MARCH 03, 1994

1
NEVADA ADMINISTRATIVE CODE SECTIONS 

Adopted March 3, 1994, Effective March 29, 1994

LCB File No. R015-94; Petition 94008 

Appears as NAC 445B.520 in the Petition. 

NAC 445B.075 “Fugitive dust” defined. (NRS 445B.210) “Fugitive dust” means emissions of 

solid, airborne particulate matter which could not reasonably pass through a stack, chimney, vent 

or a functionally equivalent opening. 

 [Environmental Comm’n, Air Quality Reg. § 1.30, eff. 11-7-75; renumbered as § 1.86,

12-4-76; A and renumbered as § 1.75, 10-16-80]—(NAC A 3-29-94, eff. 11-15-94)—

(Substituted in revision for NAC 445.520) 

Appears as NAC 445B.548 in the Petition. 

NAC 445B.103 “Monitoring device” defined. (NRS 445B.210) “Monitoring device” means 

the total equipment used to measure and record emissions and process parameters which is 

required pursuant to 42 U.S.C. §§ 7401 to 7671q, inclusive, or NAC 445B.001 to 445B.601, 

inclusive, or as a condition of an operating permit. 

 [Environmental Comm’n, Air Quality Reg. § 1.110, eff. 12-4-76]—(NAC A 3-29-94, eff. 

1-11-96; 10-30-95, eff. 1-11-96)—(Substituted in revision for NAC 445.548) 

Appears as NAC 445B.552 in the Petition.

NAC 445B.109 “Nitrogen oxides” defined. (NRS 445B.210) “Nitrogen oxides” means all 

oxides of nitrogen except nitrous oxide, as measured by test methods approved by the EPA. 

 [Environmental Comm’n, Air Quality Reg. § 1.116, eff. 12-4-76]—(NAC A 3-29-94, eff. 

11-15-94)—(Substituted in revision for NAC 445.552) 

Sec. 3. of Petition 94008 subsequently codified as; 

NAC 445B.178 “Source reduction” defined. (NRS 445B.210)

 1. “Source reduction” means any practice which reduces: 

 (a) The amount of a regulated air pollutant or pollutants, including fugitive emissions, emitted 

to the ambient air before the application of control equipment; and 

 (b) The hazards to public health and the environment associated with the emission of the 

regulated air pollutant or pollutants. 

 2. The term includes modifications of equipment or technology, modifications of procedure 

or process, reformulation or redesign of products, substitution of raw materials, and

improvements in housekeeping, maintenance, training or control of inventory. 

 3. The term does not include any practice which alters the physical, chemical or biological 

characteristics or the volume of the regulated air pollutant through a process or activity which is 

not integral to and necessary for the production of a product or the provision of a service. 

 (Added to NAC by Environmental Comm’n, eff. 3-29-94)—(Substituted in revision for NAC 

445.6235) 

Appears as NAC445B.625 in the Petition. 

NAC 445B.182 “Standard” defined. (NRS 445B.210) “Standard” means a standard of 

performance that is proposed or promulgated by the Administrator or the Director pursuant to 

NAC 445B.001 to 445B.735, inclusive. 

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 [Environmental Comm’n, Air Quality Reg. § 1.180, eff. 12-4-76]—(NAC A 3-29-94, eff. 

11-15-94; 7-5-94) 

Appears as NAC 445B.650 in the Petition. 

NAC 445B.202 “Volatile organic compounds” defined. (NRS 445B.210) “Volatile organic 

compounds” has the meaning ascribed to it in 40 C.F.R. § 51.100(s), as incorporated by 

reference in NAC 445B.221. 

 [Environmental Comm’n, Air Quality Reg. § 1.67, eff. 11-7-75; renumbered as § 1.208, 

12-4-76; A and renumbered as § 1.204, 8-28-79]—(NAC A 3-29-94, eff. 11-15-94)—

(Substituted in revision for NAC 445.650) 

Appears as NAC 445B.7162 in the Petition. 

NAC 445B.22083 Construction, major modification or relocation of plants to generate 

electricity using steam produced by burning of fossil fuels. (NRS 445B.210)

 1. Except as otherwise provided in subsections 2 and 3, a person shall not make a major

modification to an existing plant or construct a new plant to generate electricity using steam 

produced by the burning of fossil fuels within: 

 (a) The Las Vegas Valley, Hydrographic Area 212; 

 (b) The El Dorado Valley, Hydrographic Area 167; 

 (c) The Ivanpah Valley, Hydrographic Areas 164 a and 164 b; or 

 (d) The city limits of Boulder City. 

 2. Fossil fuel-fired power generating units Numbers 1, 2 and 3 at Clark Station and fossil 

fuel-fired power generating unit Number 1 at Sunrise Station may be relocated to the Ivanpah 

Valley and retain their operating permits if the emission units that are relocated use the best

available control technology. 

 3. If an emission unit is relocated to Ivanpah Valley: 

 (a) The previously used emission unit must be deactivated and removed from the previous site 

when the relocated unit begins operation. 

 (b) Any credit for reduced emission is not available as an offset credit.

 4. As used in this section, “major modification” has the meaning ascribed to it in 40 C.F.R. § 

51.165, as incorporated by reference in NAC 445B.221. 

 (Added to NAC by Environmental Comm’n, eff. 9-4-92; A 3-29-94)—(Substituted in revision

for NAC 445B.389) 

Sec. 4. of Petition 94008 subsequently codified as;

NAC 445B.271 Use of alternative method or equivalent method to determine compliance 

with permit. (NRS 445B.210) An alternative method or an equivalent method may be used to 

determine compliance with a standard, requirement or condition for a permit that is required 

pursuant to 42 U.S.C. §§ 7401 to 7671q, inclusive, if it is first approved by the Administrator. 

 (Added to NAC by Environmental Comm’n, 3-29-94, eff. 1-11-96; A 10-30-95, eff. 

1-11-96)—(Substituted in revision for NAC 445.6945) 

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NOVEMBER 03, 1993

1
NEVADA ADMINISTRATIVE CODE SECTIONS 

Adopted November 3, 1993, Effective December 13, 1993

LCB File No. R138-93; Petition 94002 

Sec. 2. of Petition 94002 subsequently codified as;

NAC 445B.003 “Adjacent properties” defined. (NRS 445B.210) “Adjacent properties” means 

parcels of land that lie near each other or in close proximity. 

 (Added to NAC by Environmental Comm’n, eff. 12-13-93)—(Substituted in revision for

NAC 445.4325) 

Sec. 4. of Petition 94002 subsequently codified as;

NAC 445B.007 “Affected state” defined. (NRS 445B.210) “Affected state” means a state that 

is within 50 miles of a Class I source located in this State, or a state that is contiguous to this 

State whose air quality may be affected by emissions from a Class I source located in this State. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 11-15-94)—(Substituted in

revision for NAC 445.4346) 

Sec. 7. of Petition 94002 subsequently codified as;

NAC 445B.021 “Area source” defined. (NRS 445B.210) “Area source” means any stationary

source of hazardous air pollutants that is not a major source. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 11-15-94)—(Substituted in

revision for NAC 445.4425) 

Sec. 8. of Petition 94002 subsequently codified as; 

NAC 445B.034 “Class I-A application” defined. (NRS 445B.210) “Class I-A application”

means an application for a Class I operating permit that is required for any existing source which

is subject to the requirements of 42 U.S.C. §§ 7661 to 7661f, inclusive. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 1-11-96; A 10-30-95, eff. 

1-11-96)—(Substituted in revision for NAC 445.4615) 

Appears as NAC 445B.477 in the Petition. 

NAC 445B.043 “Confidential information” defined. (NRS 445B.210) “Confidential 

information” has the meaning ascribed to it in subsection 6 of NRS 445B.570. 

 [Environmental Comm’n, Air Quality Reg. §§ 1.15-1.15.3, eff. 11-7-75; A and renumbered as 

§ 1.41, 12-4-76]—(NAC A 12-13-93, eff. 11-15-94)—(Substituted in revision for NAC 445.477) 

Sec. 13. of Petition 94002 subsequently codified as; 

NAC 445B.055 “Effective date of the program” defined. (NRS 445B.210) “Effective date of 

the program” means the date on which the Administrator approves the program.

 (Added to NAC by Environmental Comm’n, eff. 12-13-93)—(Substituted in revision for

NAC 445.4915) 

Sec. 14. of Petition 94002 subsequently codified as;

NAC 445B.056 “Emergency” defined. (NRS 445B.210) “Emergency” means any situation 

arising from a sudden and reasonably unforeseeable event beyond the control of the owner or 

operator, including an act of God, that requires immediate corrective action to restore normal

2
operation, and that causes the source to exceed an emission limitation contained in the operating 

permit which is based on a specific type of technology. The term does not include the failure to 

comply with emission limitations because of the improper design of the source, the lack of 

preventative maintenance, the careless or improper operation of the source, or any error by the 

operator. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 11-15-94)—(Substituted in

revision for NAC 445.4955) 

Sec. 15. of Petition 94002 subsequently codified as;

NAC 445B.061 “EPA” defined. (NRS 445B.210) “EPA” means the United States 

Environmental Protection Agency. 

 (Added to NAC by Environmental Comm’n, eff. 12-13-93)—(Substituted in revision for

NAC 445.5008) 

Appears as NAC 445B.504 in the Petition. 

NAC 445B.063 “Excess emissions” defined. (NRS 445B.210) “Excess emissions” means any 

emission which exceeds any applicable emission limitation prescribed by NAC 445B.001 to 

445B.3497, inclusive, or that is contained in an operating permit. The averaging time and test 

procedures for determining excess emissions must be as specified in the relevant condition or 

conditions of the operating permit. 

 [Environmental Comm’n, Air Quality Reg. Art. 1 § 1, eff. 8-29-79]—(NAC A 10-22-87; 

12-13-93)—(Substituted in revision for NAC 445.504) 

Sec. 16. of Petition 94002 subsequently codified as; 

NAC 445B.069 “Federally enforceable” defined. (NRS 445B.210) “Federally enforceable”

means enforceable by the Administrator pursuant to any provision of 42 U.S.C. §§ 7401 to 

7671q, inclusive, 40 C.F.R. §§ 52.21 and 51.160 to 51.166, inclusive, or 40 C.F.R. Part 70, or by 

other persons pursuant to 42 U.S.C. § 7604. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 11-15-94; A 3-29-94, eff. 

11-15-94)—(Substituted in revision for NAC 445.5095) 

Sec. 17. of Petition 94002 subsequently codified as;

NAC 445B.070 “Federally enforceable emissions cap” defined. (NRS 445B.210) “Federally

enforceable emissions cap” means a condition of an operating permit containing an emission 

limitation that the holder of the operating permit requested and the Director approved and which

is independent of any applicable requirement or requirements. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 11-15-94)—(Substituted in

revision for NAC 445.5105) 

Sec. 19. of Petition 94002 subsequently codified as;

NAC 445B.084 “Hazardous air pollutant” defined. (NRS 445B.210) “Hazardous air 

pollutant” has the meaning ascribed to it in NRS 445B.140. 

 (Added to NAC by Environmental Comm’n, eff. 12-13-93)—(Substituted in revision for

NAC 445.5305) 

Sec. 20. of Petition 94002 subsequently codified as;

NAC 445B.087 “Increment” defined. (NRS 445B.210) “Increment” has the meaning ascribed 

to it in 40 C.F.R. § 52.21, as adopted in NAC 445B.221. 

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 (Added to NAC by Environmental Comm’n, eff. 12-13-93)—(Substituted in revision for

NAC 445.5335) 

Sec. 23. of Petition 94002 subsequently codified as;

NAC 445B.141 “Preconstruction review” defined. (NRS 445B.210) “Preconstruction review” 

means a review by the Director of all information contained in a Class I-B application, as

required in NAC 445B.308 to 445B.313, inclusive, and 40 C.F.R. § 52.21. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 11-15-94)—(Substituted in

revision for NAC 445.5775) 

Sec. 24. of Petition 94002 subsequently codified as;

NAC 445B.142 “Prevention of significant deterioration of air quality” defined. (NRS 

445B.210) “Prevention of significant deterioration of air quality” has the meaning ascribed to it 

in 40 C.F.R. § 52.21. 

 (Added to NAC by Environmental Comm’n, eff. 12-13-93)—(Substituted in revision for

NAC 445.5795) 

Sec. 25. of Petition 94002 subsequently codified as;

NAC 445B.147 “Program” defined. (NRS 445B.210) “Program” means the program for

issuing operating permits to Class I sources which the Administrator has approved as complying 

with the requirements of 40 C.F.R. Part 70. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 11-15-94)—(Substituted in

revision for NAC 445.5855) 

Sec. 27. of Petition 94002 subsequently codified as;

NAC 445B.154 “Renewal of an operating permit” defined. (NRS 445B.210) “Renewal of an

operating permit” means the process by which a holder of an operating permit applies for and the 

Director reissues the operating permit at the end of its term. 

 (Added to NAC by Environmental Comm’n, eff. 12-13-93)—(Substituted in revision for

NAC 445.5915) 

Sec. 28. of Petition 94002 subsequently codified as;

NAC 445B.156 “Responsible official” defined. (NRS 445B.210) “Responsible official” 

means: 

 1. For a corporation: 

 (a) A president; 

 (b) A vice president in charge of a principal business function; 

 (c) A secretary; 

 (d) A treasurer; or 

 (e) An authorized representative of such a person who is responsible for the overall operation 

of the facility and who is designated in writing by an officer of the corporation and approved in

advance by the Director. 

 2. For a partnership or sole proprietorship, a general partner or the proprietor, respectively. 

 3. For a municipality or a state, federal or other public agency, a ranking elected official or a

principal executive officer, including, for a federal agency, a chief executive officer who has 

responsibility for the overall operations of a principal geographic unit of the agency. 

 4. For an affected source, the designated representative or his alternate, as defined in 42 

U.S.C. § 7651a(26). 

4
 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 11-15-94)—(Substituted in

revision for NAC 445.5925) 

Appears as NAC 445B.630 in the Petition. 

NAC 445B.190 “Stop order” defined. (NRS 445B.210) “Stop order” means a written notice 

by the Director served on a person or persons requiring such persons to cease the activity that the 

Director, pursuant to NAC 445B.277, has determined is in violation of any provision of NAC 

445B.001 to 445B.3497, inclusive, an applicable requirement or any condition of an operating 

permit. 

 [Environmental Comm’n, Air Quality Reg. § 1.63, eff. 11-7-75; renumbered as § 1.184, 

12-4-76]—(NAC A 12-13-93)—(Substituted in revision for NAC 445.630) 

Appears as NAC 445B.649 in the Petition.

NAC 445B.200 “Violation” defined. (NRS 445B.210) “Violation” means a failure to comply 

with any of the provisions of NAC 445B.001 to 445B.3497, inclusive, any applicable 

requirement or any condition of an operating permit. 

 [Environmental Comm’n, Air Quality Reg. § 1.203, eff. 8-28-79]—(NAC A 10-22-87; 

12-13-93)—(Substituted in revision for NAC 445.649) 

Appears as NAC 445B.669 in the Petition. 

NAC 445B.235 Construction or modification: Determination by Director. (NRS 445B.210)

 1. When requested to do so by an owner or operator, the Director will make a determination

of whether action taken or intended to be taken by the owner or operator constitutes construction,

including reconstruction, or modification or the commencement thereof within the meaning of 

NAC 445B.236. 

 2. The Director will respond to any request for a determination under subsection 1 within 30 

days after receipt of the request. 

 [Environmental Comm’n, Air Quality Reg. §§ 2.13.1 & 2.13.2, eff. 12-4-76]—(NAC A

12-13-93)—(Substituted in revision for NAC 445.669) 

Appears as NAC 445B.670 in the Petition. 

NAC 445B.236 Construction or modification: Review of plans. (NRS 445B.210)

 1. When requested to do so by an owner or operator, the Director will review plans for 

construction or modification to provide technical advice to the owner or operator. A separate 

request must be submitted for each construction or modification project. Each request must 

identify the location of such projects and be accompanied by technical information describing 

the proposed nature, size, design and method of operation of each affected facility involved in

the project, including information on any equipment to be used for measurement or control of

emissions. 

 2. Neither a request for a review of plans nor advice furnished by the Director in response to 

such request: 

 (a) Relieves an owner or operator of legal responsibility for compliance with any provision of 

NAC 445B.235 or this section, or of any applicable state or local requirement; or 

 (b) Prevents the Director from carrying out or enforcing any provision of NAC 445B.235 or 

this section, or taking any other action authorized by the Act. 

 [Environmental Comm’n, Air Quality Reg. §§ 2.12.1-2.12.2.2, eff. 12-4-76]—(NAC A

12-13-93)—(Substituted in revision for NAC 445.670) 

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Sec. 30. of Petition 94002 subsequently codified as; 

NAC 445B.326 Operating permits: Assertion of emergency as affirmative defense to action

for noncompliance. (NRS 445B.210, 445B.300)

 1. A holder of an operating permit may assert an affirmative defense to an action brought for 

noncompliance with a technology-based emission limitation contained in the operating permit if 

the holder of the operating permit demonstrates through signed, contemporaneous operating logs 

or other relevant evidence, that: 

 (a) An emergency occurred and the holder of the operating permit can identify the cause of

the emergency; 

 (b) The facility was being properly operated at the time of the emergency; 

 (c) During the emergency, the holder of the operating permit took all reasonable steps to 

minimize excess emissions; and 

 (d) The holder of the operating permit submitted notice of the emergency to the Director

within 2 working days after the emergency. The notice must contain a description of the 

emergency, any steps taken to mitigate emissions, and any corrective actions taken to restore the

normal operation of the facility. 

 2. In any action for noncompliance, the holder of an operating permit who asserts the 

affirmative defense of an emergency has the burden of proof. 

 (Added to NAC by Environmental Comm’n, 12-13-93, eff. 1-11-96; A 10-30-95, eff. 

1-11-96)—(Substituted in revision for NAC 445.7133) 

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SEPTEMBER 30, 1992

1
NEVADA ADMINISTRATIVE CODE SECTIONS 

Adopted September 30, 1992, Effective November 23, 1992

LCB File No. R159-92

Appears as NAC 445.700 in the Petition. 

NAC 445B.283 Violations: Manner of paying fines. (NRS 445B.210, 445B.640)

 1. The amount of the specified fine, in accordance with the schedule of fines for

minor violations, must be submitted within 10 days after service of the notice upon the 

violator. 

 2. Cashier’s checks, certified checks, money orders or personal checks must be made

payable to the State of Nevada and must be sent to the State Environmental Commission, 

333 West Nye Lane, Carson City, Nevada 89710. 

 [Environmental Comm’n, Air Quality Reg. §§ 2.8.5.1 & 2.8.5.2, eff. 11-7-75; A 

12-4-76]—(NAC A 10-22-87; 9-19-90; 11-23-92)—(Substituted in revision for NAC 

445.700) 

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NOVEMBER 18, 1991

1
NEVADA ADMINISTRATIVE CODE SECTIONS 

Adopted November 18, 1991, Effective December 26, 1991 

LCB File No. R132-91 

Sec. 2. of LCB File No. R132-91 subsequently codified as; 

NAC 445B.135 “PM10” defined. (NRS 445B.210) “PM10” means any particulate matter in the 

atmosphere with an aerodynamic diameter less than or equal to a nominal 10 micrometers as 

measured by an approved reference method or equivalent method based on 40 C.F.R. Part 50, 

Appendix J and designated in accordance with 40 C.F.R. Part 53. 

 (Added to NAC by Environmental Comm’n, eff. 12-26-91)—(Substituted in revision for

NAC 445.5655) 

Appears as NAC 445.804 in the Petition. 

NAC 445B.22077 Compliance with regulations. (NRS 445B.210) Any portion of any affected 

facility not listed in NAC 445B.2208 must comply with the remaining portions of NAC

445B.001 to 445B.3497, inclusive. 

 [Environmental Comm’n, Air Quality Reg. Art. 16, eff. 12-4-76]—(NAC A 3-17-86; 

10-18-88; 12-26-91)—(Substituted in revision for NAC 445B.384) 

Sec. 3. of LCB File No. R132-91 subsequently codified as; 

NAC 445B.254 Collection of data concerning air quality in affected area of exceptional 

event. (NRS 445B.210)

 1. The Commission will review the data concerning air quality collected during the period

and in the affected area of the exceptional event to determine whether a person or government, 

governmental agency or political subdivision of a government has complied with the provisions 

of NAC 445B.001 to 445B.3497, inclusive. 

 2. The Commission hereby adopts by reference sections 2, 3, 4.2 and 4.4 of the Guideline on

the Identification and Use of Air Quality Data Affected by Exceptional Events, EPA-450/4-86-

007, published by the Environmental Protection Agency, July 1986. A copy of the publication 

may be obtained from the National Technical Information Service, United States Department of 

Commerce, 5285 Port Royal Road, Springfield, Virginia 22161, for the price of $20. 

 3. The Commission may declare an event an exceptional event if the event complies with any

of the following requirements: 

 (a) For a high wind, an hourly speed equal to or greater than 30 miles per hour or gusts equal 

to or greater than 40 miles per hour with no precipitation or only a trace of precipitation observed 

as scattered drops that do not completely wet or cover an exposed area at a rate of not more than 

0.01 inch per hour. 

 (b) For a forest or wildland fire, an uncontrolled fire in vegetation or related flammable 

material that is destructive to natural resources if the fire burns an area: 

 (1) Equal to or greater than 9 acres and is within 3 miles upwind of a device to monitor air 

quality; or 

 (2) Greater than 9 acres and receptor or dispersion modeling demonstrates that air quality 

in the monitored area was affected by the fire. 

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 (c) For a prescribed burning, a controlled fire of vegetative material that is used to improve

range or forestry resources. Prescribed burning must be limited to those days when the 

meteorological conditions are conducive to maximum dispersion. 

 (d) For a structural fire, any accidental fire involving a building that is at least 600 square feet 

in size and located within 500 meters of a device to monitor air quality. 

 (e) For a high pollen count, a pollen count index above 25 grains/cm2

 or 1,000 grains/m3. 

 (f) For a rerouting of traffic, a temporary deviation or detour of vehicular traffic because of an 

accident, construction or demolition, if the detour lasts for not more than 1 week and the rerouted

traffic is within 500 meters of a device to monitor air quality. 

 (g) For unusual traffic congestion, a condition resulting from a major accident, or an 

obstruction for a short period, such as demolition or construction, if the congestion is not a 

regular occurrence and is located within 500 meters of a monitoring site. 

 (h) For a large gathering of persons, a gathering of more than 10,000 persons and 5,000 cars 

at any one time and at a single location, if the: 

 (1) Unusual traffic congestion is associated with the event; 

 (2) Event occurs less than once a year; and 

 (3) Event is held in a location which is not regularly used for those purposes. 

 (i) For a chemical spill or an industrial accident, emissions that result from accidents such as a 

fire, explosion, power outage, train derailment, vehicular accident, or any combination thereof, if 

the spill or accident is not a regular occurrence. 

 (j) For a stratospheric ozone intrusion, a parcel of air originating in the stratosphere at an 

average height of 12.4 miles entrained directly to the surface of the earth. 

 (k) For a volcanic eruption, the emission or ejection of volcanic materials at the earth’s 

surface from a crater or fissure. 

 (l) For any activity relating to cleanup after a major natural disaster, if the Governor or 

Legislature declares an emergency because of the natural disaster or the area affected by the 

natural disaster has been designated as being eligible for federal assistance. 

 4. If the Commission determines that an event is exceptional, the air quality data collected 

within the period and affected area of the event must be treated in a consistent manner. 

 5. As used in this section, “exceptional event” means an event which is uncontrollable or is 

not expected to occur regularly at a given location. 

 (Added to NAC by Environmental Comm’n, eff. 12-26-91)—(Substituted in revision for

NAC 445.6823) 

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AUGUST 29, 1990

1
NEVADA ADMINISTRATIVE CODE SECTIONS 

Adopted August 29, 1990, Effective September 19, 1990 

LCB File No. R095-90 

Appears as NAC 445.517 in the Petition. 

NAC 445B.073 “Fuel-burning equipment” defined. (NRS 445B.210) “Fuel-burning 

equipment” means: 

 1. Indirect heat transfer fuel-burning equipment which is any device used for the 

combustion of fuel in which heat is transferred from the products of combustion 

indirectly for the production of useful heat or power. 

 2. Direct heat transfer fuel-burning equipment which is any device used for the 

combustion of fuel in which heat is transferred from the products of combustion directly 

for the production of useful heat or power. 

 [Environmental Comm’n, Air Quality Reg. §§ 1.29-1.29.2, eff. 11-7-75; renumbered 

as § 1.85, 12-4-76]—(NAC A 9-19-90)—(Substituted in revision for NAC 445.517) 

2