BLOWER PERFORMANCE SPECIFICATIONS
13
1.
CFM in chart is without filters(s). Filters do not ship with this furnace, but must be provided by the installer.
2.
All furnaces ship as high speed cooling. Installer must adjust blower cooling speed as needed.
3.
For most jobs, about 400 CFM per ton when cooling is desirable.
4.
INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.
5.
The chart is for information only. For satisfactory operation, external static pressure must not exceed value shown on rating plate. The shaded area indicates
ranges in excess of maximum external static pressure allowed when heating. The data for 0.6" w.c. to 0.8" w.c. is shown for air conditioning purposes only.
6
The dashed (---) areas indicate a temperature rise not recommended for this model.
7.
The above chart is for U.S. furnaces installed at 0-4000 feet. At higher altitudes, a properly derated unit will have approximately the same temperature rise at a
particular CFM, while the ESP at that CFM will be lower.
Tons AC
at 0.5"
0.6
0.7
0.8
ESP
CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM
HIGH
3.0
1555
---
1511
---
1459
---
1392
---
1344
25
1279 1201 1120
GMH80453AN**
MED 2.5
1165
28
1123
30
1100
30
1090
30
1048
32
1017
970
903
(MEDIUM)
MED-LO
2.0
927
36
907
37
889
37
863
38
853
39
822
800
746
LOW
1.5
699
47
694
48
668
50
645
51
636
52
592
566
524
HIGH
3.0
1437
36
1310
39
1295
40
1310
39
1273
41
1202 1129 1039
GMH80703AN**
MED
2.5
1127
46
1100
47
1095
47
1075
48
1050
49
1018
967
904
(MEDIUM)
MED-LO
2.0
895
---
917
---
878
---
867
---
853
---
830
786
743
LOW
1.5
694
---
681
---
663
---
640
---
625
---
591
562
522
HIGH
4.0
2234
23
2151
24
2076
25
1990
26
1897
27
1803 1710 1569
GMH80704BN**
MED 3.5
1676
31
1653
31
1648
31
1581
33
1555
33
1492 1414
1.35
(MEDIUM)
MED-LO
3.0
1342
38
1335
39
1321
39
1313
39
1291
40
1261 1215 1149
LOW
2.5
1089
47
1085
48
1078
48
1071
48
1057
49
1040
986
932
HIGH
3.0
1593
42
1561
43
1567
42
1543
43
1493
44
1420 1343 1230
GMH80903BN**
MED 2.5
118/6
56
1160
57
1160
57
1135
58
1118
59
1089 1045
983
(MEDIUM)
MED-LO
2.0
957
---
940
---
937
---
921
---
895
---
861
826
778
LOW
1.5
742
---
710
---
684
---
663
---
635
---
611
578
476
HIGH
4.0
2182
---
2127
31
2056
32
1974
33
1895
35
1809 1715 1588
GMH80904BN**
MED 3.5
1645
40
1628
40
1615
40
1597
41
1541
43
1491 1440 1350
(MEDIUM)
MED-LO
3.0
1320
49
1305
49
1310
49
1310
50
1295
51
1267 1217 1139
LOW
2.5
1063
60
1061
60
1057
61
1056
61
1039
61
1025 1005
948
HIGH
5.0
2334
---
2334
---
2284
---
2135
---
2051
35
1910 1748 1605
GMH80905CN**
MED 4.0
1754
39
1735
39
1728
40
1685
40
1628
42
1551 1469 1346
(MEDIUM)
MED-LO
3.5
1367
47
1380
47
1371
47
1374
48
1335
50
1293 1246 1165
LOW
3.0
1098
58
1109
59
1109
59
1088
60
1066
62
1050
998
916
HIGH
5.0
2481
---
2395
35
2288
37
2217
38
2076
41
1999 1858 1732
GMH81155CN**
MED 4.0
1738
49
1732
49
1709
50
1686
50
1639
52
1585 1492 1385
(MEDIUM)
MED-LO
3.5
1364
62
1378
62
1372
62
1372
62
1350
63
1313 1261 1128
LOW
3.0
1137
---
1142
---
1140
---
1114
---
1090
---
1056
954
860
HIGH
5.0
2554
41
2435
43
2375
44
2240
47
2152
49
2002 1883 1744
GMH81405DN**
MED 4.0
1846
57
1773
59
1762
60
1712
61
1672
63
1583 1526 1442
(MEDIUM)
MED-LO
3.5
1520
69
1500
70
1483
---
1470
---
1435
---
1373 1308 1245
LOW
3.0
1301
---
1274
---
1260
---
1231
---
1207
---
1177 1093
931
BLOWER PERFORMANCE
0.1
0.2
0.3
0.4
0.5
(CFM & Temperature Rise vs. External Static Pressure)
Model
Heating Speed
As Shipped
Motor
Speed
EXTERNAL STATIC PRESSURE (Inches Water Column)
(
)