fuel-fired Units 40 ppm or 0.053 

lb/mmBtu 

40 ppm or 0.053 

lb/mmBtu 

60 ppm or 0.080 

lb/mmBtu 

1. Emission limit applies to burners in units fueled by 100% natural gas that are used to incinerate air 

toxics, VOCs, or other vapors; or to heat a unit. The emission limit applies solely when burning 

100% fuel and not when the burner is incinerating air toxics, VOCs, or other vapors. The unit shall 

be tested or certified to meet the emission limit while fueled with natural gas. 
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Table 2 – Compliance Schedule for In-Use Units 

Equipment Category(ies) Compliance Date 

Remediation UNIT 

Upon combustion modification or change of 

location for units manufactured prior to 1998 

Beginning January 1, 2011 

Tar Pot 

Permit Application for Change of Ownership or 

New Equipment 

Beginning January 1, 2012 

Afterburner, degassing unit, catalytic oxidizer, 

thermal oxidizer, vapor incinerator, evaporator, 

food oven, fryer, heated process tank, parts 

washer or spray booth make-up air heater 

manufactured prior to 1998 

July 1, 2013 

Other UNIT manufactured prior to 1986 July 1, 2010 

Other UNIT manufactured prior to 1992 July 1, 2011 

Other UNIT manufactured prior to 1998 July 1, 2012 

Any UNIT manufactured after 1997 July 1 of the year the unit is 15 years old 

(2) Unit age shall be based on the original date of manufacture and determined 

by: 

(A) Original manufacturer's identification or rating plate permanently 

fixed to the equipment. If not available, then; 

(B) Invoice from manufacturer for purchase of equipment. If not 

available, then; 

(C) Information submitted to AQMD with prior permit applications for 

the specific unit. If not available, then; 

(D) Unit is deemed by AQMD to be 20 years old. 

(3) Owners or operators of units operating with flue gas oxygen 

concentrations greater than 18% shall use a District approved test protocol 

to determine compliance with the emission limit specified in Table 1. The 

test protocol shall be submitted to the District at least 90 days prior to the 

scheduled test and approved by the District Source Testing Division. 

(4) Notwithstanding the requirements of paragraph (c)(1), units with 

combustion modifications completed prior to December 5, 2008 and after 

January 1, 2000 that resulted in replacement of more than 75% of the rated 

heat input capacity shall comply with the applicable emission limit 

specified in Table 1 of paragraph (c)(1) ten years from the date the 

modification was performed. 
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(5) The date a combustion modification, as specified in paragraphs (c)(1) and 

(c)(4), is performed; shall be determined according to subparagraph 

(c)(2)(B), if not available, then subparagraph (c)(2)(C). 

(6) Notwithstanding the requirements of paragraph (c)(1), a unit with a 

District permit to construct or permit to operate, and with a permit 

emission limit of one pound per day or less of nitrogen oxides on July 1, 

2009, shall comply with the applicable emission limit specified in Table 1 

of paragraph (c)(1) five years later than the applicable compliance date in 

Table 2 of (c)(1). 

(7) On or after January 1, 2010, any person owning or operating a unit subject 

to this rule shall perform combustion system maintenance in accordance 

with the manufacturer's schedule and specifications as identified in the 

manual and other written materials supplied by the manufacturer or 

distributor. The owner or operator shall maintain on site at the facility 

where the unit is being operated a copy of the manufacturer’s and/or 

distributor's written instructions and retain a record of the maintenance 

activity for a period of not less than three years. The owner or operator 

shall maintain on site at the facility where the unit is being operated a copy 

of the District certification or District approved source test reports, 

conducted by an independent third party, demonstrating the specific unit 

complies with the emission limit. The source test report(s) must identify 

that the source test was conducted pursuant to a District approved 

protocol. The model and serial numbers of the specified unit shall clearly 

be indicated on the source test report(s). The owner or operator shall 

maintain on the unit in an accessible location a permanent rating plate. 

The maintenance instructions, maintenance records and the source test 

report(s) or District certification shall be made available to the Executive 

Officer upon request. 

(8) On or after January 1, 2011, any person owning or operating a unit subject 

to this rule shall install and maintain in service non-resettable, totalizing, 

fuel and time meters for each unit’s fuel(s). Owners or operators of a unit 

with a combustion system that operates at only one firing rate shall install 

a non-resettable, totalizing, time or fuel meter for each fuel. 

(9) Meters specified in paragraph (c)(8) that require electric power to operate 

shall be provided a permanent supply of electric power that cannot be 

unplugged, switched off, or reset except by the main power supply circuit 
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1147 - 7 

for the building and associated equipment or the unit’s safety shut-off 

switch. Any person operating a unit subject to this rule shall not shut off 

electric power to a unit meter unless the unit is not operating and is shut 

down for maintenance or safety. 

(10) On or before the compliance date, the owner or operator of a unit shall 

demonstrate compliance with the applicable emission limit in Table 1 

pursuant to the provisions of subdivisions (d) or (e). 

(11) Compliance by Certification 

 For units that do not allow adjustment of the fuel and combustion air for 

the combustion system by the owner or operator, and upon approval by the 

Executive Officer, an owner or operator may demonstrate compliance with 

the emission limit and demonstration requirement of this subdivision by 

certification granted to the manufacturer for any model of equipment sold 

for use in the District. Any unit certified pursuant to subdivision (e) shall 

be deemed in compliance with the emission limit in Table 1 and 

demonstration requirement of this subdivision, unless a District source test 

shows non-compliance. 

(12) Identification of Units 

(A) New Manufactured Units 

The manufacturer shall display the model number and the rated 

heat input capacity of the unit complying with subdivision (c) on 

the shipping container and permanent rating plate. The 

manufacturer shall also display the District certification status on 

the shipping container and on the unit when applicable. 

(B) Modified Units 

The owner or operator of a unit with a modified combustion 

system (new or modified burners) shall display the new rated heat 

input capacity on a new permanent supplemental rating plate 

installed in an accessible location. The gross heat input shall be 

based on the maximum fuel input corrected for fuel heat content, 

temperature and pressure. Gross heat input shall be demonstrated 

by a calculation based on fuel consumption recorded by an in-line 

fuel meter. 

(13) The owner or operator shall maintain on site a copy of all documents 

identifying the unit’s rated heat input capacity for as long as the unit is 

retained on-site. The rated heat input capacity shall be identified by a 
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1147 - 8 

manufacturer’s or distributor’s manual or invoice and a permanent rating 

plate attached to the unit. If a unit is modified, the rated heat input 

capacity shall be calculated pursuant to subparagraph (c)(12)(B). The 

documentation of rated heat input capacity for modified units shall include 

the name of the company and person modifying the unit, a description of 

all modifications, the dates the unit was modified and calculation of rated 

heat input capacity. The documentation for modified units shall be signed 

by the highest ranking person modifying the unit. 

(14) Alternate Compliance Plan 

 Owners or operators of facilities with five or more in-use units with permit 

emission limits greater than one pound per day NOx that will require 

burner modifications may submit an alternate compliance plan by July 1, 

2009 to phase-in compliance of all units starting January 1, 2010 and 

ending before January 1, 2015. At least one unit shall be modified to 

comply with the applicable emission limit of this rule by January 1, 2010. 

Each year thereafter, up to a maximum of four years, a minimum of 20 

percent of additional units shall comply with the applicable emission limit. 

All units must comply with the applicable emission limit of this rule by 

January 1, 2015. 

(d) Compliance Determination 

(1) All emission determinations shall be calculated: 

(A) Using a District approved test protocol averaged over a period of at 

least 15 and no more than 60 consecutive minutes; 

(B) At least 15 minutes after unit start up; and 

(C) In the unit’s as-found operating condition. 

 Each time an emission determination is required by this rule, an additional 

emission determination shall be made using a heat input of less than 25% 

of the rated heat input capacity for any Afterburner, Degassing Unit, 

Remediation Unit, Thermal Oxidizer, Catalytic Oxidizer, Vapor 

Incinerator, Make-Up Air Heater, other Air Heater located outside of 

process building, Oven, Dehydrator, Dryer, Tenter-Frame Dryer, Fabric 

Dryer, Carpet Dryer, Heater, Kiln, Crematory, Incinerator, Calciner, 

Cooker, Roaster, non-metallurgical Furnace, or Heated Storage Tank that 
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operates with variable heat input that falls below 50% rated heat input 

capacity during normal operation. 

 For emission determinations after the initial approved test, the operator is 

not required to resubmit a protocol for approval if: there is a previously 

approved protocol and the unit has not been altered in a manner that 

requires a permit alteration; and rule or permit emission limits have not 

changed since the previous test. 

(2) All parts per million emission limits specified in subdivision (c) are 

referenced at 3 percent volume stack gas oxygen on a dry basis. 

(3) Compliance with the NOx emission limits of subdivision (c) and 

determination of stack-gas oxygen and carbon dioxide concentrations for 

this rule shall be determined according to the following procedures: 

(A) District Source Test Method 100.1 – Instrumental Analyzer 

Procedures for Continuous Gaseous Emission Sampling (March 

1989); or 

(B) District Source Test Method 7.1 – Determination of Nitrogen 

Oxide Emissions from Stationary Sources (March 1989); or 

(C) ASTM Method D6522-00 – Standard Test Method for

Determination of Nitrogen Oxides, Carbon Monoxide, and Oxygen 

Concentrations in Emissions from Natural Gas-Fired Reciprocating 

Engines, Combustion Turbines, Boilers, and Process Heaters Using 

Portable Analyzers; or 

(D) United States Environmental Protection Agency Conditional Test 

Method CTM-030 – Determination of Nitrogen Oxides, Carbon 

Monoxide, and Oxygen Emissions from Natural Gas-Fired 

Engines, Boilers and Process Heaters Using Portable Analyzers; 

and 

(E) District Source Test Method 10.1 – Carbon Monoxide and Carbon 

Dioxide by Gas Chromatograph/Non-Dispersive Infrared Detector 

(GC/NDIR) – Oxygen by Gas Chromatograph-Thermal 

Conductivity (GC/TCD) (March 1989); or 

(F) Any alternative test method determined approved before the test in 

writing by the Executive Officers of the District, the California Air 

Resources Board and the United States Environmental Protection 

Agency. 
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1147 - 10 

(4) For any operator who chooses the pound per million Btu of heat input 

compliance option of subdivision (c), NOx emissions in pounds per 

million Btu of heat input shall be calculated using procedures in 40 CFR 

Part 60, Appendix A, Method 19, Sections 2 and 3. 

(5) Records of source tests shall be maintained for ten years and made 

available to District personnel upon request. Emissions determined to 

exceed any limits established by this rule through the use of any of the test 

methods specified in subparagraphs (d)(3)(A) through (d)(3)(F) shall 

constitute a violation of this rule. 

(6) All emission determinations shall be made using an independent 

contractor to conduct the source testing that is approved by the Executive 

Officer under the Laboratory Approval Program for the necessary test 

methods. 

(e) Certification 

(1) Unit Certification 

For units that do not allow adjustment of the fuel and combustion air for 

the combustion system by the owner or operator, any manufacturer or 

distributor that distributes for sale or sells units or burner systems for use 

in the District may elect to apply to the Executive Officer to certify such 

units or burner systems as compliant with subdivision (c). 

(2) Manufacturer Confirmation of Emissions 

Any manufacturer’s application to the Executive Officer to certify a model 

of equipment as compliant with the emission limit and demonstration 

requirement of subdivision (c) shall obtain confirmation from an 

independent contractor that is approved by the Executive Officer under the 

Laboratory Approval Program for the necessary test methods prior to 

applying for certification that each unit model complies with the 

applicable requirements of subdivision (c). This confirmation shall be 

based upon District approved emission tests of standard model units and a 

District approved protocol shall be adhered to during the confirmation 

testing of all units subject to this rule. Emission testing shall comply with 

the requirements of paragraphs (d)(1) through (d)(5) except emission 

determinations shall be made at 100% rated heat input capacity and an 

additional emission determination shall be made using a heat input of less 
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than 25% of the rated heat input capacity for any Afterburner, Degassing 

Unit, Remediation Unit, Thermal Oxidizer, Catalytic Oxidizer, Vapor 

Incinerator, Make-Up Air Heater, other Air Heater located outside of 

process building, Oven, Dehydrator, Dryer, Tenter-Frame Dryer, Fabric 

Dryer, Carpet Dryer, Heater, Kiln, Crematory, Incinerator, Calciner, 

Cooker, Roaster, non-metallurgical Furnace, or Heated Storage Tank. 

(3) When applying for unit(s) certification, the manufacturer shall submit to 

the Executive Officer the following: 

(A) A statement that the model is in compliance with subdivision (c). 

The statement shall be signed and dated by the manufacturer’s 

responsible official and shall attest to the accuracy of all 

statements; 

(B) General Information 

(i) Name and address of manufacturer, 

(ii) Brand name, if applicable, 

(iii) Model number, as it appears on the unit rating plate; and 

(iv) Rated Heat Input Capacity, gross output of burner(s) and 

number of burners; 

(C) A description of each model being certified; and 

(D) A source test report verifying compliance with the applicable 

emission limit in subdivision (c) for each model to be certified. 

The source test report shall be prepared by the confirming 

independent contractor and shall contain all of the elements 

identified in the District approved Protocol for each unit tested. 

The source test shall have been conducted no more than ninety (90) 

days prior to the date of submittal to the Executive Officer. 

(4) When applying for unit certification, the manufacturer shall submit the 

information identified in paragraph (e)(3) no more than ninety (90) days 

after the date of the source test identified in subparagraph (e)(3)(D) and at 

least 120 days prior to the date of the proposed sale and installation of any 

District certified unit. 

(5) The Executive Officer shall certify a unit model which complies with the 

provisions of subdivision (c) and of paragraphs (e)(2), (e)(3), and (e)(4). 

(6) Certification status shall be valid for four years from the date of approval 

by the Executive Officer. After the fourth year, recertification shall be 
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required by the Executive Officer according to the requirements of 

paragraphs (e)(2), (e)(3), and (e)(4). 

(f) Enforcement 

(1) The Executive Officer may inspect certification records and unit 

installation, operation, maintenance, repair, combustion modification and 

test records of owners, operators, manufacturers, distributors, retailers, and 

installers of units located in the District, and conduct such tests as are 

deemed necessary to ensure compliance with this rule. Tests shall include 

emission determinations, as specified in paragraph (d)(1) to (d)(4), of a 

random sample of any category of units subject to this rule. 

(2) An emission determination specified under paragraph (f)(1) that finds 

emissions in excess of those allowed by this rule or permit conditions shall 

constitute a violation of this rule. 

(g) Exemptions 

(1) The provisions of this rule shall not apply to units: 

(A) subject to the nitrogen oxide limits of District Rules 1109, 1110.2, 

1111, 1112, 1117, 1121, 1134, 1135, 1146, 1146.1, or 1146.2; or 

(B) located at RECLAIM facilities. 

(2) The provisions of this rule shall not apply to charbroilers. 

(3) The provisions of this rule shall not apply to:

(A) Flares subject to District Rule 1118; 

(B) Flares, afterburners, degassing units, thermal or catalytic oxidizers 

or vapor incinerators in which a fuel, including but not limited to 

natural gas, propane, butane or liquefied petroleum gas, is used 

only to maintain a pilot for vapor ignition or is used for five 

minutes or less to bring a unit up to operating temperature; 

(C) Municipal solid waste incinerators with a District permit operating 

before December 5, 2008; 

(D) An afterburner or vapor incinerator with a District permit operating 

before December 5, 2008 that has an integrated heat exchanger that 

captures heat from an oven or furnace exhaust in order to reduce 

fuel consumption by the afterburner or vapor incinerator; or 

(E) A flare, afterburner, degassing unit, remediation unit, thermal 

oxidizer, catalytic oxidizer or vapor incinerator process in which a 
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1147 - 13 

fuel, including but not limited to natural gas, propane, butane or 

liquefied petroleum gas, is mixed with air toxics, VOCs, landfill 

gas, digester gas or other combustible vapors prior to incineration 

in the unit, in order to maintain vapor concentration above the 

upper explosion limit or above a manufacturer specified limit in 

order to maintain combustion or temperature in the unit. This 

exemption does not apply to a burner with a separate fuel line used 

to heat up or maintain temperature of a unit or incinerate air toxics, 

VOCs or other combustible vapors in a gas stream moving past the 

burner flame. 

(4) New afterburners, degassing units, thermal oxidizers, catalytic oxidizers, 

vapor incinerators, and spray booth make-up air heaters installed for use at 

a specific facility after December 5, 2008 and before January 1, 2011, are 

exempt from the emission limit in Table 1 until July 1 of the year the unit 

is 15 years old. 

(5) New or relocated remediation units installed after December 5, 2008 and 

before January 1, 2011, are exempt from the emission limit in Table 1 

until a combustion modification or change of location on or after January 

1, 2011. 

(6) New food ovens, fryers, heated process tanks, parts washers, and 

evaporators installed after December 5, 2008 and operating before January 

1, 2013, are exempt from the emission limit in Table 1 until July 1 of the 

year the unit is 15 years old. 

(7) Remediation units are exempt from the applicable emission limit in Table 

1 while fueled with propane, butane or liquefied petroleum gas in a 

location where natural gas is not available. Remediation units must 

comply with the emission limit when natural gas is available and while 

fueled with natural gas.