AIRFLOW DATA
(CFM & TEMPERATRUE RISE vs. EXTERNAL STATIC PRESSURE
NOTES:
•
CFM in charge is without filter(s). Filters do not ship with this furnace, but 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 and medium-speed heating. Installer must adjust blower cooling and heating 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.
•
This chart is for information only. For satisfactory operation, external static pressure should not exceed value shown on the rating plate. The shaded area indicates ranges in excess of maximum static pressure
allowed when heating.
•
The above chart is for U.S. furnaces installed at 0-2000 feet. At higher altitudes, a properly derated unit will have approximately the same temperature rise at a particular CFM, while Esp at the CFM will be
lower.
*MSS96/*CSS96
0.6
0.7
0.8
AC
CFM
RISE
CFM
RISE
CFM
RISE
CFM
RISE
CFM
RISE
CFM
CFM
CFM
HIGH
3.0
1478
N/A
1418
25
1354
26
1290
28
1208
29
1129
1040
930
MED
2.5
1299
27
1265
28
1225
29
1167
30
1112
32
1033
949
841
MED-LO
2.0
1081
33
1064
33
1039
34
997
36
945
38
886
819
722
LOW
1.5
966
37
951
37
925
38
892
40
861
41
808
750
666
HIGH
3.0
1432
37
1374
39
1319
40
1237
43
1157
46
1063
958
854
MED
2.5
1289
41
1250
43
1204
44
1142
47
1066
50
981
897
789
MED-LO
2.0
1080
49
1057
50
1022
52
980
54
926
58
861
785
700
LOW
1.5
967
55
945
56
919
58
879
61
844
63
789
712
632
HIGH
3.0
1620
44
1561
46
1478
48
1401
51
1322
54
1239
1150
1052
MED
2.5
1538
46
1476
48
1401
51
1332
53
1250
57
1166
1083
992
MED-LO
2.0
1446
49
1388
51
1333
53
1258
57
1197
59
1112
1037
937
LOW
1.5
1246
57
1217
58
1165
61
1128
63
1067
N/A
994
938
840
HIGH
4.0
1746
41
1671
43
1589
45
1516
47
1447
49
1371
1295
1160
MED
2.5
1190
60
1179
60
1151
62
1138
62
1090
65
1042
970
879
MED-LO
2.0
894
N/A
877
N/A
867
N/A
870
N/A
863
N/A
831
764
671
LOW
1.5
624
N/A
595
N/A
620
N/A
620
N/A
610
N/A
604
571
519
HIGH
5.0
2233
32
2159
33
2086
34
2024
35
1941
37
1850
1753
1651
MED
4.0
1820
39
1778
40
1742
41
1695
42
1638
43
1551
1485
1384
MED-LO
3.5
1571
45
1535
46
1497
48
1446
49
1402
51
1338
1280
1204
LOW
3.0
1361
52
1333
53
1290
55
1255
N/A
1208
N/A
1171
1104
1051
HIGH
5.0
2157
41
2087
43
2028
44
1953
46
1858
48
1775
1661
1558
MED
4.0
1907
47
1852
48
1800
49
1738
51
1675
53
1605
1514
1410
MED-LO
3.5
1608
55
1580
56
1493
60
1501
59
1440
62
1367
1296
1219
LOW
3.0
1390
N/A
1344
N/A
1326
N/A
1268
N/A
1227
N/A
1194
1132
1071
HIGH
5.0
2204
48
2144
50
2080
51
1991
54
1914
56
1817
1724
1595
MED
4.0
1938
55
1914
56
1849
58
1778
60
1713
62
1645
1548
1454
MED-LO
3.5
1651
65
1624
66
1574
68
1529
70
1475
72
1409
1331
1236
LOW
3.0
1427
75
1382
N/A
1345
N/A
1311
N/A
1272
N/A
1215
1159
1066
HIGH
3.0
1425
25
1345
26
1271
28
1198
30
1138
31
1051
945
864
MED
2.5
1254
28
1218
29
1155
31
1107
32
1040
34
952
869
761
MED-LO
2.0
1082
33
1051
34
1007
35
965
37
910
39
841
770
660
LOW
1.5
889
40
872
41
829
43
815
44
765
46
711
659
585
HIGH
3.0
1348
40
1283
42
1217
44
1151
46
1086
49
1014
931
844
MED
2.5
1188
45
1139
47
1098
49
1039
51
986
54
916
834
758
MED-LO
2.0
1015
53
985
54
945
56
909
59
858
62
804
733
655
LOW
1.5
821
65
814
N/A
788
N/A
765
N/A
720
N/A
677
640
564
HIGH
4.0
1736
41
1613
44
1578
45
1498
47
1409
50
1314
1226
1119
MED
3.5
1657
43
1583
45
1501
47
1441
49
1366
52
1282
1173
1077
MED-LO
3.0
1581
45
1510
47
1443
49
1371
52
1280
56
1199
1110
990
LOW
2.5
1369
52
1313
54
1278
56
1225
58
1147
62
1071
990
888
HIGH
5.0
2018
44
1953
46
1877
47
1788
50
1735
51
1659
1556
1448
MED
4.0
1826
49
1749
51
1660
54
1566
57
1496
59
1415
1335
1220
MED-LO
3.5
1618
55
1539
58
1476
60
1406
63
1340
66
1275
1194
1093
LOW
3.0
1402
63
1354
66
1296
69
1242
N/A
1173
N/A
1108
1042
965
HIGH
5.0
2123
50
2053
52
2000
53
1916
56
1832
58
1739
1646
1561
MED
4.0
1912
56
1844
58
1770
60
1708
62
1619
66
1543
1436
1349
MED-LO
3.5
1684
63
1622
66
1578
68
1503
71
1442
74
1374
1302
1204
LOW
3.0
1493
71
1436
74
1371
N/A
1319
N/A
1264
N/A
1208
1153
1061
0.3
0.4
0.5
0.1
0.2
*CSS960402BN
*CSS960603BN
*CSS960804CN
*CSS961005CN
*CSS961205DN
*MSS960603BN
*MSS960803BN
*MSS960804CN
*MSS960805CN
*MSS961005CN
*MSS961205DN
*MSS960402BN