HRT - Radial Tip Fans
Defining Innovation.
radiaL tip FANS
TYPE HRT
BULLETIN 980
October 2009
HRT Radial Tip Fans
Twin City Fan & Blower’s Type HRT Industrial Duty
Radial Tip Fan line is engineered for higher specific
speeds. It offers a high efficiency selection across
a wider range on the fan curve with a peak static
efficiency reaching 77%. This is accomplished with a
new fan wheel design coupled with an enlarged fan
housing. This design shifts the peak efficiencies to
higher flow rates at a given pressure which allows
selection of a smaller more efficient fan for a given
application. Applications
Radial Tip Fans are of a heavy duty, rugged design
suitable for applications involving large volumes of gas
streams at moderate to high pressures. Designed to
handle clean or dirty airstreams, they are widely used
to exhaust gases from bag-type collectors, precipitators, scrubbers, cyclones and other industrial applications. This type of fan is also used for induced draft
on boilers, incinerators, and kiln exhaust. Steel, air
pollution, dryer, petrochemical, cement, furnaces and
ovens, solvent recovery, sewage sludge, and solid
waste incineration industries have found the Radial
Tip design particularly suitable for their applications.
Choice of Construction
HRT offers two choices of construction:
• HRT 19:Suitable to 19,000 FPM tip speed
Pressures to 22" w.g.
• HRT 23:Suitable to 23,000 FPM tip speed
Pressures to 32" w.g.
For higher static pressure applications refer to Bulletin
950, Type RTF Radial Tip fans.
Typical HRT Curve
SP
BHP
20
400
SE
15
300
10
200
5
100
0
2
4
6
8
10
12
14
100
16
CFM IN 10,000s
1175 RPM
600 HRT
Density: 0.0750 lbs/ft3
80
60
40
20
STATIC EFFICIENCY
500
25
BRAKE HORSEPOWER
STATIC PRESSURE (INCHES OF WATER)
30
The performance
have been tested
industry accepted
by Twin City Fan
formances.
ratings shown in this bulletin
and rated in accordance with
test codes and are guaranteed
& Blower to deliver rated per-
Contents
Introduction. . . . . . . . .
Construction Features . .
Accessories. . . . . . . . .
Optional Construction. . .
Arrangements . . . . . . .
Engineering Data . . . . .
Performance Data. . . . .
Dimensional Data. . . . .
Typical Specifications. . .
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. 2
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. 6
. 6
. 7
. 9
. 13
. 15
©2009 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 anytime without notice.
2
Twin City Bulletin 980
Construction Features
• Higher specific speed and efficient wheel design
allows selection of fan with lower initial and operating cost.
• Radial Tip wheel designed for demanding applications.
• All wheels supplied with welded wear pads on the
blades. Partial blade liners cover approximately
25% of blade area.
• Heavy-gauge reinforced, continuously welded housing and rigid pedestal for vibration-free service.
• Statically and dynamically balanced rotor assembly. Mechanical run test and final balance check of all
fans prior to shipment.
• Interference (shrink) fit between wheel and shaft to
ensure trouble-free operation at high speed, high
temperature and under vibratory load conditions.
• Shaft of AISI 1040 or equal, close tolerances,
turned, ground and polished.
• Anti-friction spherical roller bearings with split pillow block housings on all fans. Typically, L-10
bearing life exceeds 40,000 hours on V-belt drive
and 100,000 hours on direct drive selections.
• Flanged inlet and flanged outlet, housing drain,
ceramic felt type shaft seal (not gas tight) and lifting lugs are standard accessories on all fans.
Arrangement 1 HRT fan with optional evasé and unitary base for the fan and motor.
3
Twin City Bulletin 980
Accessories
Inlet Boxes
Inlet Box Arrrangements
Bolt-on (detached) or attached (integral) type, generously designed to minimize pressure drop. Same
heavy-gauge construction as fan housing. Drain and
bolted access door are standard inlet box acessories. Specify inlet box position referring to AMCA Standard
2405-66 shown below.
Inlet Box
Fan
Inlet Box Positions For Centrifugal Fans
Subbase
360
315
360°
315°
45°
270°
270
Fan with bolt-on (detached) inlet box (shown with
optional subbase). Available on Arrangements 1, 4,
8 and 9F.
45
90
90°
225°
180°
Inlet Box
135°
225
Fan
135
180
INLET BOX POSITIONS AND
DESCRIPTIONS
45— Angular Down Intake
90— Horizontal Right Intake
135— Angular Up Intake
180— Bottom Up Intake
225— Angular Up Intake
270— Horizontal Left Intake
315— Angular Down Intake
360— Top Down Intake
Reference line is the Top Vertical Axis
through center of fan shaft.
Fan with attached or integral inlet box. Available
on Arrangements 1, 4, 8 and 9F. Included on
Arrangements 3SI and 7SI.
Position of inlet box and air entry
to inlet box is determined from drive
side of fan.
Position of inlet box is designated in
degrees clockwise from Top Vertical
Axis as shown.
Positions 135° to 225° in some cases
interfere seriously with floor structure.
Typical Inlet Box Dimensions
L
A
N
“JA”
(FROM O.S.
HSG. TO
INLET
FLANGE)
N
J
JB
“A”
O.S. BOX
“B”
(O.S. BOX)
HA
“G” SP. @ 5.00 = H
J
E
B
“P” QTY. OF HOLES
0.56 DIA. (SIZES 180-450)
0.69 DIA. (SIZES 490-800)
(SIZE 400) “C” SP. @ 5.13 = D
K
Notes:
CL
FAN INLET
1.For inlet box positions 90° to
270°, fan centerline height may
change. Consult factory for centerline height.
2.Consult factory for foundation
mounting location.
“F” (TYP.)
(ALL SIZE) “C” SP. @ 5.00 = D
INLET BOX FLANGE DETAIL
360 INLET BOX POSITION
O
SIZE
270
300
330
360
400
450
490
540
600
660
730
800
A
42.50
46.88
52.13
57.38
63.38
69.38
76.88
84.50
93.50
103.50
114.50
126.50
B
14.38
15.88
17.88
19.38
21.38
23.38
25.88
28.50
31.50
34.88
38.50
42.50
C
7
8
9
10
11
12
14
15
17
19
22
24
D
35.00
40.00
45.00
50.00
56.38
60.00
70.00
75.00
85.00
95.00
110.00
120.00
E
4.63
4.31
4.69
4.81
4.88
6.06
4.81
6.13
6.13
6.13
4.13
5.13
F
0.63
0.63
0.88
0.88
1.13
1.13
1.13
1.13
1.63
1.63
1.63
1.63
G
2
2
2
3
3
3
4
4
5
6
7
7
H
10
10
10
15
15
15
20
20
25
30
35
35
J
3.06
3.81
5.06
3.31
4.56
5.56
4.31
5.63
5.13
4.31
3.63
5.63
K
17.38
18.88
21.88
23.38
26.38
28.38
30.88
33.50
38.50
41.88
45.50
49.50
L
45.50
49.88
56.13
61.38
68.38
74.38
81.88
89.50
100.50
110.50
121.50
133.50
N
1.50
1.50
2.00
2.00
2.50
2.50
2.50
2.50
3.50
3.50
3.50
3.50
P
26
28
30
34
36
38
44
46
52
58
66
70
HA
18.00
19.00
20.50
22.00
23.50
25.50
27.50
29.50
32.00
34.50
37.50
41.00
JA
7.00
7.00
7.00
8.00
10.00
10.00
9.00
12.00
12.00
12.00
12.00
14.00
JB
9.19
9.94
10.94
11.69
12.69
13.69
15.94
17.25
18.75
20.44
23.25
25.25
BC1002143B – DTM-029-06
4
Twin City Bulletin 980
Accessories
Access Doors
Bolted, quick opening, and raised bolted access doors
are available for wheel inspection or maintenance.
catalog to obtain rated performance. Same gauge as
fan housing when purchased from the factory.
Drain
Pie-Shaped Split Housing
/4" NPT coupling welded to the lowest point in the
housing scroll. All fans come with a weep hole in the
bottom of the housing.
Available for wheel removal without disturbing inlet
or outlet duct. All fans are designed for removal of
wheels through inlet as standard. Where access to
inlet is limited or for fans with inlet box, pie-shaped
split housing is recommended. Other split housing
options available. Consult factory for options.
3
Shaft Seal
The standard shaft seal is constructed of non-asbestos woven fibrous materials (ceramic felt) compressed
between an aluminum cover plate and the fan housing. The standard shaft seal is included as a standard
accessory. The ceramic felt shaft seal does not make
the fan gas tight. Special seals are available for low
leakage applications requiring more positive protection. Consult factory for availability.
Shaft Cooler or Heat Slinger
A cast aluminum shaft cooler is recommended to
dissipate the heat and protect the fan bearings for
all applications over 300°F.
Inlet/Outlet Companion Flanges
Companion flanges are used for installing the fan to
flexible sleeve connections and are punched to match
the fan’s inlet or outlet.
OSHA Belt Guard
Belt guard protects personnel from moving drive
parts. Both standard and quick access guards feature solid sides and back and ventilated front. Quick
access guards are only available in W & Z motor
positions.
Shaft & Bearing Guard
Shaft and bearing guard covers both shaft and bearings from incidental contact. Provided with holes for
ease of bearing lubrication. When fan is provided
with shaft cooler, guard extends to cover the shaft
cooler.
Shaft guard covers only the
shaft between the bearings
exposing the bearing to the
ambient conditions.
Evasé
Often
as a
outlet
equal
5
fabricated by customer
part of ductwork. Fan
must be expanded to
evasé area shown in the
Variable Inlet Vanes
Used for efficient volume control for part load conditions. Recommended for use in relatively clean air
applications. Twin City Fan & Blower offers both
space saving nested type (vanes arranged inside the
inlet cone) or bolt-on external type (vanes mounted
inside a cylindrical housing for bolting to the flange)
design. Standard design is suitable for 300°F and
clean air. Construction available for temperatures up
to 600°F is available.
Inlet Box Dampers
Pre-spin design, parallel blade type, heavy-duty construction. The damper will spin the air in the direction
of wheel rotation resulting in a savings in horsepower
at reduced loads.
Outlet Dampers
Double surface airfoil blades. Parallel blade construction as standard with opposed blade construction
available as an option. Available for fan outlet or
evasé outlet.
Unitary Base
A structural steel base provides common support
to fan, motor and drive including guards. This style
of base is designed for use without isolators and
requires adequate foundation integrity for proper
operation.
Isolation Bases
Heavy structural base for fan, motor and
designed for use with spring isolators. Use
ible connectors at inlet and outlet is required
with isolators. Available in Arrangements 1,
8 and 9F.
drive is
of flexon fans
4, 7SI,
Temperature and Vibration Detectors
Thermocouples or RTDs can be installed on the
bearings. Various types of vibration switches are
available.
Twin City Bulletin 980
Optional Construction
High Temperature Construction
Heavier Gauge Construction
301 to 500°F: Requires addition of shaft cooler and
high temperature grease bearings.
501 to 600°F: Above modifications plus high temperature aluminum paint.
601 to 800°F: Above plus modified pedestal design.
Heavier than standard gauge construction is available,
consult factory.
Special Width & Diameter Construction
Variations in wheel widths (50% to 105%) and wheel
diameters (98% to 102%) are available to match
designed performance at motor speeds for the greatest efficiency for any given application.
Abrasion and Corrosion Resistant
Alloys & Coatings
Optional construction includes an abrasion resistant
steel blade and backplate. Construction materials
include Corten, stainless steel, Monel, aluminum,
Hastelloy and other alloys. Special corrosion resistant
coatings of various types are available.
Scroll Liners
7-gauge AR steel material welded in place. Bolted
liners are not recommended. Liners are made out of
T-1 steel. Hard surface overlay type as manufactured
by Tapco or Chamfer available on request.
Side (Cheek) Liners
Covers approximately 25% of the housing sides. Made of 7 gauge AR steel and welded to housing
sides.
Spark Resistant Construction
Fan applications may involve the handling of potentially explosive or flammable particles, fumes or vapors. Such applications require careful consideration by the
system designer to insure the safe handling of such
gases. Twin City Fan & Blower offers the following
classifications of spark resistant construction per
AMCA Standard 99-0401-86. It is the specifier or the
user’s responsibility to specify the type of spark resistant construction with full recognition of the potential
hazards and the degree of protection required.
Type A Consult factory for construction details.
Type B Consult factory for construction details.
Type C The fan shall be so constructed that the
shift of the wheel or shaft will not permit
two ferrous parts of the fan to rub or strike. This is accomplished with an aluminum
inlet cone and rub ring. This construction is
limited to 500°F. Construction to 800°F is
available using a steel inlet cone with copper/bronze lining.
Notes:
1.Bearings shall be placed outside the airstream. Therefore, do not use Arrangement 3 or 7.
2.The user shall electrically ground all fan parts.
Refer to the above listed AMCA standard for full
details.
Arrangements
Arrangement 1
Arrangement 7 SI
The usual choice for many
V-belt drive applications. Wheel is overhung. Steel
bearing pedestal. Check
with the factory for V-belt
drive applications larger
than 300 HP.
Direct coupled with
a flexible coupling. A
single-width, singleinlet fan with an
integral inlet box and
independent bearing
pedestal and bearing/motor
pedestal
installed on a common base. The wheel
is supported between
two bearings.
Arrangement 9F
Floor mount. Similar to Arrangement 1 with the fan
base extended to mount motor in a horizontal position.
Arrangement 3 SI
SWSI fan with integral inlet
box and independent bearing pedestals. The wheel
is supported between two
bearings.
6
Arrangement 8
Direct coupled with a flexible coupling. The motor
pedestal can be custom
fabricated out of steel.
Twin City Bulletin 980
Engineering Data
Material and Mechanical Specifications
SHAFT
FAN
DESIGN
DIA.
SIZE
270
300
330
360
400
450
490
540
600
660
730
800
19
23
19
23
19
23
19
23
19
23
19
23
19
23
19
23
19
23
19
23
19
23
19
23
2.437
2.937
2.437
2.937
2.687
2.937
2.937
3.437
3.437
3.937
3.437
3.937
3.937
3.937
3.937
3.937
3.937
3.937
4.437
4.437
4.437
4.437
4.437
4.437
MAX. HP
MIN.
MAX. HP WHEEL GAUGES
MAX.
V-BELT SHEAVE DIRECT
BACK
RPM**
BLADES SHROUD
DRIVE*
DIA.*
DRIVE
PLATE
75
8.5
100
2688
0.31
10
7
125
7.2
150
3254
0.31
10
7
75
9.6
125
2419
0.31
10
7
150
8.5
200
2928
0.31
10
7
100
10.3
150
2199
0.31
10
7
150
8.6
250
2662
0.31
10
7
150
13.1
200
1988
0.31
10
7
250
9.5
300
2407
0.31
10
7
200
13.1
200
1803
0.38
10
7
300
10.5
400
2183
0.38
7
7
200
8.7
250
1631
0.38
10
7
300
11.6
450
1974
0.38
7
7
250
14.0
300
1481
0.50
7
1/4
300
12.8
550
1793
0.50
7
1/4
300
17.0
400
1338
0.50
7
1/4
300
14.0
650
1619
0.50
7
1/4
300
20.0
450
1210
0.50
7
1/4
300
15.7
850
1464
0.50
7
1/4
300
20.8
550
1100
0.63
7
1/4
300
17.2
1000
1331
0.63
7
1/4
300
21.9
700
994
0.63
7
1/4
300
19.0
1200
1203
0.63
7
1/4
300
22.6
850
899
0.63
7
1/4
300
21.0
1500
1088
0.63
7
1/4
WR2
HOUSING
VALUE
GAUGE
LB-FT2
80
7
82
7
118
7
123
7
175
7
181
7
251
7
259
1/4
443
7
513
1/4
628
7
728
1/4
1289
7
1366
1/4
2061
7
2176
1/4
2920
1/4
3093
1/4
4595
1/4
4846
1/4
6713
1/4
7095
1/4
9895
1/4
10458
1/4
NOTES:
* Minimum sheave diameter when using maximum horsepower motor. Check with factory on applications over 250 HP.
** Maximum fan RPM listed is for carbon steel construction. For stainless steel construction, contact the factory.
Bare Fan Weights (Lbs.)
FAN
Size
270
300
330
360
400
450
490
540
600
660
730
800
Arr. 1
1230
1435
1670
2100
2610
3150
3970
4860
6580
7520
9110
10852
CLASS 19
Arr. 4
Arr. 8
1230
1600
1435
1865
1670
2170
2100
2730
2610
3395
3150
4095
—
5160
—
6320
—
8555
—
9775
—
11845
—
—
Arr. 9F
1290
1505
1755
2205
2740
3310
4170
5105
6910
7895
9565
—
Arr. 1
1290
1485
1720
2480
3030
3710
4550
5680
6740
7950
9620
11562
CLASS 23
Arr. 4
Arr. 8
1290
1675
1485
1930
1720
2235
2480
3225
3030
3940
3710
4825
—
5915
—
7385
—
8760
—
10335
—
12505
—
—
Arr. 9F
1355
1560
1805
2605
3180
3895
4780
5965
7075
8350
10100
—
Size 800 HRT is not supplied with a conventional bearing pedestal. Instead, channel subbases are supplied.
The subbase is to be mounted on concrete pedestal in the field. Concrete pedestal to be supplied by others. Fan weights include weight of channel subbase.
Wheel Weights (Lbs.)
fan
size
270
300
330
360
400
450
490
540
600
660
730
800
7
CLASS
19
144
165
205
232
362
406
634
912
1030
1272
1471
1715
23
147
171
210
238
397
447
659
943
1068
1317
1527
1783
Twin City Bulletin 980
Engineering Data
Performance Correction for Temperature and Altitude
The performance tables in this catalog are based on fans handling standard air at a density of 0.075 pounds per
cubic foot. This is equivalent to 70°F at sea level (29.92 Hg barometric pressure). When specified performance
is at a density different than standard, it must be converted to the equivalent standard conditions before entering the performance tables. The equivalent standard conditions can be calculated by using the “Temperature
and Altitude Density Ratios” from the table below.
Temperature and Altitude Density Ratios
AIR
TEMP
°F
70
100
150
200
250
300
350
400
450
500
550
600
650
700
800
ALTITUDE IN FEET ABOVE SEA LEVEL
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
15000
20000
21.39
0.714
0.676
0.620
0.573
0.533
0.498
0.467
0.440
0.416
0.394
0.375
0.352
0.341
0.326
0.300
20.58
0.688
0.651
0.598
0.552
0.514
0.480
0.450
0.424
0.401
0.380
0.361
0.344
0.328
0.315
0.290
16.89
0.564
0.534
0.490
0.453
0.421
0.393
0.369
0.347
0.328
0.311
0.296
0.282
0.269
0.258
0.237
13.75
0.460
0.435
0.400
0.360
0.344
0.321
0.301
0.283
0.268
0.254
0.242
0.230
0.219
0.210
0.193
BAROMETRIC PRESSURE IN INCHES OF MERCURY
29.92
1.000
0.946
0.869
0.803
0.747
0.697
0.654
0.616
0.582
0.552
0.525
0.500
0.477
0.457
0.420
28.86
0.964
0.912
0.838
0.774
0.720
0.672
0.631
0.594
0.561
0.532
0.506
0.482
0.460
0.441
0.404
27.82
0.930
0.880
0.808
0.747
0.694
0.648
0.608
0.573
0.542
0.513
0.488
0.469
0.444
0.425
0.389
26.82
0.896
0.848
0.770
0.720
0.669
0.624
0.586
0.552
0.522
0.495
0.470
0.448
0.427
0.410
0.375
25.84
0.864
0.818
0.751
0.694
0.645
0.604
0.565
0.532
0.503
0.477
0.454
0.432
0.412
0.395
0.362
24.90
0.832
0.787
0.723
0.668
0.622
0.580
0.544
0.513
0.484
0.459
0.437
0.416
0.397
0.380
0.350
23.98
0.801
0.758
0.696
0.643
0.598
0.558
0.524
0.493
0.466
0.442
0.421
0.400
0.382
0.366
0.336
23.09
0.772
0.730
0.671
0.620
0.576
0.538
0.505
0.476
0.449
0.426
0.405
0.386
0.368
0.353
0.323
22.22
0.743
0.703
0.646
0.596
0.555
0.518
0.486
0.458
0.433
0.410
0.390
0.372
0.354
0.340
0.311
*Minimum sheave diameter when using maximum HP motor. Check with the factory on applications over 300 HP.
Example:
Assume a Model HRT 540 to handle 66,500 CFM at
12" SP at 400°F at an altitude of 1,000 feet.
3.Enter the HRT 540 performance table with 66,500
CFM and 20" SP to find the fan RPM and BHP.
1.Knowing the operating conditions are 400°F and
1,000 feet altitude, the correction factor can be
found in the table above to be 0.594.
The fan RPM is 1273. The brake horsepower is
270.45 BHP at standard conditions (270.45 BHP
is also referred to as “cold” or “starting” brake
horsepower).
2.Divide the operating SP by this factor:
12" ÷ 0.594 = 20.2" SP
This is the equivalent SP at standard air density.
To determine the BHP at operating conditions,
multiply the BHP at standard conditions by the
correction factor from the table above. The BHP at
operating conditions is 270.45 x 0.594 = 160.65.
Derating Factors For High Temperature
TEMP.
STD.
(°F)
STEEL
70
1.000
200
0.968
300
0.949
400
0.929
500
0.901
600
0.873
700
0.844
800
0.814
8
DERATING FACTOR
304
316
STAINLESS
STAINLESS
CONSULT
FACTORY
CONSULT
FACTORY
Standard steel construction is suitable for use in gas
temperatures to 800°F. Aluminum wheels are suitable
for temperatures to 250°F only.
When a fan operates at temperatures higher than
70°F, the maximum RPMs allowable from the table
on page 7 must be adjusted according to the derating factor found in the table at the left.
Stainless steel wheels must be derated even at
ambient operating temperatures. Please consult factory for stainless steel derating factors.
Twin City Bulletin 980
Performance Data
Wheel Diameter: 27.00"
Inlet Area: 2.92 sq. ft.
Tip Speed: 7.07 x RPM
270 HRT
OV
CFM
6060
7790
9530
11260
12990
14720
16450
18190
19920
21650
23380
25110
25980
26850
27710
28580
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
RPM
1140
1196
1276
1370
1476
1591
1713
1840
1971
2106
2244
2383
2454
2525
2596
2668
BHP
5.30
6.70
8.70
11.30
14.58
18.55
23.31
28.98
35.69
43.63
52.86
63.38
69.25
75.46
82.04
89.09
8" SP
RPM
1601
1632
1698
1777
1866
1964
2071
2184
2302
2424
2551
2615
2681
2746
2813
300 HRT
7380
9490
11590
13700
15810
17920
20030
22130
24240
26350
28460
30570
32670
33730
34780
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6200
6400
6600
4" SP
RPM
1025
1073
1142
1225
1318
1419
1527
1638
1755
1874
1996
2119
2244
2307
2370
BHP
6.47
8.17
10.50
13.63
17.53
22.26
27.94
34.61
42.66
52.04
62.98
75.45
89.69
97.49
105.74
330
HRT
CFM
8990
11560
14120
16690
19260
21830
24400
26960
29530
32100
34670
37240
38520
39800
41090
42372
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
12" SP
RPM
1957
1983
2042
2116
2198
2289
2387
2491
2601
2716
2775
2836
2896
2958
BHP
25.31
29.06
33.23
38.32
44.64
52.03
60.42
69.97
80.72
92.69
99.14
106.04
113.09
120.67
16" SP
RPM
2258
2286
2342
2414
2493
2579
2672
2771
2876
2930
2986
3042
3100
BHP
39.58
44.61
50.03
56.44
64.33
73.46
83.67
95.17
108.09
115.02
122.39
129.97
138.03
4" SP
RPM BHP
932
7.87
977
9.95
1041 12.84
1117 16.67
1203 21.50
1296 27.33
1394 34.25
1497 42.55
1603 52.36
1713 64.03
1825 77.54
1938 92.97
1995 101.46
2052 110.46
2110 120.14
2168 130.36
8" SP
RPM
1440
1465
1522
1591
1669
1756
1849
1948
2053
2161
2272
2386
2445
2504
BHP
16.89
19.98
23.51
28.12
33.84
40.60
48.46
57.48
67.82
79.43
92.53
107.34
115.59
124.25
12" SP
RPM
1761
1781
1831
1896
1968
2047
2133
2225
2322
2423
2528
2582
2636
BHP
30.89
35.41
40.43
46.46
54.00
62.76
72.75
84.20
97.06
111.30
127.09
135.65
144.54
16" SP
RPM
2031
2053
2101
2164
2232
2308
2389
2477
2569
2665
2715
2766
BHP
48.28
54.35
60.95
68.57
77.78
88.74
100.89
114.73
130.10
147.02
156.19
165.79
8" SP
RPM BHP
1309 20.53
1333 24.30
1387 28.70
1450 34.37
1522 41.41
1602 49.73
1687 59.35
1779 70.57
1874 83.11
1974 97.53
2076 113.70
2128 122.57
2181 132.06
2234 142.02
2288 152.68
12" SP
16" SP
RPM BHP
1601 37.57
1621 43.14
1668 49.31
1728 56.78
1793 65.93
1866 76.71
1945 88.99
2030 103.13
2119 118.92
2212 136.47
2260 145.97
2308 155.82
2358 166.45
2408 177.50
RPM BHP
1847 58.76
1868 66.16
1913 74.23
1971 83.61
2034 95.03
2103 108.36
2179 123.52
2259 140.39
2344 159.37
2388 169.61
2432 180.14
2478 191.42
2525 203.27
BHP
56.55
62.89
69.68
77.62
86.99
97.97
110.16
123.66
131.00
138.81
146.84
155.37
22" SP
RPM
2640
2661
2709
2776
2849
2929
3014
3107
3155
3205
BHP
62.73
69.43
76.72
84.79
94.14
105.31
117.76
131.72
139.17
147.13
24" SP
RPM
2766
2803
2863
2935
3010
3092
3181
3227
28" SP
BHP
76.17
83.84
92.13
101.65
112.71
125.50
139.84
147.41
RPM
2972
2992
3035
3097
3169
3244
BHP
90.04
98.53
107.62
117.35
128.55
141.46
32" SP
RPM BHP
3177 113.57
3205 123.54
3254 134.03
Outlet Area: 3.97 sq. ft.
Evasé Outlet Area: 5.27 sq. ft.
20" SP
RPM
2270
2295
2344
2406
2474
2547
2626
2710
2799
2845
2892
Wheel Diameter: 33.00"
Inlet Area: 4.31 sq. ft.
Tip Speed: 8.64 x RPM
Performance shown is for installation Type D: Ducted inlet, ducted outlet.
Power rating (bhp) does not include drive losses.
Performance ratings include the effects of an outlet evasé.
9
20" SP
RPM
2524
2556
2613
2685
2761
2845
2935
3031
3081
3133
3185
3239
Wheel Diameter: 30.00" Inlet Area: 3.51 sq. ft.
Tip Speed: 7.85 x RPM
OV
CFM
BHP
13.84
16.40
19.35
23.25
28.04
33.66
40.32
47.92
56.51
66.23
77.37
83.41
89.95
96.72
104.05
Outlet Area: 3.25 sq. ft.
Evasé Outlet Area: 4.33 sq. ft.
22" SP
24" SP
28" SP
32" SP
BHP RPM BHP RPM BHP RPM BHP RPM BHP
69.02 2375 76.56
76.61 2392 84.76 2487 92.97 2674 109.96
84.87 2431 93.49 2517 102.23 2689 120.19 2857 138.60
94.18 2488 103.00 2568 112.16 2724 131.09 2879 150.52
105.45 2553 114.17 2630 123.36 2777 142.75 2920 163.27
118.47 2623 127.44 2697 136.62 2840 156.04
133.08 2698 142.40 2769 151.90 2907 171.55
149.14 2779 159.02 2846 168.88
167.07 2864 177.15 2928 187.41
176.71 2909 187.11
186.78
Outlet Area: 4.81 sq. ft.
Evasé Outlet Area: 6.42 sq. ft.
20" SP
RPM BHP
2064 83.94
2089 93.34
2135 103.47
2192 114.92
2254 128.74
2321 144.72
2394 162.72
2472 182.63
2512 193.29
2553 204.49
2596 216.53
2639 228.87
22" SP
24" SP
28" SP
32" SP
RPM BHP
2160 93.20
2176 103.14
2213 113.83
2266 125.53
2326 139.37
2390 155.63
2459 174.02
2534 194.52
2572 205.24
2612 216.80
2653 228.96
RPM BHP
2262 113.13
2291 124.50
2338 136.56
2396 150.50
2457 166.75
2523 185.49
2595 206.61
2632 217.70
RPM BHP
2431 133.71
2446 146.25
2480 159.71
2529 173.94
2587 190.31
2648 209.30
RPM BHP
2598 168.60
2620 183.34
2658 198.76
Regular unshaded type face = Class 19
Bold shaded type face = Class 23
Underlined figures = Maximum static efficiency
Twin City Bulletin 980
Performance Data
360
HRT
CFM
11040
14200
17360
20510
23670
26820
29980
33130
36290
39450
42600
45760
47330
48910
50490
52070
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
RPM BHP
826
9.28
865 11.78
919 15.03
979 19.02
1049 24.33
1128 30.84
1214 38.59
1303 47.68
1396 58.57
1491 71.34
1586 85.90
1684 102.87
1733 112.13
1782 121.93
1832 132.50
1881 143.44
400 HRT
CFM
13450
17300
21140
24990
28830
32670
36520
40360
44210
48050
51890
55740
57660
59580
61500
63430
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
RPM BHP
749 11.29
785 14.37
834 18.32
888 23.16
952 29.66
1024 37.62
1102 47.07
1184 58.33
1268 71.57
1354 87.12
1441 105.06
1529 125.56
1574 137.00
1618 148.83
1663 161.62
1709 175.43
450
HRT
CFM
16380
21060
25740
30420
35100
39780
44460
49140
53820
58500
63180
67860
70200
72540
74880
77220
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
RPM BHP
678 13.81
709 17.46
753 22.25
802 28.15
860 36.09
924 45.65
994 57.06
1067 70.52
1143 86.60
1220 105.27
1299 127.13
1378 151.82
1419 165.81
1459 180.26
1499 195.52
1540 212.03
Wheel Diameter: 36.50"
Inlet Area: 5.33 sq. ft.
Tip Speed: 9.56 x RPM
8" SP
RPM BHP
1161 24.57
1181 28.50
1228 34.03
1281 40.39
1337 47.57
1401 56.44
1472 67.26
1549 79.73
1631 93.73
1717 109.51
1807 127.58
1852 137.29
1898 147.71
1945 158.89
1991 170.38
12" SP
16" SP
RPM BHP
1420 45.00
1437 50.69
1477 58.22
1530 67.37
1583 77.19
1639 88.10
1703 101.32
1772 116.85
1846 134.44
1925 154.01
1966 164.49
2008 175.52
2051 187.18
2095 199.53
RPM BHP
1638 70.15
1656 77.76
1694 87.51
1746 99.38
1798 111.96
1852 125.64
1911 141.21
1976 159.49
2046 180.62
2082 191.91
2119 203.74
2158 216.40
2197 229.30
8" SP
12" SP
16" SP
RPM BHP
1288 54.80
1303 61.68
1340 70.94
1388 82.06
1436 94.01
1487 107.34
1546 123.67
1608 142.45
1676 164.12
1748 188.07
1785 200.78
1823 214.19
1862 228.39
1902 243.48
RPM BHP
1485 85.34
1502 94.68
1537 106.65
1584 121.07
1632 136.60
1681 153.28
1734 172.10
1793 194.40
1857 220.31
1890 234.20
1924 248.77
1959 264.05
1995 280.03
8" SP
RPM BHP
952 36.43
969 42.36
1007 50.51
1050 59.86
1096 70.55
1148 83.58
1206 99.58
1269 118.05
1336 138.74
1407 162.31
1480 188.82
1517 203.24
1554 218.38
1592 234.70
1631 252.29
12" SP
16" SP
RPM BHP
1165 66.83
1178 75.15
1211 86.37
1254 99.84
1297 114.28
1343 130.48
1395 149.90
1452 173.07
1512 198.91
1577 228.03
1610 243.30
1645 259.92
1680 277.08
1716 295.35
RPM BHP
1343 104.02
1358 115.39
1389 129.84
1431 147.27
1474 166.05
1518 186.24
1566 209.18
1619 236.14
1676 267.27
1706 284.25
1736 301.63
1768 320.42
1800 339.59
22" SP
24" SP
28" SP
32" SP
RPM BHP
1915 111.42
1929 121.50
1960 133.69
2006 148.51
2059 165.31
2112 183.08
2165 201.65
2223 222.62
2254 234.16
2287 246.84
2320 260.06
2354 274.07
RPM BHP
2005 133.81
2030 146.06
2070 161.01
2121 178.49
2174 197.33
2226 216.79
2281 238.03
2310 249.51
2341 261.98
2373 275.24
2406 289.42
RPM BHP
2156 159.94
2168 172.39
2196 187.19
2239 205.31
2291 226.03
2343 247.69
2395 270.35
RPM BHP
2304 200.62
2321 215.26
2353 233.16
2399 254.68
Outlet Area: 7.14 sq. ft.
Evasé Outlet Area: 9.61 sq. ft.
20" SP
RPM BHP
1660 121.54
1679 133.36
1714 148.29
1761 166.22
1809 185.41
1857 205.59
1908 227.83
1965 253.70
1994 267.68
2025 283.02
2057 299.28
2089 315.97
Wheel Diameter: 44.50"
Inlet Area: 7.92 sq. ft.
Tip Speed: 11.65 x RPM
Performance shown is for installation Type D: Ducted inlet, ducted outlet.
Power rating (bhp) does not include drive losses.
Performance ratings include the effects of an outlet evasé.
10
20" SP
RPM BHP
1830 99.77
1851 109.50
1890 121.85
1941 136.42
1994 152.19
2046 168.55
2102 186.73
2165 207.99
2197 219.45
2231 231.98
2266 245.24
2302 259.18
Wheel Diameter: 40.25"
Inlet Area: 6.49 sq. ft.
Tip Speed: 10.54 x RPM
RPM BHP
1053 29.92
1071 34.69
1114 41.45
1163 49.30
1213 57.96
1272 68.91
1336 82.04
1406 97.25
1481 114.43
1559 133.67
1641 155.81
1682 167.70
1724 180.50
1766 193.94
1808 208.04
Outlet Area: 5.90 sq. ft.
Evasé Outlet Area: 7.89 sq. ft.
22" SP
24" SP
28" SP
32" SP
RPM BHP
1737 135.72
1749 147.79
1778 162.84
1820 180.96
1869 201.73
1916 223.01
1964 245.60
2017 271.29
2046 285.72
2075 300.79
2105 316.92
2137 334.53
RPM BHP
1819 163.07
1841 177.79
1878 196.19
1925 217.72
1973 240.64
2020 264.29
2070 290.22
2096 304.09
2124 319.22
2153 335.36
RPM BHP
1955 194.65
1966 209.79
1992 228.00
2031 250.04
2078 275.18
2126 301.91
2173 329.43
RPM BHP
2089 244.07
2106 262.44
2135 284.22
2176 310.08
Outlet Area: 8.72 sq. ft.
Evasé Outlet Area: 11.70 sq. ft.
20" SP
RPM BHP
1501 148.11
1518 162.53
1549 180.54
1591 202.23
1634 225.43
1677 249.83
1723 276.85
1774 308.02
1801 325.42
1828 343.52
1857 363.35
1886 383.70
22" SP
24" SP
28" SP
32" SP
RPM BHP
1571 165.47
1582 180.35
1607 198.29
1645 220.44
1688 245.17
1731 271.32
1774 298.64
1822 329.96
1847 346.84
1874 365.59
1901 385.14
1929 405.97
RPM BHP
1645 198.85
1664 216.48
1697 238.79
1739 264.80
1782 292.51
1825 321.59
1869 352.48
1893 369.64
1918 387.87
1944 407.34
1971 428.31
RPM BHP
1768 237.26
1778 255.86
1800 277.42
1835 304.20
1878 335.11
1921 367.47
1963 400.69
RPM BHP
1889 297.46
1904 319.79
1929 345.73
1966 377.26
Regular unshaded type face = Class 19
Bold shaded type face = Class 23
Underlined figures = Maximum static efficiency
Twin City Bulletin 980
Performance Data
490
HRT
CFM
19950
25650
31350
37050
42750
48450
54150
59850
65550
71250
76950
82650
85500
88350
91200
94050
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
RPM BHP
616 16.81
645 21.31
685 27.15
730 34.41
782 43.97
841 55.73
905 69.71
973 86.56
1042 106.20
1112 129.04
1184 155.83
1257 186.54
1293 203.07
1330 221.04
1367 240.04
1404 260.09
540 HRT
CFM
24500
31500
38500
45500
52500
59500
66500
73500
80500
87500
94500
101500
105000
108500
112000
115500
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
RPM BHP
556 20.58
583 26.19
619 33.35
660 42.32
707 54.07
761 68.70
819 85.94
880 106.53
942 130.53
1006 158.94
1071 191.87
1137 229.66
1170 250.28
1203 272.10
1237 295.87
1270 320.23
600 HRT
CFM
29820
38340
46860
55380
63900
72420
80940
89460
97980
106500
115020
123540
127800
132060
136320
140580
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
RPM BHP
503 25.15
526 31.78
559 40.59
595 51.24
638 65.68
686 83.25
738 104.06
793 129.01
849 158.14
906 192.12
964 231.53
1024 277.62
1053 301.93
1083 328.52
1113 356.64
1144 387.32
Wheel Diameter: 49.00"
Inlet Area: 9.68 sq. ft.
Tip Speed: 12.83 x RPM
8" SP
RPM BHP
865 44.36
880 51.46
915 61.42
955 73.01
997 86.07
1045 102.18
1098 121.79
1155 144.16
1217 169.79
1281 198.29
1348 230.93
1382 248.74
1416 267.42
1451 287.63
1486 308.86
12" SP
16" SP
RPM BHP
1058 81.25
1070 91.34
1101 105.23
1140 121.60
1180 139.49
1222 159.31
1270 183.33
1321 211.21
1377 243.41
1436 278.83
1467 298.03
1498 317.78
1530 338.82
1563 361.29
RPM BHP
1220 126.55
1234 140.42
1262 157.89
1301 179.40
1341 202.68
1381 227.29
1425 255.45
1474 288.85
1525 326.30
1553 347.47
1581 369.14
1609 391.23
1639 415.23
8" SP
12" SP
16" SP
RPM BHP
955 99.51
967 112.25
995 129.29
1030 149.28
1066 171.17
1104 195.51
1148 225.38
1195 260.22
1245 299.37
1299 343.39
1326 366.16
1355 391.25
1384 417.19
1413 444.04
RPM BHP
1102 155.32
1115 172.46
1141 194.24
1176 220.54
1212 249.06
1248 279.18
1288 313.93
1332 354.76
1379 401.54
1404 427.27
1429 453.58
1455 481.39
1482 510.75
8" SP
RPM BHP
706 66.27
718 76.85
747 91.91
779 108.98
813 128.36
852 152.31
895 181.43
942 215.21
992 253.11
1044 295.48
1099 344.51
1126 370.36
1154 398.50
1182 428.03
1211 460.18
12" SP
16" SP
RPM BHP
864 121.58
874 136.85
898 157.01
930 181.55
962 207.88
997 237.97
1036 273.72
1078 315.71
1123 363.25
1170 415.03
1195 443.37
1221 473.67
1247 504.95
1274 538.59
RPM BHP
996 189.23
1007 209.78
1030 236.04
1062 268.36
1094 302.66
1126 338.85
1162 380.97
1202 430.80
1244 487.20
1266 517.81
1289 550.38
1312 583.62
1336 618.86
22" SP
24" SP
28" SP
32" SP
RPM BHP
1427 201.29
1437 219.24
1460 241.14
1496 268.78
1535 298.86
1574 330.65
1614 364.53
1657 402.24
1681 423.78
1705 446.27
1730 470.49
1755 495.52
RPM BHP
1494 241.67
1512 263.41
1543 291.02
1581 322.57
1621 356.91
1659 391.56
1700 429.91
1722 450.96
1745 473.39
1769 497.49
RPM BHP
1606 288.65
1615 311.04
1636 337.81
1669 371.08
1707 407.94
1747 448.02
1785 488.33
RPM BHP
1716 361.84
1730 389.10
1754 421.48
1788 460.08
Outlet Area: 12.96 sq. ft.
Evasé Outlet Area: 17.50 sq. ft.
20" SP
RPM BHP
1232 221.28
1246 242.69
1273 270.45
1307 302.51
1343 337.70
1379 374.74
1417 415.38
1459 462.22
1481 488.17
1504 516.13
1528 546.01
1552 576.66
Wheel Diameter: 60.00"
Inlet Area: 14.47 sq. ft.
Tip Speed: 15.71 x RPM
Performance shown is for installation Type D: Ducted inlet, ducted outlet.
Power rating (bhp) does not include drive losses.
Performance ratings include the effects of an outlet evasé.
11
20" SP
RPM BHP
1363 179.95
1379 197.62
1408 219.84
1447 246.63
1486 274.84
1525 304.51
1567 337.52
1614 375.97
1639 397.55
1664 419.98
1690 443.87
1717 469.18
Wheel Diameter: 54.25"
Inlet Area: 11.86 sq. ft.
Tip Speed: 14.20 x RPM
RPM BHP
781 54.38
795 63.17
827 75.48
863 89.67
901 105.72
945 125.77
993 149.92
1045 177.66
1100 208.58
1159 244.30
1219 284.08
1250 306.16
1281 329.36
1313 354.52
1344 380.11
Outlet Area: 10.56 sq. ft.
Evasé Outlet Area: 14.25 sq. ft.
22" SP
24" SP
28" SP
32" SP
RPM BHP
1289 247.06
1298 269.01
1319 295.99
1351 329.50
1387 366.99
1422 405.81
1459 448.16
1498 494.64
1519 520.41
1541 548.38
1564 578.61
1587 609.81
RPM BHP
1350 296.89
1366 323.37
1394 357.21
1429 396.45
1465 438.53
1500 481.71
1537 528.81
1557 554.81
1578 582.63
1599 611.50
RPM BHP
1450 353.78
1459 381.82
1479 415.51
1508 455.62
1543 501.50
1578 549.56
1613 599.73
RPM BHP
1550 444.03
1563 477.72
1585 517.75
1616 565.38
Outlet Area: 15.79 sq. ft.
Evasé Outlet Area: 21.30 sq. ft.
20" SP
RPM BHP
1113 269.29
1126 295.76
1149 328.52
1180 367.82
1213 411.13
1244 454.60
1279 504.79
1316 560.54
1336 592.19
1357 626.47
1378 661.84
1400 699.62
22" SP
24" SP
28" SP
32" SP
RPM BHP RPM BHP RPM BHP RPM BHP
1165 300.95
1173 327.81 1220 361.72 1311 431.43
1192 360.81 1234 393.66 1319 465.78 1401 541.18
1220 400.89 1259 434.73 1336 505.78 1412 581.57
1253 447.05 1290 481.88 1362 554.56 1431 629.30
1284 493.65 1322 532.43 1393 609.68 1459 687.41
1317 544.73 1354 585.47 1425 668.69
1352 600.98 1387 642.19 1456 728.91
1371 632.36 1405 673.71
1390 665.06 1424 707.60
1411 702.08 1443 742.68
1431 738.83 1463 780.84
Regular unshaded type face = Class 19
Bold shaded type face = Class 23
Underlined figures = Maximum static efficiency
Twin City Bulletin 980
Performance Data
660
HRT
CFM
36120
46440
56760
67080
77400
87720
98040
108360
118680
129000
139320
149640
154800
159960
165120
170280
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
RPM BHP
457 30.40
478 38.43
508 49.07
541 62.05
580 79.49
624 100.92
671 125.96
721 156.16
772 191.48
824 232.78
877 280.76
931 336.02
958 366.17
986 399.28
1013 433.05
1041 470.02
730
HRT
CFM
44100
56700
69300
81900
94500
107100
119700
132300
144900
157500
170100
182700
189000
195300
201600
207900
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
4" SP
800 HRT
CFM
54040
69480
84920
100360
115800
131240
146680
162120
177560
193000
208440
223880
231600
239320
247040
254760
OV
1400
1800
2200
2600
3000
3400
3800
4200
4600
5000
5400
5800
6000
6200
6400
6600
8" SP
RPM BHP
642 80.31
653 93.14
679 111.21
709 132.37
739 155.30
775 184.68
814 219.88
857 261.02
902 306.46
950 358.56
999 416.74
1025 449.92
1050 483.43
1076 520.02
1101 556.94
12" SP
16" SP
RPM BHP
785 146.95
795 165.95
817 190.50
846 220.18
875 252.00
906 287.68
942 331.49
980 382.12
1021 439.73
1065 504.16
1088 538.94
1111 574.71
1135 613.21
1159 653.07
RPM BHP
906 229.52
916 254.40
937 286.30
965 324.36
995 366.83
1024 410.56
1057 461.94
1093 521.81
1131 589.80
1151 626.85
1172 666.41
1193 706.79
1215 749.75
8" SP
12" SP
16" SP
4" SP
12" SP
16" SP
22" SP
24" SP
28" SP
32" SP
RPM BHP
1059 364.28
1067 397.54
1084 437.21
1110 486.44
1139 540.98
1168 598.63
1197 658.87
1229 727.24
1247 766.53
1265 807.57
1283 850.31
1302 896.49
RPM BHP
1109 437.80
1122 476.78
1145 526.84
1173 583.68
1202 644.74
1231 708.79
1262 779.29
1278 816.83
1295 857.33
1312 899.28
1331 947.23
RPM BHP
1192 522.60
1199 563.74
1214 611.44
1238 670.96
1267 739.09
1296 810.39
1324 882.96
RPM BHP
1274 655.75
1284 704.62
1301 761.92
1327 833.26
Outlet Area: 23.28 sq. ft.
Evasé Outlet Area: 31.50 sq. ft.
20" SP
RPM BHP
915 398.69
925 436.96
944 485.55
970 544.54
996 606.60
1023 673.82
1051 746.54
1082 830.36
1098 876.17
1115 926.23
1132 977.90
1150 1033.53
22" SP
24" SP
28" SP
32" SP
RPM BHP
958 445.88
964 484.86
979 532.73
1003 593.71
1029 659.90
1055 729.83
1082 805.09
1111 888.85
1126 933.72
1142 982.99
1159 1037.02
1176 1092.93
RPM BHP
1003 535.62
1015 583.79
1035 643.69
1060 712.55
1087 788.83
1112 864.37
1140 950.37
1154 994.98
1170 1046.08
1186 1098.99
1202 1154.20
RPM BHP
1078 639.09
1084 688.97
1098 748.24
1119 819.63
1145 902.40
1171 988.96
1197 1079.46
RPM BHP
1152 801.69
1161 861.51
1176 930.81
1199 1016.80
Outlet Area: 28.46 sq. ft.
Evasé Outlet Area: 38.60 sq. ft.
20" SP
22" SP
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
373 45.30
391 57.65 525 120.36
415 73.33 534 139.61 642 220.30
442 92.76 555 166.46 649 247.46 740 342.76
474 118.94 579 197.61 667 284.13 748 379.69 827 487.88 866 545.96
510 151.04 604 232.43 691 328.86 766 428.75 837 536.48 872 594.74
548 188.10 633 275.84 715 376.90 789 485.96 854 595.68 886 654.34
589 233.40 665 328.64 741 431.43 813 548.52 877 666.84 907 727.44
631 286.66 700 389.94 770 496.27 837 614.59 901 744.04 931 809.81
674 349.24 737 458.29 801 571.93 864 691.56 925 825.31 954 894.14
717 420.62 776 535.75 834 656.99 893 780.07 950 913.46 978 985.06
761 503.10 817 624.93 870 753.45 924 881.60 978 1015.96 1005 1090.07
783 548.10 837 671.65 889 806.01 941 938.96 993 1073.76 1019 1146.53
805 595.70 858 723.14 908 860.10 958 997.70 1008 1133.86 1033 1205.41
828 648.32 879 777.23 927 915.89 975 1057.65 1024 1199.29 1048 1270.32
850 701.48 900 834.01 947 976.69 993 1122.02 1040 1266.46 1064 1341.10
Performance shown is for installation Type D: Ducted inlet, ducted outlet.
Power rating (bhp) does not include drive losses.
Performance ratings include the effects of an outlet evasé.
12
20" SP
Wheel Diameter: 80.75"
Inlet Area: 26.35 sq. ft.
Tip Speed: 21.14 x RPM
8" SP
Outlet Area: 19.09 sq. ft.
Evasé Outlet Area: 25.80 sq. ft.
RPM BHP
1012 326.19
1024 358.42
1045 398.17
1073 445.54
1103 497.99
1132 551.84
1163 611.41
1197 679.54
1215 717.58
1234 758.92
1253 801.59
1273 847.30
Wheel Diameter: 73.00"
Inlet Area: 21.48 sq. ft.
Tip Speed: 19.11 x RPM
RPM BHP RPM BHP RPM BHP RPM BHP
413 37.10
432 46.93 581 98.42
459 59.88 590 113.63 710 179.76
489 75.81 614 136.03 718 202.20 819 280.34
524 96.99 640 161.07 738 232.27 828 310.78
563 122.68 668 189.77 764 268.27 847 349.81
606 153.59 700 225.14 791 308.00 872 395.93
651 190.28 735 267.84 819 351.59 899 447.63
697 233.28 774 318.22 851 404.34 925 500.68
744 283.64 815 374.19 885 465.60 955 563.68
792 342.30 858 437.26 922 535.85 987 635.69
841 410.00 902 507.80 961 613.06 1022 720.02
865 446.19 925 547.39 982 655.89 1040 765.13
890 486.08 948 588.97 1003 699.96 1059 813.53
914 526.55 971 632.63 1024 745.42 1078 862.94
939 571.02 994 678.44 1046 794.70 1097 913.26
Wheel Diameter: 66.00"
Inlet Area: 17.57 sq. ft.
Tip Speed: 17.28 x RPM
24" SP
28" SP
32" SP
RPM BHP
906 654.26
917 713.42
936 788.87
959 874.30
983 966.61
1006 1060.36
1031 1164.74
1044 1220.60
1058 1281.53
1072 1344.64
1087 1414.29
RPM BHP
974 781.39
980 843.70
993 917.13
1012 1004.59
1035 1104.32
1059 1211.99
1082 1320.96
RPM BHP
1041 980.51
1049 1053.12
1064 1142.39
1084 1245.04
Regular unshaded type face = Class 19
Bold shaded type face = Class 23
Underlined figures = Maximum static efficiency
Twin City Bulletin 980
13
Twin City Bulletin 980
DIMENSIONS NOT TO BE USED FOR CONSTRUCTION. CERTIFIED DRAWINGS AVAILABLE UPON REQUEST.
14
Twin City Bulletin 980
DIMENSIONS NOT TO BE USED FOR CONSTRUCTION. CERTIFIED DRAWINGS AVAILABLE UPON REQUEST.
Typical Specifications
Furnish and install as shown on the plans, Type HRT Radial Tip Fan as manufactured by Twin City Fan &
Blower, Minneapolis, Minnesota. The fan shall conform to the following requirements.
WHEEL — Blade design shall be forward curved at the entering edge to meet air at the correct angle of entry
for high efficiency, and radial at the tip of the leaving edge providing a self-cleaning characteristic.
Blades shall be die-formed of special alloy material for strength and accuracy of contour and continuously
welded to the wheel cone and backplate. All wheels shall be supplied with welded wear pads. A heavy cast iron or fabricated steel hub shall be provided.
Wheels shall be shrunk fit on the shafts and hubs shall include puller holes for use in wheel removal.
All wheels shall be statically and dynamically balanced on precision electronic machines, as well as balance
tuned after complete assembly.
HOUSING — Casings shall be made of heavy-gauge steel with continuously welded construction and braced
with structural shapes to eliminate any resonant vibration and provide smooth operation. Flanged inlet and outlet,
shaft seal, and drain shall be provided as standard equipment.
SHAFT — Shafts shall be solid material selected for AISI 1040 or 1045 hot rolled steel, accurately turned,
ground, polished, and ring gauged for accuracy.
Shaft design shall be of sufficient diameter to allow the first critical speed to be at least 1.35 times the maximum fan operating speed.
BEARINGS — Fans must be supplied with heavy-duty, self-aligning grease or oil lubricated anti-friction spherical
roller bearings with split pillow block housings to provide long bearing life.
FACTORY TEST RUN — All Arrangement 1 and Arrangement 9F fans shall be completely assembled and test
run as a unit at operating speed or at the maximum RPM allowed for the particular construction type. Balance
shall be taken by electronic equipment and records maintained of the readings of axial, vertical, and horizontal
direction on each of the bearings. A written copy of this record shall be available upon request by the customer.
GUARANTEE — Manufacturer shall guarantee the workmanship and materials for its Radial Tip Fans for at
least one year from startup or eighteen months from shipment, whichever occurs first. 15
Twin City Bulletin 980
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
1MWG12/10
5959 Trenton Lane N | Minneapolis, MN 55442 | Phone: 763-551-7600 | Fax: 763-551-7601
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