7-G-i

APPENDIX 7-G. REDUCED SET OF FURNACE FAN MODELS AND 

CHARACTERISTICS

TABLE OF CONTENTS

7-G.1 INTRODUCTION .................................................................................................7-G-1

7-G.2 REDUCED SET OF FURNACE FAN MODELS DATABASE..........................7-G-1

7-G.2.1 Purpose...................................................................................................................7-G-1

7-G.2.2 Data Set Development Background.......................................................................7-G-1

7-G.3 DECODING OF MANUFACTURER MODEL NUMBERS...............................7-G-2

7-G.4 REDUCED FURNACE MODEL CHARACTERISTICS ....................................7-G-6

LIST OF TABLES

Table 7-G.3.1 Example Furnace Model Number Description ....................................7-G-2

Table 7-G.3.2 Amana Model Number Description.....................................................7-G-2

Table 7-G.3.3 Armstrong Model Number Description...............................................7-G-3

Table 7-G.3.4 Carrier Model Number Description.....................................................7-G-3

Table 7-G.3.5 Ducane Model Number Description ....................................................7-G-3

Table 7-G.3.6 ECR International (Olsen) Model Number Description ......................7-G-3

Table 7-G.3.7 Goodman Model Number Description.................................................7-G-4

Table 7-G.3.8 ICP Model Number Description ..........................................................7-G-4

Table 7-G.3.9 Lennox Model Number Description ....................................................7-G-4

Table 7-G.3.10 Nordyne Model Number Description ..................................................7-G-4

Table 7-G.3.11 Rheem Non-Condensing Model Number Description.........................7-G-5

Table 7-G.3.12 Rheem Condensing Model Number Description.................................7-G-5

Table 7-G.3.13 Texas Furnace Model Number Description.........................................7-G-5

Table 7-G.3.14 Thermo-Pride Furnace Model Number Description............................7-G-5

Table 7-G.3.15 Trane/American Standard Model Number Description.......................7-G-6

Table 7-G.3.16 York Furnace Model Number Description ..........................................7-G-6

LIST OF FIGURES

Figure 7-G.4.1 Number of Non-Weatherized Gas Furnace Models by Input 

Capacity ...............................................................................................7-G-7
7-G-1

APPENDIX 7-G. REDUCED SET OF FURNACE FAN MODELS AND 

CHARACTERISTICS

7-G.1 INTRODUCTION

This appendix presents the approach for developing a reduced set of furnace fan models 

and the resulting furnace characteristics.

7-G.2 REDUCED SET OF FURNACE FAN MODELS DATABASE

7-G.2.1 Purpose 

The Reduced Set of Furnace Models was developed to identify actual unique furnace 

models which represent units with different design characteristics and to expand the AHRI

directory data for each unique furnace model by adding information provided in the 

manufacturers' product literature. One application of the reduced set was to develop furnace fan 

curves which were used in the life-cycle cost (LCC) analysis. 

The March 2012 AHRI Directory1 lists more than 6,000 non-weatherized gas furnace 

models. Many models represent essentially identical units which differ only in brand name. The 

database of furnace models described here (referred to as the reduced set of furnace models or 

simply the reduced set) represents non-repetitive furnace models only. After examining the 

AHRI Directory database, the Department determined that about 1,450 models may be 

considered sufficiently different to be listed as unique models. Similar approach was used to 

develop the reduced set of other furnace fan product classes. See the LCC spreadsheet (“Models 

Directory” worksheet) for a complete listing of models used for each furnace fan product class.

Once the reduced set was identified, the Department examined the manufacturer’s 

product literature and added additional data including the airflow at different static pressures, 

power for the blower, blower motor type, blower wheel dimensions, furnace dimensions, low fire 

heating input and output capacity for modulating furnaces, and delay times.

7-G.2.2 Data Set Development Background

In 2002, DOE began to develop a database of product specifications (such as different 

design characteristics) for residential furnaces currently sold in the U.S. A preliminary version 

of the reduced set database was completed at the end of 2002 and released with the ANOPR.2

 In 

2005, during the NOPR phase of the rulemaking, an update version of the database was 

published3 and a final version was published in 2007.4 This current version updates the past 

version of the data as well as adds additional furnace fan product classes. 
7-G-2

7-G.3 DECODING OF MANUFACTURER MODEL NUMBERS

The Department used manufacturer model numbers, among other furnace characteristics, 

to determine nominal airflow capacity. Manufacturers often code furnace specifications into 

their model numbers. This appendix illuminates the coding of different manufacturer model 

numbers.

An Amana model number is shown as an example of how manufacturers code furnace 

characteristics. Table 7-G.3.1 shows the Amana model number “GUID045CA30.” The first row 

of the table shows the model number broken into eight cells. The fifth, sixth, and seventh 

characters of the model number are grouped together. The tenth and eleventh characters are 

grouped together. The second row gives an explanation for each character or group of 

characters. Row three deciphers the character or group. Deciphering the model number shows 

that this Amana furnace model is an upflow gas furnace with induced draft, a nominal output of 

45K Btuh, that it is not NOx certified, and has a nominal airflow capability appropriate for a 

three-ton air conditioner.

Table 7-G.3.1 Example Furnace Model Number Description

G U I D 045 C A 30

Product 

Type

Supply Type Furnace 

Type

Model 

Features

Nominal 

Input 

(kBtu/h)

Design 

Series

Additional 

Features

Nominal 

AC Size

G: Gas 

Furnace

U: Upflow I: Induced 

Draft 

(80%)

D: Air 

Command 

80 SV 

(Category I 

Venting)

045 C: Third 

Series

A: Standard 

Unit (not 

NOx 

certified)

30: 3 Tons

All manufacturers have similar coding schemes for their furnace model numbers. Table 

7-G.3.2 to Table 7-G.3.16 show model numbers from the major manufacturers and an 

explanation of their conventions.

Table 7-G.3.2 Amana Model Number Description

A M S 8 070 3 A N A

Brand Air Flow 

Direction

Description AFUE Nominal Input 

(kBtu/h)

Max

CFM 

@0.5"

ESP

Cabinet

Width

NOx Revision

A = Amana

B = Distinctions

G = Goodman

M: Upflow/

Horizontal

D: Dedicated

Downflow

C: Downflow/

Horizontal

H: Hi Air 

Flow

S: SingleStage/

MultiSpeed

V:TwoStage/

VariableSpeed

8: 80%

9: 90%

045

070

090

115

140

3:1,200

4:1,600

5:2,000

A:14"

B:17.5"

C:21"

D:24.5"

N:Natural

Gas

X:Low

NOx

A: Initial

Revision

B: First

Revision

C: Second

Revision
7-G-3

Table 7-G.3.3 Armstrong Model Number Description

G 1N 80 A H 100 D 20 B 1A

Product 

Family

Furnace Type Nominal 

AFUE

Series Configuration Heating 

Input x 

1000

(btu/h)

Motor Type Nominal 

Maximum 

CFM x 100

Cabinet 

Width

Low 

NOx 

Model

Revisio

n

G=Gas 

Furnace

1N = Single-Stage Heat, 

Non-Direct Vent

1D = Single-Stage Heat, 

Direct Vent

2D = Two-Stage Heat, 

Direct Vent

80 AFUE

93 AFUE

95 AFUE

A Series

B Series

H = Horizontal

U = Upflow

T = Upflow/

Horizontal

R = Downflow/

Horixontal

50

75

100

125

150

D = Direct 

Drive

12=1200

14=1400

16=1600

20=2000

A = 13-1/2

B = 17

C = 20-1/2

L = Low 

NOx 

Model

1A

Table 7-G.3.4 Carrier Model Number Description

58DLA 045 100 08

Furnace Series Configuration/Type Input Capacity

(kBtu/h)

Series Number Nominal Cooling Size (Airflow)

(400 CFM per 12,000 btu/h)

58DLA = Deluxe 4-Way Multipoise

58DLX = Low NOx version

58CVA = Variable Speed 4-Way Multipoise

58CVX = Low NOx version

58CTA = Two-Stage 4-Way Multipoise

58CTX = Low NOx version

045 = 44,000

070 = 66,000

090 = 88,000

110 = 110,000

135 = 132,000

155 = 154,000

100 Series 08 = 800 CFM

12 = 1200 CFM

14 = 1400 CFM

16 = 1600 CFM

20 = 2000 CFM

22 = 2200 CFM

Table 7-G.3.5 Ducane Model Number Description

MGPA 075 B 4 B

Furnace Family Input Capacity

(kBtu/h)

Series Nominal Cooling 

Capacity

(tons)

Revision

MGPA = Fits-All 80 AFUE

FPBB = Horizontal 80 AFUE

DPGB = Downflow 80 AFUE

CMPB = Fits-All 92 AFUE (Downflow)

CMPU = Fits-All 92 AFUE (Upflow)

CMPV = Fits-All 92 AFUE variable speed

050

075

100

125

A

B

C

U

3

4

5

B

Table 7-G.3.6 ECR International (Olsen) Model Number Description

GTM 50

Furnace Family Input Capacity

(kBtu/h)

GTM = Med Efficiency Gas Furnace (80% AFUE)

GTH = High Efficiency Gas Furnace (95% AFUE)

50

70

85

100
7-G-4

Table 7-G.3.7 Goodman Model Number Description

GMNT 040 3

Unit Type Input Capacity 

(Btu/h)

Nominal Cooling Capacity

(tons)

GMNT = Multi-position gas furnace 040 = 40,000 Btu/h

060 = 60,000 Btu/h

080 = 80,000 Btu/h

100 = 100,000 Btu/h

120 = 120,000 Btu/h

3 = 3 tons

4 = 4 tons

5 = 5 tons

Table 7-G.3.8 ICP Model Number Description

N 9 MP 2 075 F 12 A #

Brand Identifier Model Identifier Installation Configuration Major Design Feature Heating 

Input 

(btu/h)

Cabinet 

Width 

(inches)

Cooling 

Airflow

Marketing 

Digit

Engineering 

Rev.

N = Non-Brand 

Specific 

(Generic)

T = Tempstar

8 = NonCondensing

9 = Condensing

MP = Multiposition

UP = Upflow

DN = Downflow

UH = Uplfow/ Horizontal

HZ = Horizontal

DH = Downflow/ 

Horizontal

1 = One pipe

2 = Two pipe

D = 1 or 1 pipe

L = Low Nox

N = Single-Stage

P = PVC Vent

T = Two-Stage

V = Variable Speed

050

075

080

100

125

B = 15.5"

J = 22.8"

F = 19.1"

L = 24.5"

08 = 800

12 = 1200

14 = 1400

16 = 1600

20 = 2000

Denotes 

minor 

change

Denotes 

minor 

change

Table 7-G.3.9 Lennox Model Number Description

G 40 UH 24 A 045 X

Unit Type Series Configuration Nominal AddOn Cooling 

Capacity

Cabinet Width Heating Input

(btu/h)

CA emission 

requirements

G = Gas 

Furnace

40 = Merit Series 80%

50 = Elite 80%

60 = Two-Stage 80%

UH = Upflow/Horizontal

DF = Downflow/Horizontal

24 = 2 Tons

36 = 3 Tons

48 = 4 Tons

60 = 5 Tons

A = 14-1/2

B = 17-1/2

C = 21

D = 24-1/2

045 = 44,000

070 = 66,000

090 = 88,000

110 = 110,000

135 = 132,000

155 = 154,000

X = meets 

California NOx 

standards

Table 7-G.3.10 Nordyne Model Number Description

G 6 R A 144 C 20 C

Furnace 

Fuel Type

Design 

Series

Furnace Type Furnace Configuration Heating Input

(btu/h)

Certification 

Type

Nominal CFM Cabinet 

Width

G, FG, KG, 

L = Gas

6 or 1 R = Residential

T = Residential, TwoStage

A = Upflow

C = Upflow, Condensing

K = Downflow

L = Downflow, condensing

045 = 45,000

060 = 60,000

072 = 72,000

096 = 96,000

120 = 120,000

144 = 144,000

C = US/Canada

N = NOx US

08 = 800 CFM

12 = 1200 CFM

V = Variable Speed

A = 14-1/4

B = 19-3/4

C = 22-1/2
7-G-5

Table 7-G.3.11 1Rheem Non-Condensing Model Number Description 

R G P J 07 E A U E R

Brand 

Identifier

Fuel Type NonCondensing 

Furnace Type

Design Series Heating 

Input 

(kbtu/h)

Ignition 

Type 

Variations Blower 

Size

Cooling 

Designation 

(CFM)

Natural Gas 

Fuel Code

R = Rheem

U = Ruud

W = 

Weatherking

G = Natural 

Gas

D = Upflow

L = Downflow

P = Upflow/ 

Horizontal

J = Acclaim

A = Acclaim II

K = Criterion II 

Plus 2

N = Classic 

Series

L = Criterion II 

Plus 2 LXE

04 = 45

05 = 50

06 = 67.5

07 = 75

10 = 100

12 = 125

15 = 150

E = Electric 

Ignition

N = Electric 

Ignition -

NOx Model

A = Standard

B= Wide 

Cabinet

U = 11x6

M = 11x7

R = 11x10

S = 500-1200

E = 1100-1300

G = 1450-1750

J = 1900-2075

R = US

A = Canada

Table 7-G.3.12 Rheem Condensing Model Number Description

R G T J 07 E M A E S

Brand 

Identifier

Fuel Type Condensing 

Furnace Type

Design Series Heating 

Input 

(kbtu/h)

Ignition 

Type 

Blower 

Size

Variations Cooling 

Designation 

(CFM)

Natural Gas 

Fuel Code

R = Rheem

U = Ruud

W = 

Weatherking

G = Natural 

Gas

T = 

Downflow/ 

Horizontal

R = Upflow

M = Upflow 

Modulating 

J = Classic 90

A = Classic 90 

Plus

D = Classic 90 

Plus Modulating

04 = 45

06 = 60

07 = 75

09 = 90

10 = 105

12 = 120

E = Electric 

Ignition

N = Electric 

Ignition - 

(Low NOx)

M = 11x7

R = 11x10

Z = 12x11 

Y = 12x7

A = 

Standard

B= Wide 

Cabinet

C = 

Single/Mult

i Zone

E = 1100-1300

G = 1500-1700

J = 1900-2100

K = 600-1200

M = 1200-2000

S = US

B = Canada

Table 7-G.3.13 Texas Furnace Model Number Description

ABA 040 NH 3 R

Furnace Family Heating Input (kbtu/h) Series Nominal Cooling Capacity

(tons)

Version

ABA = 80 Plus

CSA = 90 Plus (Downflow)

VSA = 90 Plus (Upflow)

040

060

080

100

120

140

NH 2

3

4

5

6

R = Standard

RX = Low Nox

RH = High Altitude

Table 7-G.3.14 Thermo-Pride Furnace Model Number Description

MHA 50 N

Furnace Family Heating Input (kbtu/h) Furnace Fuel Type

MHA1 = Comfort 80+% Mid-Efficiency Gas Fired Furnace

MHA = Comfort 80+% Mid-Efficiency Gas Fired Furnace

CHX1 or CDX1 = Premiere Series Two-Stage Gas Fired Furnace

CHB1 or CDB1 = 90+% High-Efficiency Gas Fired Furnace

50

75

100

125

N = Natural Gas

P = Propane
7-G-6

Table 7-G.3.15 Trane/American Standard Model Number Description

T U Y 080 R 9 V3 V 0

Brand Identifier Furnace 

Configuration

Type Heating 

Input 

(Kbtu/h)

Major Design 

Change

Power 

Supply 

and Fuel

Airflow Capacity 

for Cooling

(400 CFM/Ton)

Minor Design 

Change or

Service 

Digit

T = Trane

A = American 

Standard

U = Upflow/ 

Horizontal

D = Downflow/

Horizontal

C = Condensing

D = Induced Draft

E = Electronic Ignition

X = Direct Vent 

Condensing

Y = Direct Vent 

Condensing Variable 

Speed

040

060

080

100

120

140

C = Single-Stage

R = Two-Stage

All other = 

Standard system

115 

Volt/

Natural 

Gas

3 = 3 Tons

V3 = 11⁄2-3 Tons, 

Variable Speed 

Motor (ICM)

V4 = 2 - 4 Tons, 

Variable Speed 

Motor (ICM)

V5 = 3 - 5 Tons, 

Variable Speed 

Motor (ICM)

H = Upflow/ 

Horizontal

V = Variable 

Speed Motor

0

Table 7-G.3.16 York Furnace Model Number Description

P4 HU A 12 N 032 01

Series Furnace 

Configuration

Cabinet Size Width Design Series Output Capacity

(kbtu/h)

Revision

P4 HU = Upflow 

Horizontal

A = 14-1/2

B = 17-1/2

C = 21

D = 24-1/2

12 = 1200 CFM

16 = 1600 CFM

20 = 2000 CFM

N 

L = Low NOx

032

048

064

080

100

115

130

01 = first 

revision

02 = second 

revision

7-G.4 REDUCED FURNACE MODEL CHARACTERISTICS

Input capacity for furnaces and boilers is an essential component used in the LCC 

analysis. The basic methodology for obtaining the generic input capacities involves using the 

reduced set of models for each product class and then using a histogram of input capacities to 

pick the input capacities which are the most common. Figure 7-G.4.1 shows the number of nonweatherized gas furnace models by input capacity for non-weatherized gas furnaces. A similar 

approach was used for other furnace fan product classes (See LCC spreadsheet “Furnace and AC 

Specs” worksheet for all the input capacity and AFUE distributions).
7-G-7

Figure 7-G.4.1 Number of Non-Weatherized Gas Furnace Models 

by Input Capacity

0

500

1000

1500

2000

2500

3000

2030405060708090

100110120130140150160

Input Capacity (kBtu/h)

Count
7-G-8

REFERENCES

1. AHRI, AHRI Directory March 2012, 2012. 

2. U.S. Department of Energy-Office of Building Technologies, Technical Support 

Document: Energy Conservation Program for Consumer Products: Energy Conservation 

Standards for Residential Furnaces and Boilers - ANOPR Version, 2003. U.S. 

Department of Energy. Washington, DC. Report No. LBNL-53984. 

<http://www.eere.energy.gov/buildings/appliance_standards/residential/furnaces_boilers.

html>

3. U.S. Department of Energy-Office of Energy Efficiency and Renewable Energy. Energy 

Conservation Program for Consumer Products, Technical Support Document: Energy 

Conservation Program for Consumer Products; Residential Furnaces and Boilers - NOPR 

Version, 2005. Washington, D.C. 

<http://www.eere.energy.gov/buildings/appliance_standards/residential/furnaces_boilers.

html>

4. U.S. Department of Energy-Office of Energy Efficiency and Renewable Energy. Energy 

Conservation Program for Consumer Products, Technical Support Document: Energy 

Conservation Program for Consumer Products; Residential Furnaces and Boilers – Final 

Rule Version, 2007. Washington, D.C. 

<http://www.eere.energy.gov/buildings/appliance_standards/residential/furnaces_boilers.

html>