Defining Innovation.
forward curved inline duct blowers
TYPE DBS (Single) | DBT (Twin)
BULLETIN 4220
January 2011
Duct Blowers
General Information
Twin City Fan’s belt driven DBS (single) and DBT (twin)
duct blowers are specifically designed for duct applications handling relatively clean air, including supply,
exhaust and return air systems. These fans offer high
efficiency and quiet operation in a compact design that
can be mounted in bottom horizontal or top horizontal
positions. Duct collars are provided for easy mounting
connections. The units can be easily serviced through access panels without removing duct connections.
Duct blowers feature forward curved centrifugal
wheels which produce high air volumes at low speeds.
All wheels are statically and dynamically balanced. Units
are manufactured under strict quality assurance standards to ensure cataloged performance and years of
trouble-free operation.
Capabilities
Model DBS
DBS and DBT fans are each available in 8 sizes, ranging
from 8" through 20" wheel diameters.
Performance capabilities include a broad capacity
range from 400 to 31,500 CFM and static pressure
capabilities to 4 inches w.g.
Construction Features
• Housing assembly features heavy-gauge galvanized
steel construction. Housing sides and scroll are spot
welded on sizes 8"-18". Size 20" housing is lock
seam design.
• Duct collars provide ready attachment to ductwork.
• Removable side panels provide easy access for service
and maintenance without the need to remove duct
connections. Complete removal of the power assembly
is also possible through side access panels.
• Forward curved, galvanized steel wheels are statically
and dynamically balanced to assure long life and
quiet operation.
• Heavy-duty cast iron adjustable pulleys to permit
speed variation.
• All models are furnished with deep groove, self aligning ball bearings, permanently lubricated and sealed.
Twin City Fan & Blower certifies that
the DBS and DBT models shown
herein are licensed to bear the AMCA
Seal. The ratings shown are based
on tests and procedures performed
in accordance with AMCA Publication
211 and AMCA Publication 311 and
comply with the requirements of the
AMCA Certified Ratings Program.
Model DBT
All DBS and DBT models are UL/
cUL 705 listed, for electrical, File No.
E158680.
©2011 Twin City Fan Companies, Ltd. All rights reserved throughout the world.
Bulletin illustrations cover the general appearance of Twin City Fan & Blower products at the time of publication
and we reserve the right to make changes in design and construction at any time without notice.
2
Twin City Bulletin 4220
Construction Features
Bearings
Scroll Fan
Housing
Duct Collars
Drive
Assembly
Drive
Frame
Wheel Construction
Double width, double inlet forward curved centrifugal
fan wheels are constructed of galvanized steel with FC
blades tab locked into the end rings and a heavy duty
steel hub is bolted to the wheel.
3
Forward Curved
(FC) Wheel
Bearings
Deep groove, self aligning ball bearings are permanently
lubricated and sealed. The bearing is mounted inside a
rubber isolator and attached directly to the fan housing
with a three prong (sizes 8-12) or a four prong (sizes 1420) mount. Twin blowers (DBT) have three bearings.
Twin City Bulletin 4220
Accessories
Filter Box
Intake
Weather
Hood
Isolators
(Hanging Spring Shown)
Duct Blower
Removable
Side Panels
(Standard)
Inlet
Screen
Backdraft Dampers
Backdraft dampers, with automatic or motorized operation, feature felt-edged damper blades for quiet operation. Damper frames are constructed of 20-gauge galvanized steel and blades are constructed of 26-gauge
aluminum. Dampers are channel frame and ship loose
for field mounting in duct work.
Motorized dampers are recommended for low CFM
applications to assure unrestricted airflow. Motorized
dampers are available with 115, 208, 230,
24 voltservice.
Bottom Horizontal
Discharge (Standard)
Inlet Screen
An inlet screen is available to enclose the motor and
drive compartment, protecting personnel and preventing
birds from gaining entry to the fan and building. Screen
attaches to fan or filter box, if ordered.
Insulated Housing
A one-inch thick layer of fiberglass insulation on the
interior of the fan housing is available to provide protection against condensation and to aid in noise reduction.
Neoprene coated or foil face insulation is available.
Intake Weather Hood
Filter Box
A filter box containing two inch wire mesh, removable
and washable filters is available for attachment to the
fan inlet side. The filter box is constructed of galvanized
steel, with duct collars for easy mounting and removable side panels for easy filter cleaning or replacement.
Disposable paper filters are also available. One inch filters are available on either type. For filter box pressure
drops contact factory. See page 21 for dimensional data.
Multiple Discharge Positions
Models DBS and DBT are built with the fan outlet in a
bottom horizontal discharge (BHD) position as standard.
Units can be built with a top horizontal discharge (THD)
position for installations which require it.
Intake hoods are available to keep rain and snow from
entering the building. Hood includes a galvanized birdscreen, which mounts to fan housing at inlet or to filter
box, if ordered.
Disconnect Switches
NEMA-rated switches are available for positive electrical
shutoff of the fan and the protection of service personnel. Switches can be shipped loose or mounted and
wired.
Vibration Isolators
Spring or neoprene type vibration isolators are available
for ceiling suspension or floor mounting.
Special Coatings
Duct blowers often require special coatings for protective and decorative purposes. Available coatings include
air-dried enamel, air-dried epoxy, and Heresite (air-dried
phenolic). Contact your Twin City Fan representative for
more information on available coatings and colors.
Top Horizontal
Discharge
4
Twin City Bulletin 4220
Performance Data - DBS (Single)
080 DBS
CFM
OV
400
519
500
649
600
779
700
909
800
1039
900
1169
1000
1299
1100
1429
1200
1558
1300
1688
1400
1818
1500
1948
1600
2078
1700
2208
1800
2338
1900
2468
0.125"
RPM
BHP Sone
475
0.02
1.6
512
0.03
2.0
556
0.04
3.0
602
0.06
3.8
646
0.08
4.7
691
0.10
5.6
740
0.14
6.5
790
0.17
7.5
842
0.22
8.3
895
0.27
9.7
949
0.32
10.8
1004
0.39
11.8
1060
0.47
13.1
1116
0.55
14.1
1173
0.65
15.4
1230
0.76
16.6
0.25"
RPM
BHP Sone
0.375"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
0.50"
0.625"
0.75"
1.00"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
682
0.06
3.8
721
0.08
4.2
763
0.10
5.1
810
0.14
6.0
855
0.17
6.8
899
0.21
7.8
944
0.26
8.9
991
0.31
10.0
1039
0.37
11.2
1089
0.44
12.7
1140
0.52
13.9
1192
0.61
15.2
1245
0.71
16.5
1299
0.82
18.2
825
0.10
5.4
860
0.13
5.8
900
0.16
6.4
944
0.20
7.3
991
0.25
8.1
1036
0.30
9.1
1081
0.36
10.2
1125
0.42
11.7
1170
0.49
12.9
1217
0.58
14.2
1266
0.67
15.7
1315
0.77
17.0
1366
0.89
18.4
951
0.15
6.9
983
0.19
7.3
1023
0.23
7.8
1065
0.28
8.7
1111
0.34
9.8
1158
0.40
10.8
1203
0.47
11.9
1247
0.55
13.2
1291
0.63
14.4
1336
0.73
15.9
1382
0.83
17.5
1431
0.95
18.6
0.25"
RPM
BHP Sone
0.375"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
0.50"
0.625"
0.75"
1.00"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
608
0.08
4.2
630
0.10
4.7
652
0.13
5.3
677
0.16
6.4
707
0.20
7.4
741
0.24
8.7
778
0.30
10.1
818
0.36
11.4
860
0.44
12.7
904
0.53
13.8
948
0.62
15.3
994
0.74
16.8
1040
0.86
18.3
1086
1.00
19.6
1133
1.15
21
736
0.13
5.9
761
0.16
6.3
781
0.20
6.9
804
0.24
7.7
830
0.29
9.0
860
0.35
10.1
893
0.42
11.6
928
0.49
13.0
966
0.58
14.4
1006
0.68
16.0
1049
0.80
17.2
1092
0.92
18.9
1137
1.07
21
1182
1.22
22
848
0.20
7.7
874
0.24
8.2
894
0.29
8.6
916
0.34
9.2
941
0.40
10.3
968
0.47
11.9
998
0.55
13.4
1031
0.64
14.7
1067
0.74
16.4
1104
0.86
18.0
1144
0.99
19.7
1185
1.13
21
1228
1.29
23
1064
0.22
8.4
1097
0.26
8.7
1137
0.31
9.3
1178
0.37
10.1
1223
0.44
11.1
1270
0.52
12.2
1316
0.60
13.5
1361
0.69
14.7
1405
0.79
16.1
1449
0.90
17.6
1493
1.02
18.9
1170
0.29
9.7
1204
0.35
10.2
1243
0.41
10.5
1284
0.48
11.6
1329
0.56
12.8
1375
0.65
14.0
1422
0.74
15.4
1467
0.85
16.4
1511
0.96
17.8
1555
1.09
19.4
1338
0.42
11.9
1364
0.48
12.5
1401
0.56
13.2
1441
0.64
13.9
1483
0.74
15.0
1527
0.84
16.5
1573
0.96
17.4
1619
1.08
19.0
1.25"
RPM
BHP Sone
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
1650
0.81
17.6
1682
0.92
18.0
1719
1.03
18.8
1779
1.01
19.7
1.25"
RPM
BHP Sone
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
1323
0.73
16.7
1356
0.84
17.6
1380
0.94
18.4
1400
1.05
18.6
1420
1.17
19.5
1442
1.31
21
1466
1.45
22
1491
1.61
24
1446
0.94
19.6
1478
1.07
21
1505
1.20
21
1526
1.33
22
1545
1.47
23
1566
1.62
23
1561
1.18
22
1593
1.33
23
1621
1.48
24
1643
1.64
24
1493
0.56
14.9
1512
0.63
15.2
1546
0.72
15.8
1585
0.83
16.7
1626
0.94
17.4
1667
1.06
18.5
090 DBS
CFM
OV
600
622
725
752
850
882
975
1011
1100
1141
1225
1271
1350
1400
1475
1530
1600
1660
1725
1789
1850
1919
1975
2049
2100
2178
2225
2308
2350
2438
2475
2567
0.125"
RPM
BHP Sone
445
0.03
2.3
468
0.05
3.0
496
0.07
4.0
530
0.09
5.1
568
0.12
6.2
610
0.16
7.3
654
0.20
8.5
699
0.26
9.6
745
0.32
10.7
792
0.39
12.0
839
0.47
13.3
887
0.57
14.3
936
0.68
15.8
984
0.79
16.9
1033
0.93
18.3
1083
1.08
19.5
926
0.23
8.8
951
0.28
9.3
977
0.34
9.7
997
0.39
10.3
1018
0.46
10.9
1042
0.53
12.0
1068
0.61
13.5
1097
0.71
15.0
1128
0.81
16.5
1162
0.93
18.1
1197
1.06
20
1235
1.20
22
1275
1.36
23
1017
0.32
10.3
1047
0.38
11.0
1071
0.45
11.5
1091
0.51
12.2
1112
0.59
12.4
1136
0.68
13.7
1161
0.77
15.6
1189
0.88
17.3
1220
1.00
19.0
1252
1.13
20
1287
1.28
22
1323
1.44
24
1191
0.54
13.7
1222
0.63
14.4
1244
0.72
15.2
1263
0.81
15.8
1285
0.91
16.3
1308
1.02
17.7
1333
1.15
19.5
1360
1.29
21
1389
1.44
23
1421
1.61
25
NOTES:
1.Performance certified is for Installation Type B: Free inlet, ducted outlet.
2.Power rating (BHP) does not include transmission losses.
3.Performance ratings do not include the effects of appurtenances (accessories).
5
Twin City Bulletin 4220
Performance Data - DBS (Single)
100 DBS
CFM
OV
800
669
960
803
1120
937
1280
1071
1440
1205
1600
1339
1760
1473
1920
1607
2080
1741
2240
1874
2400
2008
2560
2142
2720
2276
2880
2410
3040
2544
3200
2678
0.125"
RPM
BHP Sone
409
0.05
2.6
432
0.07
3.6
461
0.10
4.8
495
0.13
5.8
533
0.17
7.0
573
0.23
8.2
615
0.29
9.6
658
0.37
10.8
702
0.45
12.1
746
0.56
13.4
791
0.68
14.5
836
0.81
16.0
881
0.96
17.1
927
1.13
18.4
974
1.32
20
1020
1.53
21
0.25"
RPM
BHP Sone
531
0.08
4.1
557
0.11
4.5
576
0.14
5.0
599
0.17
6.0
625
0.22
7.2
655
0.27
8.4
688
0.34
9.8
725
0.42
11.1
764
0.51
12.4
805
0.62
13.8
846
0.74
15.5
889
0.88
17.1
932
1.04
18.3
975
1.21
20
1019
1.40
21
1064
1.62
23
0.375"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
0.50"
0.625"
0.75"
1.00"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
648
0.14
5.8
675
0.18
6.3
695
0.22
6.8
715
0.27
7.4
738
0.33
8.7
765
0.40
10.0
795
0.48
11.3
827
0.58
12.7
862
0.69
14.2
899
0.81
15.7
939
0.96
17.5
979
1.11
19.2
1021
1.30
21
1063
1.49
22
750
0.22
7.5
778
0.27
8.0
798
0.33
8.5
817
0.39
9.0
839
0.46
10.3
864
0.55
11.6
892
0.65
12.9
922
0.76
14.8
955
0.89
16.0
989
1.03
17.8
1026
1.19
19.5
1065
1.38
21
1105
1.58
23
0.25"
RPM
BHP Sone
0.375"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
0.50"
0.75"
1.00"
1.25"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
412
0.09
4.0
416
0.12
4.3
426
0.15
4.8
440
0.19
5.4
458
0.23
6.1
480
0.29
6.9
505
0.36
7.6
532
0.44
8.4
558
0.52
9.7
585
0.63
10.6
611
0.74
11.9
637
0.87
13.2
664
1.01
14.6
691
1.16
15.6
719
1.34
17.3
504
0.17
5.8
507
0.20
6.1
514
0.24
6.5
526
0.29
6.8
541
0.35
7.5
558
0.42
8.4
579
0.50
9.1
604
0.59
9.9
630
0.70
11.0
656
0.82
12.3
683
0.96
13.5
709
1.11
14.7
735
1.27
16.0
761
1.45
17.7
582
0.25
7.2
584
0.30
7.7
591
0.35
8.0
601
0.41
8.3
615
0.48
8.8
630
0.57
9.7
649
0.66
10.7
670
0.77
11.9
695
0.90
12.6
720
1.04
13.9
747
1.20
14.9
774
1.38
16.5
800
1.56
17.7
843
0.32
9.3
871
0.38
9.8
891
0.45
10.1
910
0.53
10.6
932
0.62
11.8
955
0.72
13.5
982
0.84
15.0
1011
0.97
16.5
1042
1.12
18.4
1075
1.28
19.7
1110
1.46
22
930
0.43
10.9
957
0.52
11.3
977
0.60
12.0
996
0.69
12.6
1017
0.80
13.8
1041
0.92
15.3
1066
1.05
17.1
1094
1.20
18.6
1125
1.37
20
1157
1.56
23
1063
0.63
13.8
1092
0.73
14.3
1115
0.85
14.9
1133
0.96
15.8
1153
1.09
16.3
1175
1.23
17.5
1198
1.39
19.2
1222
1.56
21
1.25"
RPM
BHP Sone
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
1184
0.85
16.4
1212
0.98
17.3
1238
1.12
18.1
1257
1.26
18.5
1276
1.41
19.4
1296
1.58
20
1296
1.12
19.4
1324
1.27
20
1351
1.44
21
1371
1.60
22
1401
1.41
22
1428
1.59
23
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
2.00"
RPM
BHP Sone
1089
1.59
18.7
1089
1.73
19.0
1091
1.88
19.7
1096
2.05
19.9
1164
1.95
21
1164
2.11
21
120 DBS
CFM
OV
1000
537
1220
655
1440
773
1660
891
1880
1009
2100
1127
2320
1245
2540
1363
2760
1481
2980
1600
3200
1718
3420
1836
3640
1954
3860
2072
4080
2190
4300
2308
0.125"
RPM
BHP Sone
294
0.04
2.0
304
0.06
2.3
320
0.08
3.0
342
0.11
3.6
367
0.14
4.4
394
0.18
5.3
420
0.24
6.3
446
0.30
7.3
473
0.37
8.5
501
0.45
9.6
529
0.54
10.7
559
0.65
11.6
588
0.77
12.5
618
0.91
13.7
649
1.07
14.6
679
1.23
15.6
714
0.43
9.6
713
0.49
10.1
716
0.56
10.3
722
0.63
10.7
732
0.72
11.3
744
0.82
11.6
759
0.94
12.7
775
1.07
13.8
794
1.21
15.0
815
1.37
16.0
838
1.55
17.4
864
1.76
18.9
823
0.71
12.3
824
0.79
12.8
828
0.89
13.4
836
1.00
13.7
846
1.12
14.2
858
1.25
14.4
872
1.40
15.4
888
1.57
16.8
906
1.75
17.9
926
1.96
19.6
920
0.97
12.8
921
1.07
13.4
924
1.19
13.7
930
1.31
14.2
938
1.45
14.4
949
1.61
15.4
962
1.78
16.8
976
1.97
17.9
992
2.18
19.6
1008
1.26
16.7
1008
1.38
16.7
1011
1.52
17.7
1016
1.66
17.8
1023
1.82
18.8
1033
2.00
18.8
1044
2.19
19.5
NOTES:
1.Performance certified is for Installation Type B: Free inlet, ducted outlet.
2.Power rating (BHP) does not include transmission losses.
3.Performance ratings do not include the effects of appurtenances (accessories).
6
Twin City Bulletin 4220
Performance Data - DBS (Single)
140 DBS
CFM
OV
1800
773
2100
902
2400
1031
2700
1160
3000
1289
3300
1418
3600
1546
3900
1675
4200
1804
4500
1933
4800
2062
5100
2191
5400
2320
5700
2448
6000
2577
6300
2706
0.25"
RPM
BHP Sone
385
0.15
5.4
397
0.19
6.0
414
0.25
6.8
434
0.32
7.4
455
0.40
8.4
479
0.50
9.8
504
0.62
10.9
529
0.75
12.4
557
0.90
13.7
586
1.08
15.2
616
1.29
16.3
646
1.51
17.9
678
1.78
19.1
709
2.06
20
741
2.38
21
774
2.74
23
0.50"
RPM
BHP Sone
0.75"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
1.00"
1.25"
1.50"
1.75"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
2.00"
RPM
BHP Sone
2.25"
RPM
BHP Sone
2.75"
RPM
BHP Sone
537
0.32
8.9
541
0.38
9.4
550
0.46
9.8
563
0.55
10.5
580
0.66
11.3
599
0.79
12.4
619
0.93
13.3
641
1.10
14.6
664
1.30
16.1
688
1.51
17.3
713
1.74
19.0
739
2.01
21
765
2.29
22
793
2.62
24
822
2.97
25
658
0.54
11.9
659
0.63
12.3
664
0.72
12.8
673
0.84
13.6
686
0.98
14.1
702
1.13
15.2
720
1.31
16.3
739
1.50
17.2
760
1.73
18.3
781
1.98
19.8
804
2.26
21
828
2.57
23
853
2.91
25
878
3.27
26
760
0.81
14.5
760
0.92
15.4
763
1.04
15.9
770
1.18
16.3
781
1.35
17.0
794
1.53
18.0
810
1.74
19.0
828
1.97
20
847
2.23
21
867
2.52
23
889
2.84
24
911
3.20
26
934
3.58
27
1074
2.36
25
1074
2.56
26
1077
2.80
27
1082
3.06
27
1090
3.35
28
1100
3.68
28
1112
4.03
30
1127
4.42
30
1143
4.83
32
1139
2.86
28
1139
3.09
28
1142
3.36
29
1148
3.66
30
1156
3.99
30
1166
4.35
31
1178
4.75
32
1192
5.17
32
1260
3.73
28
1259
4.01
29
1261
4.32
30
1264
4.65
30
1270
5.02
31
1279
5.44
32
0.75"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
1.00"
1.25"
1.50"
1.75"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
2.00"
RPM
BHP Sone
2.25"
RPM
BHP Sone
2.75"
RPM
BHP Sone
954
3.09
955
3.39
958
3.71
965
4.09
973
4.49
984
4.95
997
5.46
1012
3.46
28
1011
3.75
29
1013
4.09
30
1017
4.47
30
1024
4.90
32
1032
5.36
32
1118
4.90
34
1119
5.30
34
850
1.13
17.9
849
1.26
18.3
852
1.41
19.0
858
1.57
19.4
867
1.77
20
879
1.99
21
894
2.23
22
910
2.49
23
928
2.79
24
947
3.11
25
967
3.47
26
988
3.87
28
931
1.49
20
930
1.64
21
932
1.82
21
938
2.02
22
947
2.25
23
958
2.50
23
971
2.77
24
986
3.07
25
1004
3.41
27
1022
3.77
28
1041
4.17
29
1005
1.90
22
1005
2.08
24
1007
2.28
24
1012
2.51
25
1020
2.77
25
1031
3.06
26
1044
3.38
27
1058
3.71
28
1075
4.09
29
1093
4.50
30
160 DBS
CFM
OV
2700
931
3100
1069
3500
1206
3900
1344
4300
1482
4700
1620
5100
1758
5500
1896
5900
2034
6300
2172
6700
2310
7100
2447
7500
2585
7900
2723
8300
2861
8700
2999
0.25"
RPM
BHP Sone
354
0.25
6.2
370
0.32
7.0
389
0.42
7.9
410
0.54
9.1
432
0.67
10.8
455
0.83
12.4
480
1.02
13.9
506
1.24
15.3
534
1.50
16.6
562
1.79
18.2
591
2.12
19.4
621
2.49
21
651
2.91
23
681
3.36
24
711
3.86
25
742
4.43
27
0.50"
RPM
BHP Sone
477
0.41
9.5
481
0.50
10.1
491
0.61
10.5
504
0.73
11.3
520
0.88
12.4
538
1.06
13.4
558
1.27
14.6
578
1.50
15.9
601
1.78
17.5
624
2.08
18.9
647
2.41
21
672
2.79
23
697
3.19
24
724
3.66
26
752
4.18
28
780
4.74
29
584
0.70
12.5
586
0.82
13.3
592
0.96
13.8
601
1.12
14.4
614
1.30
15.5
630
1.52
16.1
647
1.77
17.2
666
2.05
18.6
686
2.38
19.9
706
2.73
22
728
3.12
23
751
3.56
25
775
4.05
25
798
4.55
29
823
5.12
30
674
1.05
15.5
675
1.20
16.2
680
1.37
16.9
687
1.57
17.4
698
1.80
18.2
712
2.06
19.0
728
2.35
20
745
2.68
22
764
3.05
23
783
3.46
24
803
3.91
26
825
4.42
28
847
4.96
29
754
1.47
18.5
755
1.65
18.6
758
1.85
19.7
765
2.09
20
775
2.37
21
787
2.67
22
802
3.01
23
818
3.39
24
836
3.81
25
854
4.27
27
873
4.78
29
894
5.36
31
826
1.95
826
2.16
830
2.41
836
2.68
845
3.00
857
3.36
871
3.75
886
4.17
903
4.65
921
5.17
21
22
22
23
24
25
26
27
29
892
2.49
893
2.74
896
3.02
903
3.35
911
3.71
922
4.11
935
4.55
950
5.04
24
25
25
26
27
28
29
30
27
27
28
29
30
30
32
30
NOTES:
1.Performance certified is for Installation Type B: Free inlet, ducted outlet.
2.Power rating (BHP) does not include transmission losses.
3.Performance ratings do not include the effects of appurtenances (accessories).
7
Twin City Bulletin 4220
Performance Data - DBS (Single)
180 DBS
CFM
OV
3000
825
3500
963
4000
1100
4500
1238
5000
1376
5500
1513
6000
1651
6500
1788
7000
1926
7500
2063
8000
2201
8500
2338
9000
2476
9500
2613
10000
2751
10500
2889
0.25"
RPM
BHP Sone
299
0.24
4.4
309
0.30
4.9
323
0.39
5.8
339
0.50
6.9
356
0.63
7.9
375
0.79
9.2
394
0.97
10.5
414
1.17
11.9
436
1.41
13.3
457
1.67
14.9
480
1.99
16.3
502
2.32
18.1
525
2.71
19.4
549
3.15
21
572
3.62
23
596
4.15
24
0.50"
RPM
BHP Sone
412
0.42
7.1
414
0.51
7.5
419
0.61
8.0
428
0.73
8.4
439
0.88
8.9
452
1.05
10.0
468
1.26
11.2
484
1.49
12.3
501
1.75
13.7
519
2.05
15.2
538
2.38
16.5
558
2.75
18.3
578
3.16
19.7
599
3.60
22
620
4.09
23
642
4.63
25
0.75"
RPM
BHP Sone
0.50"
RPM
BHP Sone
379
0.77
8.0
391
1.01
8.9
408
1.31
10.1
428
1.68
12.0
451
2.15
14.2
475
2.70
16.2
500
3.33
18.5
527
4.07
21
555
4.92
23
584
5.90
26
613
6.99
29
643
8.25
31
673
9.64
34
704
11.23
38
735
12.98
41
766
14.89
43
0.75"
RPM
BHP Sone
456
1.08
10.6
462
1.34
11.3
472
1.66
12.1
487
2.07
12.9
505
2.56
14.6
526
3.14
16.7
549
3.84
18.7
572
4.61
21
597
5.52
23
623
6.54
26
651
7.71
29
678
8.96
32
707
10.40
35
736
11.98
39
766
13.77
41
796
15.72
44
505
0.74
9.5
506
0.86
10.1
509
0.99
10.3
515
1.15
10.9
523
1.34
11.5
534
1.56
12.1
547
1.81
12.9
562
2.10
13.9
578
2.42
15.5
594
2.77
17.1
611
3.16
18.5
629
3.59
19.8
648
4.08
22
667
4.59
23
687
5.16
26
STATIC PRESSURE (INCHES W.G.)
1.00"
1.25"
1.50"
1.75"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
583
1.13
11.7
584
1.29
12.2
586
1.45
12.9
591
1.65
13.3
598
1.88
13.9
607
2.14
14.5
618
2.44
14.8
631
2.77
15.8
646
3.15
17.5
662
3.58
18.7
678
4.03
21
695
4.53
22
712
5.06
23
656
1.42
13.6
652
1.59
14.0
652
1.78
14.6
655
2.00
14.9
659
2.23
15.6
666
2.51
16.1
674
2.82
16.7
684
3.17
17.4
696
3.56
17.7
709
3.98
19.4
724
4.47
21
740
4.99
22
717
1.91
15.5
714
2.12
16.3
715
2.35
16.5
717
2.61
17.3
722
2.90
17.6
728
3.22
18.5
735
3.57
18.7
745
3.98
19.8
756
4.42
19.9
768
4.90
21
782
5.44
23
773
2.47
17.6
771
2.72
18.4
772
2.99
18.7
775
3.30
19.5
779
3.63
19.9
785
4.00
21
792
4.41
21
802
4.88
22
812
5.37
22
2.00"
RPM
BHP Sone
2.25"
RPM
BHP Sone
2.75"
RPM
BHP Sone
831
2.85
19.3
825
3.10
19.7
824
3.39
20
826
3.72
21
829
4.07
22
833
4.45
22
839
4.88
23
846
5.34
23
879
3.51
874
3.80
875
4.15
876
4.51
880
4.93
884
5.35
2.50"
RPM
BHP Sone
3.00"
RPM
BHP Sone
3.50"
RPM
BHP Sone
830
5.41
831
6.11
834
6.88
840
7.75
848
8.72
859
9.84
872
11.08
887
12.46
905
14.04
925
15.80
915
6.55
909
7.26
910
8.10
913
9.02
919
10.06
927
11.21
937
12.50
950
13.97
964
15.55
986
8.50
31
982
9.37
32
984
10.39
33
987
11.47
34
993
12.69
35
1000
13.99
36
1010
15.48
37
21
22
22
23
972
4.67
25
967
5.03
25
967
5.45
26
24
24
200 DBS
CFM
OV
5000
1099
5900
1297
6800
1495
7700
1693
8600
1891
9500
2089
10400
2287
11300
2485
12200
2682
13100
2880
14000
3078
14900
3276
15800
3474
16700
3672
17600
3870
18500
4068
0.25"
RPM
BHP Sone
293
0.50
6.0
314
0.71
7.6
338
0.98
9.3
364
1.32
11.3
392
1.73
13.6
420
2.21
15.9
450
2.81
18.3
480
3.51
20
511
4.34
23
543
5.31
25
574
6.37
27
606
7.60
29
638
8.98
32
671
10.56
35
703
12.25
38
736
14.17
41
STATIC PRESSURE (INCHES W.G.)
1.00"
1.25"
1.50"
2.00"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
525
590
1.41
12.3
1.77
14.0
527
587
644
1.70
13.1
2.09
14.8
2.50
16.5
533
590
644
743
2.05
13.9
2.47
15.6
2.91
17.5
3.83
21
543
597
648
743
2.48
14.6
2.92
16.5
3.39
18.0
4.38
21
557
607
655
746
3.00
15.5
3.46
17.5
3.94
19.0
4.99
22
574
620
666
753
3.61
16.9
4.09
18.1
4.61
20
5.71
23
594
637
680
762
4.33
19.5
4.84
19.9
5.39
21
6.52
24
616
657
696
773
5.17
21
5.72
22
6.26
22
7.44
25
639
678
716
788
6.12
24
6.70
25
7.31
25
8.52
26
662
700
736
805
7.17
26
7.81
26
8.43
27
9.73
28
687
723
758
824
8.38
29
9.05
29
9.72
29
11.08
30
713
747
781
845
9.72
32
10.43
32
11.16
32
12.60
33
740
773
805
867
11.20
35
12.00
35
12.76
35
14.28
35
768
799
829
889
12.85
38
13.69
38
14.47
38
16.09
39
796
825
855
14.63
42
15.50
42
16.41
42
24
25
26
27
28
29
30
31
34
27
28
29
30
31
32
33
34
35
37
NOTES:
1.Performance certified is for Installation Type B: Free inlet, ducted outlet.
2.Power rating (BHP) does not include transmission losses.
3.Performance ratings do not include the effects of appurtenances (accessories).
8
Twin City Bulletin 4220
Performance Data - DBT (Twin)
080 DBT
CFM
OV
800
519
1000
649
1200
779
1400
909
1600
1039
1800
1169
2000
1299
2200
1429
2400
1558
2600
1688
2800
1818
3000
1948
3200
2078
3400
2208
3600
2338
3800
2468
0.125"
RPM
BHP Sone
483
0.04
2.2
523
0.06
2.7
569
0.09
3.8
616
0.12
4.8
662
0.17
5.9
710
0.22
6.8
761
0.29
8
813
0.37
9.2
867
0.46
10.4
923
0.57
11.7
979
0.69
13.1
1036
0.84
14.3
1094
1.00
15.8
1152
1.18
17.4
1211
1.39
18.7
1271
1.62
20
0.25"
RPM
BHP Sone
0.375"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
0.50"
0.625"
0.75"
1.00"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
695
0.13
4.8
736
0.17
5.3
781
0.22
6.2
830
0.29
7.3
876
0.36
8.5
922
0.45
9.7
968
0.54
10.9
1018
0.66
12.5
1069
0.79
13.9
1121
0.94
15.4
1174
1.11
17
1228
1.30
18.6
1283
1.52
20
1339
1.75
22
840
0.21
6.6
878
0.27
7.1
920
0.34
7.8
967
0.43
8.9
1015
0.52
10.1
1062
0.63
11.4
1107
0.75
13
1153
0.89
14.3
1201
1.05
15.7
1250
1.22
17.4
1301
1.42
19
1353
1.64
21
1406
1.89
22
967
0.32
8.3
1004
0.40
8.8
1045
0.49
9.4
1090
0.59
10.7
1138
0.71
12
1186
0.85
13.1
1233
1.00
14.8
1278
1.16
16.3
1324
1.34
18
1371
1.54
19.4
1420
1.77
21
1470
2.02
23
0.25"
RPM
BHP Sone
0.375"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
0.50"
0.625"
0.75"
1.00"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
606
0.15
5.1
626
0.19
5.5
645
0.24
6.1
666
0.29
7
692
0.36
8.2
720
0.44
9.4
752
0.53
11
786
0.64
12.3
822
0.76
13.8
860
0.90
15.2
899
1.06
16.6
939
1.24
18.2
980
1.44
19.4
1021
1.66
21
1063
1.90
23
729
0.25
7.1
755
0.31
7.6
773
0.38
8
792
0.45
8.8
814
0.53
9.9
838
0.63
11.3
866
0.74
12.5
896
0.87
14
928
1.01
15.6
962
1.17
16.9
998
1.35
18.7
1036
1.56
20
1075
1.79
22
1114
2.03
24
838
0.38
9
866
0.46
9.5
884
0.54
10
903
0.63
10.6
923
0.73
11.6
946
0.85
13
970
0.98
14.3
998
1.13
16.1
1028
1.30
17.5
1059
1.48
19.2
1093
1.69
21
1128
1.92
23
1165
2.17
24
1083
0.45
10
1120
0.55
10.6
1161
0.66
11.2
1205
0.78
12.4
1252
0.93
13.7
1301
1.09
15
1348
1.27
16.7
1394
1.46
18.3
1439
1.67
20
1485
1.90
21
1533
2.16
23
1191
0.61
11.7
1228
0.72
12.4
1270
0.86
13.1
1313
1.01
14.2
1360
1.18
15.6
1408
1.36
17.2
1456
1.57
18.8
1503
1.79
21
1549
2.04
22
1359
0.86
14
1391
1.00
15.4
1431
1.17
16.1
1472
1.35
17.1
1516
1.55
18.6
1563
1.77
19.9
1611
2.02
22
1.25"
RPM
BHP Sone
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
1513
1.16
17.9
1540
1.32
18.9
1577
1.52
19.1
1619
1.74
20
1661
1.97
21
1656
1.51
21
1679
1.69
21
1715
1.91
22
1755
2.16
22
1788
1.89
23
1810
2.10
23
1.25"
RPM
BHP Sone
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
090 DBT
CFM
OV
1200
622
1425
739
1650
856
1875
973
2100
1089
2325
1206
2550
1323
2775
1439
3000
1556
3225
1673
3450
1789
3675
1906
3900
2023
4125
2140
4350
2256
4575
2373
0.125"
RPM
BHP Sone
445
0.07
3
465
0.10
3.6
490
0.13
4.8
519
0.17
5.8
552
0.22
7
589
0.28
8.2
627
0.36
9.3
667
0.44
10.7
708
0.55
12.1
750
0.67
13.4
792
0.80
14.4
835
0.95
15.6
878
1.13
17.1
921
1.32
18.1
965
1.53
19.9
1009
1.76
21
938
0.53
10.9
966
0.63
11.6
985
0.73
12
1003
0.84
12.6
1023
0.96
13.3
1044
1.10
14.9
1067
1.25
16.3
1093
1.42
18.1
1122
1.62
19.6
1151
1.82
21
1183
2.06
23
1030
0.71
12.7
1058
0.83
13.5
1077
0.95
14
1095
1.08
14.7
1115
1.23
15.1
1136
1.39
16.5
1158
1.56
18.3
1183
1.75
20
1210
1.97
22
1175
1.01
16.2
1201
1.16
16.7
1227
1.32
17.4
1246
1.49
18.3
1263
1.65
18.9
1282
1.84
19.5
1304
2.05
21
1310
1.37
19.4
1330
1.54
20
1359
1.74
21
1380
1.94
22
1398
2.14
22
1449
1.96
23
1478
2.19
24
NOTES:
1.Performance certified is for Installation Type B: Free inlet, ducted outlet.
2.Power rating (BHP) does not include transmission losses.
3.Performance ratings do not include the effects of appurtenances (accessories).
9
Twin City Bulletin 4220
Performance Data - DBT (Twin)
100 DBT
CFM
OV
1600
669
1920
803
2240
937
2560
1071
2880
1205
3200
1339
3520
1473
3840
1607
4160
1741
4480
1874
4800
2008
5120
2142
5440
2276
5760
2410
6080
2544
6400
2678
0.125"
RPM
BHP Sone
409
0.10
3.3
432
0.14
4.5
461
0.19
5.8
495
0.27
7.1
533
0.35
8.4
573
0.46
9.9
615
0.59
11.5
658
0.75
13
702
0.93
14.5
746
1.14
16.1
791
1.38
17.5
836
1.66
19.2
881
1.96
21
927
2.31
22
973
2.69
24
1020
3.13
26
0.25"
RPM
BHP Sone
531
0.16
5.1
557
0.22
5.5
576
0.28
6.1
599
0.36
7.2
625
0.45
8.7
655
0.56
10.1
689
0.70
11.8
725
0.86
13.4
764
1.05
14.9
805
1.28
16.7
846
1.52
18.6
889
1.81
20
932
2.13
22
975
2.48
24
1019
2.88
26
1064
3.32
28
0.375"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
0.50"
0.625"
0.75"
1.00"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
648
0.29
7
676
0.37
7.6
695
0.46
8.1
715
0.56
8.9
738
0.68
10.4
765
0.82
12.1
795
0.99
13.7
827
1.19
15.7
862
1.41
17.1
900
1.67
18.8
939
1.96
21
979
2.29
23
1021
2.66
25
1063
3.06
27
750
0.45
9.1
778
0.56
9.7
798
0.67
10.2
817
0.80
10.9
839
0.95
12.4
864
1.13
14
892
1.33
15.5
922
1.56
17.8
955
1.82
19.2
989
2.12
21
1026
2.45
23
1065
2.82
26
1105
3.24
27
0.25"
RPM
BHP Sone
0.375"
RPM
BHP Sone
412
0.19
4.9
416
0.24
5.3
426
0.30
5.8
440
0.38
6.6
458
0.48
7.4
480
0.59
8.3
505
0.73
9.2
532
0.89
10.1
558
1.08
11.6
585
1.29
12.8
611
1.52
14.4
637
1.78
15.8
664
2.07
17.5
691
2.39
18.8
719
2.74
21
504
0.34
7.1
507
0.41
7.4
514
0.49
7.8
526
0.59
8.2
541
0.71
9.1
558
0.85
10.1
579
1.02
10.9
604
1.22
12
630
1.44
13.3
656
1.69
14.8
683
1.97
16.1
709
2.27
17.8
735
2.61
19.3
761
2.98
21
1.25"
RPM
BHP Sone
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
1184
1.75
19.7
1213
2.02
21
1238
2.30
22
1258
2.60
22
1276
2.90
23
1296
3.24
24
1296
2.29
23
1324
2.61
24
1351
2.95
25
1371
3.29
26
1401
2.90
27
1428
3.26
28
STATIC PRESSURE (INCHES W.G.)
0.50"
0.75"
1.00"
1.25"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
2.00"
RPM
BHP Sone
582
0.52
8.7
584
0.61
9.2
591
0.72
9.6
601
0.84
9.9
614
0.99
10.5
630
1.16
11.7
649
1.36
13
670
1.58
14.4
695
1.85
15.3
720
2.13
16.7
747
2.46
18
774
2.82
19.9
800
3.20
21
1008
2.58
20
1008
2.83
20
1011
3.11
21
1016
3.41
21
1023
3.74
22
1033
4.10
23
1044
4.49
23
1058
4.94
24
1089
3.25
22
1089
3.54
23
1091
3.86
23
1096
4.21
24
1103
4.59
25
1111
4.99
25
1122
5.43
25
843
0.65
11.2
871
0.79
11.8
891
0.93
12.2
910
1.09
12.8
932
1.27
14.2
955
1.48
16.2
981
1.72
18.1
1011
1.99
19.8
1042
2.29
22
1075
2.63
24
1110
3.00
26
930
0.89
13.2
958
1.06
13.7
977
1.23
14.5
996
1.42
15.1
1017
1.64
16.7
1040
1.88
18.4
1066
2.16
20
1094
2.47
22
1125
2.81
24
1157
3.20
27
1063
1.29
16.7
1093
1.51
17.2
1115
1.73
17.9
1134
1.97
18.9
1153
2.23
19.6
1175
2.52
21
1197
2.84
23
1222
3.20
25
120 DBT
CFM
OV
2000
537
2440
655
2880
773
3320
891
3760
1009
4200
1127
4640
1245
5080
1363
5520
1481
5960
1600
6400
1718
6840
1836
7280
1954
7720
2072
8160
2190
8600
2308
0.125"
RPM
BHP Sone
294
0.08
2.6
304
0.12
3
320
0.16
3.7
342
0.22
4.5
367
0.29
5.5
394
0.38
6.5
420
0.48
7.6
446
0.61
8.8
473
0.75
10.2
501
0.92
11.6
529
1.11
13
559
1.34
14
588
1.58
15
618
1.86
16.5
649
2.18
17.5
679
2.53
18.9
714
0.88
11.6
713
1.00
12.2
716
1.14
12.5
722
1.29
13
732
1.48
13.6
744
1.68
14.1
759
1.92
15.2
775
2.18
16.6
794
2.48
18.1
815
2.82
19.4
838
3.18
21
864
3.61
23
823
1.45
14.8
824
1.63
15.5
828
1.82
16
836
2.05
16.4
846
2.29
17.1
858
2.56
17.3
872
2.87
18.6
888
3.21
20
906
3.60
21
926
4.02
24
920
1.98
17.2
921
2.20
17.9
924
2.43
18.4
930
2.69
19
938
2.97
19.5
949
3.29
20
961
3.64
21
976
4.03
22
992
4.46
24
1164
3.99
25
1164
4.33
25
1166
4.69
26
1170
5.08
26
NOTES:
1.Performance certified is for Installation Type B: Free inlet, ducted outlet.
2.Power rating (BHP) does not include transmission losses.
3.Performance ratings do not include the effects of appurtenances (accessories).
10
Twin City Bulletin 4220
Performance Data - DBT (Twin)
140 DBT
CFM
OV
3600
773
4175
897
4750
1020
5325
1144
5900
1267
6475
1391
7050
1514
7625
1638
8200
1761
8775
1885
9350
2008
9925
2132
10500
2255
11075
2379
11650
2502
12225
2626
0.125"
RPM
BHP Sone
299
0.20
4.6
319
0.28
5.6
342
0.38
6.7
366
0.50
8.1
392
0.64
9.3
420
0.82
11.0
449
1.03
12.5
478
1.28
13.9
509
1.57
15.1
540
1.90
16.4
571
2.27
17.3
603
2.70
19.1
634
3.17
20
666
3.70
22
698
4.28
24
730
4.92
25
0.25"
RPM
BHP Sone
385
0.30
6.6
397
0.39
7.2
413
0.50
8.0
431
0.63
9.0
452
0.79
10.2
474
0.98
11.8
497
1.19
13.1
522
1.45
14.5
547
1.73
16.1
575
2.07
17.3
603
2.45
19.0
632
2.88
20
662
3.36
22
692
3.90
24
723
4.50
25
753
5.13
27
0.375"
RPM
BHP Sone
465
0.42
8.8
469
0.51
9.1
478
0.63
9.7
491
0.77
10.5
508
0.94
11.4
526
1.13
12.4
547
1.37
13.5
568
1.63
14.9
591
1.94
16.6
615
2.28
18.3
639
2.66
19.8
665
3.10
22
692
3.58
23
720
4.12
25
748
4.71
27
778
5.38
28
0.50"
RPM
BHP Sone
477
0.85
11.5
482
1.03
12.3
492
1.27
12.9
507
1.56
13.9
524
1.89
15.2
544
2.30
16.6
565
2.77
17.9
588
3.32
19.9
612
3.94
22
637
4.64
24
662
5.40
26
689
6.27
28
717
7.25
30
746
8.34
32
776
9.55
35
807
10.91
38
0.75"
RPM
BHP Sone
STATIC PRESSURE (INCHES W.G.)
0.50"
0.75"
1.00"
1.25"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
537
0.65
10.8
540
0.77
11.3
549
0.92
11.8
561
1.10
12.6
576
1.30
13.7
594
1.54
14.8
613
1.82
16.0
633
2.14
17.0
655
2.50
18.5
678
2.90
20
702
3.35
22
726
3.84
24
751
4.38
25
777
4.98
27
658
1.10
14.5
658
1.26
14.9
663
1.45
15.7
671
1.67
16.3
683
1.93
17.0
697
2.22
17.7
714
2.56
18.9
732
2.93
20
751
3.35
22
771
3.82
23
793
4.36
25
815
4.93
26
760
1.64
17.4
759
1.84
18.5
762
2.07
18.6
768
2.34
19.7
778
2.66
20
790
3.01
21
804
3.40
22
821
3.84
24
838
4.31
25
857
4.86
26
877
5.46
28
849
2.52
851
2.80
856
3.12
864
3.49
874
3.89
887
4.35
902
4.85
919
5.41
1.50"
RPM
BHP Sone
1.75"
RPM
BHP Sone
930
3.29
931
3.61
936
3.99
943
4.42
953
4.90
964
5.41
1005
3.81
27
1004
4.15
28
1006
4.54
28
1010
4.97
29
1017
5.45
30
2.00"
RPM
BHP Sone
22
22
23
24
24
26
27
25
25
26
27
28
1074
4.71
30
1074
5.11
30
28
28
160 DBT
CFM
OV
5400
931
6250
1077
7100
1224
7950
1370
8800
1517
9650
1663
10500
1810
11350
1956
12200
2103
13050
2249
13900
2396
14750
2542
15600
2689
16450
2835
17300
2982
18150
3128
0.25"
RPM
BHP Sone
354
0.51
7.5
371
0.67
8.5
391
0.88
9.7
414
1.15
11.5
438
1.46
13.5
463
1.83
15.7
490
2.26
17.3
518
2.77
19.3
548
3.36
21
578
4.03
22
610
4.82
24
641
5.67
26
673
6.64
28
705
7.71
30
738
8.92
32
771
10.25
34
584
1.46
15.4
586
1.70
16.2
593
2.01
16.8
604
2.38
17.9
619
2.81
19.0
636
3.30
21
655
3.87
22
676
4.54
23
697
5.27
25
720
6.10
27
744
7.02
29
769
8.04
32
794
9.14
34
820
10.35
36
STATIC PRESSURE (INCHES W.G.)
1.00"
1.25"
1.50"
1.75"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
674
2.20
18.6
676
2.52
19.7
681
2.90
20
691
3.37
21
703
3.88
22
719
4.48
23
736
5.14
25
755
5.90
26
776
6.78
28
797
7.74
30
819
8.79
32
843
9.97
35
754
3.08
755
3.48
760
3.94
768
4.48
780
5.12
794
5.81
811
6.60
829
7.47
848
8.44
869
9.56
890
10.75
2.00"
RPM
BHP Sone
2.25"
RPM
BHP Sone
954
5.96
954
6.56
956
7.22
961
7.97
969
8.83
980
9.80
993
10.86
1012
7.32
34
1012
8.00
36
1015
8.77
36
1020
9.62
38
1029
10.62
39
2.75"
RPM
BHP Sone
22
23
23
25
25
27
29
30
32
34
826
4.10
827
4.58
832
5.14
840
5.78
851
6.51
864
7.31
880
8.22
898
9.23
916
10.31
25
26
28
28
29
31
33
34
892
5.25
894
5.83
899
6.48
907
7.24
917
8.06
930
8.99
946
10.04
29
30
31
32
33
34
36
31
32
34
34
36
36
1119
9.65
40
1118
10.44
41
38
35
36
NOTES:
1.Performance certified is for Installation Type B: Free inlet, ducted outlet.
2.Power rating (BHP) does not include transmission losses.
3.Performance ratings do not include the effects of appurtenances (accessories).
11
Twin City Bulletin 4220
Performance Data - DBT (Twin)
180 DBT
CFM
OV
6000
825
7000
963
8000
1100
9000
1238
10000
1376
11000
1513
12000
1651
13000
1788
14000
1926
15000
2063
16000
2201
17000
2338
18000
2476
19000
2613
20000
2751
21000
2889
0.25"
RPM
BHP Sone
299
0.48
5.4
309
0.62
5.9
323
0.81
7.0
339
1.03
8.2
356
1.30
9.5
375
1.62
11.0
394
1.99
12.7
414
2.40
14.4
436
2.90
16.0
457
3.43
18.0
480
4.08
19.6
502
4.76
22
525
5.55
23
549
6.46
25
572
7.42
27
596
8.50
29
0.50"
RPM
BHP Sone
412
0.87
8.5
414
1.04
9.0
419
1.25
9.6
428
1.51
10.1
439
1.81
10.7
452
2.16
12.1
468
2.59
13.5
484
3.06
14.9
501
3.59
16.5
519
4.20
18.3
538
4.88
19.9
558
5.64
22
578
6.47
23
599
7.39
26
620
8.37
27
642
9.48
30
0.75"
RPM
BHP Sone
505
1.52
11.5
506
1.76
12.1
509
2.04
12.5
515
2.36
13.1
523
2.74
13.9
534
3.19
14.6
547
3.70
15.6
562
4.30
16.8
578
4.96
18.7
594
5.67
20
611
6.47
22
629
7.36
24
648
8.35
26
667
9.41
28
687
10.59
30
STATIC PRESSURE (INCHES W.G.)
1.00"
1.25"
1.50"
1.75"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
583
2.31
14.1
584
2.64
14.8
586
2.98
15.6
591
3.39
16.0
598
3.86
16.7
607
4.39
17.5
618
5.00
17.9
631
5.68
19.1
646
6.47
21
662
7.33
22
678
8.26
25
695
9.28
26
712
10.38
27
656
2.91
16.3
652
3.25
16.8
652
3.64
17.6
655
4.09
17.9
659
4.58
18.8
666
5.15
19.4
674
5.78
20
684
6.49
21
696
7.29
21
709
8.16
23
724
9.15
25
740
10.24
26
717
3.91
18.7
714
4.34
19.6
715
4.83
19.9
717
5.34
21
722
5.95
21
728
6.60
22
735
7.32
22
745
8.16
24
756
9.07
24
768
10.05
25
773
5.06
771
5.57
772
6.14
775
6.77
779
7.45
785
8.21
792
9.03
802
10.00
21
22
22
23
24
25
25
26
2.00"
RPM
BHP Sone
2.25"
RPM
BHP Sone
831
5.83
825
6.35
824
6.95
826
7.63
829
8.35
833
9.13
839
10.00
846
10.94
879
7.19
874
7.78
875
8.51
876
9.25
880
10.10
884
10.98
2.75"
RPM
BHP Sone
23
23
24
25
26
26
27
25
26
27
972
9.57
30
967
10.31
30
28
28
29
28
200 DBT
CFM
OV
12000
1319
13300
1462
14600
1605
15900
1748
17200
1891
18500
2034
19800
2177
21100
2320
22400
2463
23700
2606
25000
2748
26300
2891
27600
3034
28900
3177
30200
3320
31500
3463
0.25"
0.50"
0.75"
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone
317
392
462
1.51
9.4
2.11
10.7
2.80
13.7
334
405
470
1.91
11.0
2.57
11.9
3.29
14.2
352
419
480
2.37
12.6
3.10
13.6
3.86
14.8
372
435
492
2.93
14.3
3.72
15.3
4.51
15.8
392
451
505
3.55
16.3
4.40
17.1
5.24
17.5
412
468
520
4.24
18.3
5.19
18.6
6.09
19.6
433
486
536
5.05
20
6.08
21
7.05
21
455
505
553
5.99
22
7.08
22
8.13
23
477
524
570
7.04
24
8.17
25
9.30
25
499
544
588
8.21
26
9.38
26
10.61
27
522
565
606
9.54
28
10.75
29
12.01
29
544
585
625
10.95
30
12.17
31
13.56
31
567
606
644
12.55
31
13.77
33
15.20
35
590
628
664
14.29
33
15.58
37
17.02
37
613
650
685
16.18
37
17.54
39
19.05
39
637
672
18.31
39
19.65
41
STATIC PRESSURE (INCHES W.G.)
1.00"
1.25"
1.50"
1.75"
RPM
RPM
RPM
RPM
BHP Sone BHP Sone BHP Sone BHP Sone
527
587
643
698
3.55
15.9
4.36
18.0
5.19
19.9
6.09
22
532
589
643
694
4.08
16.5
4.91
18.8
5.80
21
6.71
22
538
593
646
695
4.67
17.1
5.55
19.4
6.50
21
7.45
23
546
599
650
698
5.34
17.8
6.27
20
7.26
22
8.27
24
557
607
655
702
6.15
18.7
7.09
21
8.08
23
9.16
25
569
616
662
707
7.03
19.9
8.00
21
9.02
24
10.12
25
583
628
671
714
8.04
22
9.07
22
10.09
24
11.21
26
598
640
682
723
9.17
24
10.19
24
11.30
25
12.45
27
613
655
694
733
10.37
25
11.53
26
12.62
27
13.79
28
630
670
708
745
11.77
28
12.94
28
14.11
28
15.31
28
646
685
722
758
13.21
29
14.45
30
15.69
30
16.95
31
664
702
738
772
14.87
31
16.19
32
17.48
33
18.74
33
682
718
753
16.64
35
17.97
35
19.31
35
700
735
18.52
37
19.93
37
2.00"
RPM
BHP Sone
2.25"
RPM
BHP Sone
744
7.68
742
8.44
744
9.32
746
10.23
751
11.29
756
12.39
763
13.63
772
15.05
782
16.57
793
18.23
793
8.71
788
9.48
788
10.40
789
11.36
792
12.42
797
13.62
803
14.92
810
16.33
818
17.85
828
19.57
24
25
26
27
27
28
28
30
30
31
2.75"
RPM
BHP Sone
26
27
28
28
29
30
30
31
877
11.69
872
12.64
871
13.72
872
14.88
874
16.12
878
17.50
883
18.99
32
33
NOTES:
1.Performance certified is for Installation Type B: Free inlet, ducted outlet.
2.Power rating (BHP) does not include transmission losses.
3.Performance ratings do not include the effects of appurtenances (accessories).
12
Twin City Bulletin 4220
30
31
32
33
33
34
35
Dimensional Data
Model DBS (Single)
H
4X
2.00
G
E
D SQ.
MOUNTING BRACKETS MAY
BE MOUNTED ON TOP OR
BOTTOM OF FAN
0.53
1.50
A
F
K
J
B
C
MODEL
DBS
A
B
C
D
SQ.
E
F
G
H
J
K
MAX
FRAME
DAMPER
SIZE, SQ.
AVG. SHIP
WT. (LBS.)
080
090
100
120
140
160
180
200
16.13
18.00
19.69
25.25
27.50
30.75
34.88
38.63
18.38
20.63
22.25
28.75
32.38
36.25
41.00
45.38
23.31
24.31
28.31
33.81
34.09
38.09
43.09
47.59
10.50
11.75
13.06
16.38
18.31
20.44
22.88
25.63
15.38
17.63
19.25
25.75
28.38
32.25
37.00
41.38
13.13
15.00
16.69
21.25
23.50
26.75
30.88
34.63
20.38
22.63
24.25
30.75
34.38
38.25
43.00
47.38
20.13
21.13
24.88
30.38
30.00
34.00
39.00
43.38
1.31
1.31
1.31
1.31
1.63
1.63
1.63
1.63
1.00
1.00
1.00
1.00
1.50
1.50
1.50
2.00
145T
145T
184T
184T
184T
184T
215T
256T
10.50
11.75
13.13
16.38
18.25
20.44
22.88
25.63
57
65
77
129
151
180
226
261
Notes:
1. All figures are in inches unless noted otherwise.
2. Average ship weight is for fan and motor assembly.
3. Dimensions are not to be used for construction.
13
D-4220-1
Twin City Bulletin 4220
Dimensional Data
Model DBT (Twin)
2X E
4X 0.53
H
MOUNTING BRACKETS MAY
BE MOUNTED ON TOP OR
BOTTOM OF FAN
K
D SQ.
M
N
G
L
A
2X F
J
2.00
C
B
MODEL
DBT
A
B
C
D
SQ.
E
F
G
H
J
K
L
M
N
MAX
FRAME
DAMPER
SIZE, SQ.
AVG. SHIP
WT. (LBS.)
080
090
100
120
140
160
180
200
17.63
19.50
21.19
27.00
29.25
32.50
36.88
40.63
36.63
41.13
44.50
57.50
64.75
72.50
82.00
90.75
23.31
24.31
28.31
33.81
34.09
38.09
43.09
47.59
10.50
11.75
13.06
16.38
18.31
20.44
22.88
25.63
15.38
17.63
19.25
25.75
28.38
32.25
37.00
41.38
13.13
15.00
16.69
21.25
23.50
26.75
30.88
34.63
38.63
43.13
46.50
59.50
66.75
74.50
84.00
92.75
20.13
21.13
24.88
30.38
30.00
34.00
39.00
43.38
1.31
1.31
1.31
1.31
1.63
1.63
1.63
1.63
4.00
4.44
4.63
6.25
7.00
8.00
9.00
10.00
1.00
1.00
1.00
1.00
1.50
1.50
1.50
2.00
7.75
8.75
9.13
12.38
14.00
15.75
18.13
19.75
0.75
0.75
0.75
0.63
0.63
0.63
0.50
0.50
145T
145T
184T
184T
184T
215T
215T
286T
10.50
11.75
13.13
16.38
18.25
20.44
22.88
25.63
97
115
143
242
270
322
413
523
Notes:
1. All figures are in inches unless noted otherwise.
2. Average ship weight is for fan and motor assembly.
3. Dimensions are not to be used for construction.
4. Damper quantity is two.
14
D-4220-2
Twin City Bulletin 4220
Dimensional Data - Accessories
Intake Weather Hood
A
5°
B
C
FAN
SIZE
A
B
C
080
090
100
120
140
160
180
200
13.00
15.00
17.00
22.00
25.00
28.00
32.00
36.00
15.50
17.38
19.13
23.38
25.63
28.88
33.00
36.75
17.81
20.13
21.75
28.25
30.81
34.75
39.50
43.81
Notes:
1.Quantity of two (2) hoods required for Model
DBT, Twin Duct Blower.
2.Includes inlet screen, which mounts to fan
housing or to optional filter box, if ordered. Screen does not mount to hood.
Backdraft Damper
A
SQR.
5"
REF
3"
S
AIRFLOW
6"
OPEN
POSITION
FAN
SIZE
A
080
090
100
120
140
160
180
200
10.50
11.75
13.13
16.38
18.25
20.44
22.88
25.63
Notes:
1.Quantity of two (2) dampers required for Model
DBT, Twin Duct Blower.
2.Available as automatic or motorized.
15
Twin City Bulletin 4220
Dimensional Data - Accessories
Filter Box (Single)
C
B
A
D
E
F
H
G
DBS
SIZE
A
B
C
D
E
F
G
H
080
090
100
120
140
160
180
200
17.19
18.19
19.31
19.63
19.09
23.81
23.09
21.75
13.13
15.00
16.69
21.25
23.50
26.75
30.88
34.63
1.00
1.00
1.00
1.00
1.50
1.50
1.50
2.00
1.50
1.50
1.50
2.00
2.00
2.00
2.00
2.00
18.38
20.63
22.25
28.75
32.38
36.25
41.00
45.38
15.38
17.63
19.25
25.75
28.38
32.25
37.00
41.38
1.50
1.50
1.50
2.00
2.00
2.00
2.00
2.00
16.13
18.00
19.69
25.25
27.50
30.75
34.88
38.63
FILTER
SIZE
16
18
20
16
16
18
20
20
x
x
x
x
x
x
x
x
QTY.
16
20
20
20
16
20
20
20
1
1
1
2
4
4
4
4
Filter Box (Twin)
.88 TYP
C
E
B
H
J
D
16
F
F
A
DBT
SIZE
A
B
C
D
E
F
G
H
J
080
090
100
120
140
160
180
200
17.19
18.19
19.31
19.63
19.09
23.81
23.09
21.75
13.13
15.00
16.69
21.25
23.50
26.75
30.88
34.63
1.00
1.00
1.00
1.00
1.50
1.50
1.50
2.00
1.50
1.50
1.50
2.00
2.00
2.00
2.00
2.00
36.63
41.13
44.50
57.50
64.75
72.50
82.00
90.75
15.38
17.63
19.25
25.75
28.38
32.25
37.00
41.38
1.50
1.50
1.50
2.00
2.00
2.00
2.00
2.00
16.13
18.00
19.69
25.25
27.50
30.75
34.88
38.63
2.92
2.92
2.92
2.92
3.92
3.92
3.92
3.92
FILTER
SIZE
16
18
20
16
16
18
20
20
x
x
x
x
x
x
x
x
16
20
20
20
16
20
20
20
G
QTY.
2
2
2
4
8
8
8
8
Twin City Bulletin 4220
Dimensional Data - Accessories, Assembled
Model DBS (Single)
INTAKE
WEATHER
HOOD
2.00
FILTER
BOX
DUCT
BLOWER
E
H
D
E
SQR.
C
B
A
F
G
DBS
A
B
C
D
E
SQR.
F
G
H
080
090
100
120
140
160
180
200
23.31
24.31
28.31
33.81
34.09
38.09
43.09
47.59
17.19
18.19
19.31
19.63
19.09
23.81
23.09
21.75
13.00
15.00
17.00
22.00
25.00
28.00
32.00
36.00
16.13
18.00
19.69
25.25
27.50
30.75
34.88
38.63
10.50
11.75
13.06
16.38
18.31
20.44
22.88
25.63
1.31
1.31
1.31
1.31
1.63
1.63
1.63
1.63
18.38
20.63
22.25
28.75
32.38
36.25
41.00
45.38
4.00
4.44
4.63
6.25
7.00
8.00
9.00
10.00
Note:
Dimensions are not to be used for construction.
17
Twin City Bulletin 4220
Dimensional Data - Accessories, Assembled
Model DBT (Twin)
2.00
INTAKE
WEATHER
HOOD
FILTER
BOX
DUCT
BLOWER
J
E
K
G TYP
E
C
B
A
D
H
F
DBT
A
B
C
D
E
SQR.
F
G
H
J
K
080
090
100
120
140
160
180
200
23.31
24.31
28.31
33.81
34.09
38.09
43.09
47.59
17.19
18.19
19.31
19.63
19.09
23.81
23.09
21.75
13.00
15.00
17.00
22.00
25.00
28.00
32.00
36.00
16.13
18.00
19.69
25.25
27.50
30.75
34.88
38.63
10.50
11.75
13.06
16.38
18.31
20.44
22.88
25.63
1.31
1.31
1.31
1.31
1.63
1.63
1.63
1.63
0.75
0.75
0.75
0.88
0.88
0.88
1.00
1.00
36.63
41.13
44.50
57.50
64.75
72.50
82.00
90.75
7.75
8.75
9.13
12.38
14.00
15.75
18.13
19.75
4.00
4.44
4.63
6.25
7.00
8.00
9.00
10.00
Note:
Dimensions are not to be used for construction.
18
Twin City Bulletin 4220
Typical Specifications
Forward curved inline duct blowers shall be model DBS (single) or model DBT (twin) as manufactured by Twin City
Fan Companies Ltd., Minneapolis, MN.
BLOWER HOUSING - Heavy gauge galvanized steel blower housings with removable access panels.
FAN HOUSING - Fan housings are constructed of galvanized steel for corrosion resistance. For fan sizes up to 18"
the housing sides and scroll are spot welded together to form a durable assembly. For fan size 20" the side plates
are lock formed to the scroll for a durable, air tight construction without compromising the galvanized surface coating of the metal.
WHEEL - Double width, double inlet fan wheels are constructed of galvanized steel, forward curve blades, tab locked
into the end rings. A galvanized structural steel plate mounted in the center of the wheel supports the shaft and
stabilizes the blades.
SHAFTS - Shafts are formed from C40 carbon steel. The shafts are ground, polished and ring gauged for accuracy.
Fan assemblies are provided with coated shafts for enhanced corrosion protection. Single solid shafts are standard
on all sizes.
BEARINGS - Deep groove, self aligning ball bearings are permanently lubricated and sealed. The bearings are mounted
inside a rubber isolator and attached directly to the fan housing with a three (sizes 8-12) or four (sizes 14-20) prong
mount.
MOTORS - All motors shall be single phase or three phase induction, permanently lubricated, heavy-duty, ball bearing type, closely matched to the fan load and provided at the voltage, phase, hertz and enclosure as provided on
the fan schedule.
DRIVES - Motor sheaves shall be cast iron, and supplied as variable pitch standard. Drives and belts shall be rated
for a minimum of 150% of the required motor HP.
WARRANTY - The manufacturer shall guarantee the workmanship and materials for models DBS and DBT for at least
one (1) year from startup or eighteen (18) months from the date of shipment, whichever occurs first.
19
Twin City Bulletin 4220
Industrial & Commercial Fans
Centrifugal Fans | Utility Sets | Plenum & Plug Fans | Inline Centrifugal Fans
Mixed Flow Fans | Tubeaxial & Vaneaxial Fans | Propeller Wall Fans | Propeller Roof Ventilators
Centrifugal Roof & Wall Exhausters | Ceiling Ventilators | Gravity Ventilators | Duct Blowers
Radial Bladed Fans | Radial Tip Fans | High Efficiency Industrial Fans | Pressure Blowers
Laboratory Exhaust Fans | Filtered Supply Fans | Mancoolers | Fiberglass Fans | Custom Fans
Twin city fan & blower | www.tcf.com
A Twin City Fan Company
2MWG02/11
5959 Trenton Lane N | Minneapolis, MN 55442 | Phone: 763-551-7600 | Fax: 763-551-7601