PRODUCT SPECIFICATIONS
GMNT SERIES
92.6% AFUE
4-Way, Multi-Position
Condensing Gas Furnace
The GMNT multi-position condensing gas
furnace is equipped to be installed in a utility room, attic, basement or closet.
Standard Features
• Corrosion-resistant, 29-4C secondary heat exchanger that
extracts energy from the gas and converts it to usable heat
• Energy saving Hot Surface Ignition system
• Capable of multi-position installation – upflow, downflow
or horizontal
• Completely assembled, factory run-tested furnace for
heating or combination heating/cooling application
• Energy-saving PSC, multi-speed, direct drive blower motor
• Quiet, corrosion-resistant, plastic-induced blower motor
assembly
• Vertical or horizontal venting with 2” PVC for 40k and
60k; 3” PVC for 80k, 100k and 120k
• For direct vent (2 pipe) or non-direct vent (1 pipe)
installations
• All model design certified by ITS to be in compliance
with ANSI Z21.47 and CAN/CGA 2.3 (Canada) safety
standards
• Complies with California NOX Standards
• 40VA transformer for heating and air conditioning control
service
• Tubular heat exchanger (primary)
• Aluminized-steel inshot burners
• Combination redundant gas valve and regulator
• Integrated furnace control with diagnostics
• Blower door safety switch
• Multiple-flame roll-out switches
• Outlet air limit switch
• Pressure switch for proof of combustion air
• Drain kit contains vent screens, drain trap, hoses and
clamps
SS-312D
Cabinet Construction
• Heavy-gauge, reinforced, wrap-around insulated steel
cabinet with durable baked enamel finish
• Bottom or side air inlet
• Completely insulated cabinet
• Convenient left- or right-hand connection for gas, electric
service, combustion air and vent
• Removable solid bottom block-off
Optional Equipment
• L.P. Conversion Kit (LPT-01)
• Concentric Vent Kit (CVK-00)
www.goodmanmfg.com
12/03
PRODUCT SPECIFICATIONS
Performance Ratings
Model
Natural Gas Input
BTUH
Natural Gas
Output BTUH
Propane Gas
Input BTUH
Propane Gas
Output BTUH
DOE AFUE
Temperature Rise
(°F)
GMNT040-3B
GMNT060-3B
GMNT080-4B
GMNT100-4B
GMNT120-5D
40,000
60,000
80,000
100,000
120,000
37,000
55,000
73,500
92,000
110,000
37,000
55,000
73,000
92,000
111,000
34,000
51,000
67,000
85,000
102,000
92.6
92.6
92.6
92.6
92.6
25 – 55
35 – 65
35 – 65
40 – 70
40 – 70
Specifications
Circulator Blower
Model
Size
(D x W)
HP
GMNT040-3B
GMNT060-3B
GMNT080-4B
GMNT100-4B
GMNT120-5D
10” x 6”
10” x 6”
10” x 8”
10” x 10”
10” x 10”
1/3
1/3
1/2
1/2
3/4
Filter Size (in.2)
Vent
Speeds Diameter1
4
4
4
4
4
2”
2”
3”
3”
3”
Perm.
Disp.
290
290
385
385
480
580
580
770
770
960
Minimum
Circuit
Ampacity2
(amps)
Maximum
Overcurrent
Protection3
(amps)
Shipping Weight
(lbs.)
8.1
8.1
12.5
12.5
14.7
15
15
15
15
15
170
180
205
225
265
1) Vent and combustion air diameters may vary depending on vent length. Refer to furnace installation instructions.
2) Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.
3) Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.
NOTES:
1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single-phase electrical supply.
2. Gas Service Connection 1⁄2” FPT.
3. IMPORTANT: It is required to size fuses and wires properly and make electrical connections in accordance with
the National Electrical Code and/or all existing local codes.
Dimensions
COMB. AIR INLET
COMB. AIR INLET
GAS INLET
GAS INLET
VENT
VENT
LOW VOLTAGE
LOW VOLTAGE
ELEC.
ELEC.
Model
A
B
Combustible Floor Base
GMNT040-3B
GMNT060-3B
GMNT080-4B
GMNT100-4B
GMNT120-5D
14”
14”
171⁄2
21”
241⁄2
121⁄2”
121⁄2”
16”
191⁄2”
23”
SBT14
SBT14
SBT17
SBT21
SBT24
Clearances from Combustible Materials
Sides
1”
Rear
0”
Front*
3”
Vent
0”
Approved for line contact in the horizontal position.
*36” clearance for serviceability recommended.
2
Top
1”
PRODUCT SPECIFICATIONS
Blower Performance Specifications
CFM & Temperature Rise vs. External Static Pressure
Model
(Heating
Speed as
Shipped)
Motor
Speed
Tons AC
@ 0.5”
ESP
GMNT040-3B
(MED-LO)
HIGH
MED
MED-LO
LOW
GMNT060-3B
(MED)
External Static Pressure, (Inches Water Column)
0.6
0.7
0.8
CFM
Rise
CFM
Rise
CFM
Rise
CFM
Rise
CFM
Rise
CFM
CFM
CFM
3.0
2.5
2.0
1.5
1,395
1,132
905
718
------30
38
47
1,340
1,103
913
702
25
31
37
49
1,282
1,089
897
693
27
31
38
49
1,227
1,048
880
668
28
33
39
51
1,163
1,005
854
640
29
34
40
53
1,096
954
814
617
1,015
897
762
576
940
817
701
526
HIGH
MED
MED-LO
LOW
3.0
2.5
2.0
1.5
1,352
1,084
894
680
37
47
57
--------
1,293
1,081
860
666
39
47
59
--------
1,239
1,054
867
658
41
48
58
--------
1,185
1,016
847
635
43
50
60
--------
1,126
971
807
607
45
52
63
--------
1,062
921
777
575
980
867
734
548
907
796
688
502
GMNT080-4B
(MED-LO)
HIGH
MED
MED-LO
LOW
4.0
3.5
3.0
2.5
1,911
1,686
1,419
1,153
35
40
48
59
1,823
1,623
1,385
1,147
37
42
49
59
1,747
1,531
1,350
1,126
39
44
50
60
1,638
1,473
1,306
1,099
41
46
52
62
1,546
1,412
1,230
1,069
44
48
55
63
1,464
1,342
1,197
1,015
1,355
1,247
1,131
957
1,264
1,160
1,040
879
GMNT100-4B
(MED)
HIGH
MED
MED-LO
LOW
4.0
3.5
3.0
2.5
2,222
1,734
1,426
1,231
38
49
59
69
2,146
1,717
1,405
1,186
40
49
60
--------
2,035
1,672
1,407
1,130
42
51
60
--------
1,954
1,618
1,357
1,087
43
52
62
--------
1,810
1,547
1,327
1,029
47
55
64
--------
1,671
1,463
1,266
945
1,533
1,354
1,203
870
1,422
1,257
1,120
787
GMNT120-5D
(MED)
HIGH
MED
MED-LO
LOW
5.0
4.0
3.5
3.0
2,407
1,825
1,493
1,274
43
57
69
--------
2,329
1,764
1,486
1,285
44
59
70
--------
2,214
1,703
1,453
1,251
47
61
---------------
2,088
1,646
1,433
1,224
49
63
---------------
1,994
1,598
1,385
1,182
52
65
---------------
1,806
1,486
1,034
1,035
1,645
1,336
1,023
916
1,445
1,058
900
784
1.
2.
3.
4.
5.
6.
7.
0.1
0.2
0.3
0.4
0.5
CFM in chart is without filter(s). Filters do not ship with this furnace, but they must be provided by the installer. If the furnace requires two
return filters, this chart assumes both filters are installed.
All furnaces ship as high-speed cooling. Installer must adjust the blower cooling speed as needed.
For most jobs, about 400 CFM per ton when cooling is desirable.
INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING
PLATE.
The chart is for information only. For satisfactory operation, external static pressure must not exceed value shown on the rating plate.
The shaded area indicates ranges in excess of maximum static pressure allowed when heating.
The dashed (----) areas indicate a temperature rise not recommended for this model.
The above chart is for U.S. furnaces installed at 0-2000 feet. At higher altitudes, a properly de-rated unit will have approximately the same
temperature rise at a particular CFM, while ESP at the CFM will be lower.
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PRODUCT SPECIFICATIONS
Cased U Coil Application Options
Coil Model
Number
Furnace Model
Number
GMNT040-3
GMNT060-3
GMNT080-4
GMNT100-4
GMNT120-5
Furnace Width
14”
171⁄2”
21”
241⁄2”
Coil Width
U-18
U-29
U-30
U-31
U-32
U-35
U-36
U-42
U-47
U-49
U-59
U-60
U-61
U-62
14”
14”
171⁄2”
14”
171⁄2”
14”
171⁄2”
171⁄2”
171⁄2”
21”
21”
241⁄2”
241⁄2”
21”
X
X
X(1)
X
X(1)
X
X(1)
X(1)
X(2)
X(2)
X(2)
X(2)
X
X(1)
X(1)
X(1)
X(2)
X(2)
X(1)
X(1)
X(2)
X(2)
X(2)
(1) Using the factory installed bottom cabinet filler plates
(2) Discard bottom cabinet filler plates
Due to the rating mix/match of various coils with outdoor units, it is important to match the furnace airflow for the
total system capacity. Refer to furnace, heat pump and/or condensing unit specification sheets.
Goodman Manufacturing Company, L.P., reserves the right to discontinue, or change at any time, specifications or designs without notice or without incurring obligations.
Copyright © 2003 Goodman Manufacturing Company, L.P. • Houston, Texas • Printed in the USA. • Goodman products are made proudly in the USA.
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