TWIN CITY FAN QIFE Industrial Process And Commercial Ventilation Systems Instruction Manual

QIFE Industrial Process And Commercial Ventilation Systems

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Specifications

• Model: QIFE
• Impeller Diameters: 12.25 to 66 inches
• Maximum Airflow: 71,000 CFM
• Maximum Static Pressure: 8 w.g.
• Certifications: AMCA Seal, UL/CUL 705 listing (File No.
  E158680)

Product Information

The Model QIFE Mixed Flow Induced Flow Exhaust Fans are
specially designed for laboratory fume hood exhaust applications.
They are known for their induced flow capabilities and are
available in various sizes to meet different ventilation
requirements. The fans are designed to dilute contaminated air and
increase plume height without the need for tall stacks.

Construction Details

The QIFE fan features a rigidly constructed inner cylinder tube
that supports the shaft and bearings. The removable discharge cone
provides easy access to the internal components for maintenance.
Drain coupling and nozzle drain are included for effective drainage
and moisture control within the fan housing.

Energy Efficiency

Twin City Fan & Blower’s QIFE fans are designed to work
seamlessly with energy recovery systems, providing efficient
ventilation solutions. These fans comply with energy regulations
and are ideal for environmentally conscious projects seeking
optimal air quality and energy efficiency.

Product Usage Instructions

Application Areas

The QIFE fan is suitable for exhausting laboratory fumes and
hazardous chemicals in environments such as universities, schools,
hospitals, research facilities, laboratories, and wastewater
treatment plants.

Installation

Mount the QIFE fan on a modular mixing plenum box or a
heavy-duty curb cap. Ensure proper drainage of condensate and
precipitation by utilizing the provided drain coupling and nozzle
drain.

Maintenance

Regularly inspect and clean the fan components to ensure optimal
performance. Refer to the product manual for detailed maintenance
instructions.

FAQ

Q: What is the purpose of the QIFE fan?

A: The QIFE fan is designed to exhaust laboratory fumes and
hazardous chemicals while diluting contaminated air and increasing
plume height.

Q: Can the QIFE fan work with energy recovery systems?

A: Yes, the QIFE fan is compatible with energy recovery systems,
providing energy-efficient ventilation solutions.

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Twin City Fan

INDUSTRIAL PROCESS AND COMMERCIAL VENTILATION SYSTEMS

MIXED FLOW INDUCED FLOW EXHAUST FANS
Model QIFE
AMtCeAst2e6d0

CATALOG 1080 | APRIL 2024

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MIXED FLOW FANS

Overview
QIFE

Twin City Fan & Blower certifies that the Model QIFE Mixed Flow Induced Flow Exhaust Fans shown herein are licensed to bear the AMCA Seal. Certified performance data may be found in Twin City Fan & Blower’s Fan Selector software.

Twin City Fan & Blower offers a specially modified version of the QSL fan designated as “QIFE” for induced flow laboratory fume hood exhaust applications, available in sizes 90 through 542.
The QIFE fan consists of a vertically mounted QSL unit with one of three different nozzles and specially designed windband to maximize dilution ratio (overall outlet volume/ lab outlet volume) and plume height.
Mounted on a modular designed mixing plenum box or curb cap, the QIFE is capable of generating an induced flow to meet stringent roof exhaust requirements.
QIFE fans in a standard configuration utilize a heavy-duty curb cap. An optional modular mixing plenum box includes an integrated curb cap.
Benefits of Mixed Flow Fans
Twin City Fan & Blower Model QIFE Mixed Flow Induced Flow Fans combine the benefits of axial flow and centrifugal flow fans with the added benefit of entraining ambient air for a pre-diluted plume. The QIFE has the advantages of an axial fan in its compact design and straight-through airflow combined with a centrifugal fan’s preferred acoustical characteristics and high pressure capabilities. QIFE fans offer superior air and sound performance and the AMCA certified rating seal for air and sound.
Sizes
12.25″ to 66″ impeller diameters
Performance
Airflow to 71,000 CFM Static pressure to 8″ w.g.

Scan the QR code to search Twin City Fan & Blower’s AMCA-certified products.
Model QIFE is available with UL/CUL 705 listing, for electrical, File No. E158680.

2

TWIN CITY FAN – CATALOG 1080

Twin City Fan
For complete product performance, drawings and available accessories, download our Fan Selector software at tcf.com.

MIXED FLOW FANS
Application
QIFE
The QIFE Induced Flow Mixed Flow Exhaust Fan is intended for use in exhausting laboratory fumes and hazardous chemicals in such a manner that diminishes the likelihood of concentrated, contaminant-laden air from being reentrained into the building’s intake or makeup air. This unit is commonly used in exhaust systems for universities, schools, hospitals, research facilities, laboratories and wastewater treatment plants.
Induced flow exhaust fans dilute contaminated air at the outlet as well as increase the outlet volume of the fan. This accelerates the discharge air, increasing plume height without a tall stack.
Energy Recovery Systems
Twin City Fan & Blower’s fume exhaust fans are designed to work seamlessly with energy recovery technology, offering efficient ventilation solutions for various applications. The combination of these fans with energy recovery systems ensures optimal air quality and energy efficiency, making them an excellent choice for environmentally conscious projects.
Energy Regulations
Twin City Fan & Blower supports energy efficiency regulations enacted by the U.S. Department of Energy (DOE) and specific states. The selection and application of fan products is a significant part of these regulations. Engineers and specifiers must understand how to apply TCF products to their specific applications to meet applicable DOE and state regulatory requirements. Twin City Fan & Blower has made significant investments in product testing and development to provide efficient products. Developments in Twin City Fan & Blower’s Fan Selector software are in place to aid your decision in product selection to assist with meeting the efficiency requirements as stipulated in the applicable regulations.

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3

CONSTRUCTION

Inner Cylinder tube is rigidly constructed to support the
shaft and bearings. The removable discharge cone provides full access to the shaft, bearings and fan sheave.
Drain coupling welded to the lowest point of the housing
allows drainage of condensate from fan housing.
Nozzle Drain A drain tube routed to the outside of the
housing allows for drainage of the nozzle tray, reducing the amount of precipitation entering the fan housing.
NOTE: While precipitation entry into the fan and duct system is greatly reduced while the fan is in operation, precipitation may enter in while the fan is not operating. Care must be taken by the system designer, building owner and user to consider precipitation mitigation and moisture draining for the fume exhaust system.

Windbands are designed to maximize plume height
and entrainment air. Constructed of heavy-gauge steel for strength and rigidity, the windband is mounted directly to the fan housing.
Straightening Vanes convert tangential velocity
pressure into useful static pressure, reducing turbulence and increasing efficiency. Extensive testing of various shapes and locations has resulted in the most efficient aerodynamic design of the straightening vanes.
Bolted Access Door for inspection or cleaning of the
impeller.
Weather Cover completely encloses the motor and
V-belt drive from the elements. Provided with slots for ventilation, covers are easily removable for inspection and maintenance.
Heavy-Duty Motor Mounting Platform pivots to
offer easy and positive adjustment of belt tension.
Impeller is designed with die-formed, continuously-
welded single-thickness or airfoil blades for a stable air performance throughout the operating range.
Curb Cap attaches to the fan’s flange for curb mounting.
Standard accessory on QIFE without mixing plenum box.
Extended Lube Lines allow for ease of lubrication on
all sizes.
Stainless Steel Hardware is standard for corrosion
resistance.
Bearings are selected to exceed the L-10 life of 200,000
hours at the maximum operating speed.
Drives – Cast iron, adjustable or fixed pitch drives are
selected for at least 200% of motor horsepower. Adjustable sheaves are provided on motors up to 10 HP, fixed sheaves for 15 HP and above.
V-belt drives with motors and drives mounted by Twin City Fan & Blower are set to the required RPM and test run as a complete assembly and rechecked for balance.
Sealed Belt Tube encloses the belts and drive
components, protecting them from the airstream.
Shaft Seal limits the air entering the inner cylinder and
avoid contact of airstream contaminants with the bearings and V-belt drive. Consists of a Teflon wear pad/plate and a rubber chekseal at the impeller end of the inner cylinder. Please note that a shaft seal does not make the inner cylinder gas tight.

4

TWIN CITY FAN – CATALOG 1080

MOUNTING CONFIGURATIONS

2 x 1 Dual Unit

Single Unit

4 x 1 Quad Unit

3 x 1 Triple Unit

Unique applications require unique configurations. With the Twin City Fan & Blower Modular Mixing Box, multiple configurations are able to be easily created and retrofitted.

Twin City Fan

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5

OPTIONS/ACCESSORIES
1

2 3
6

7 4

5

1 Acoustic Windband Designed to reduce noise of
the fan system by attenuating sound at the fan outlet.
2 Inlet Safety Screens can be provided for
installation in the fan inlet.
3 Isolation Dampers are typically used on multi-fan
systems to isolate individual fans. Isolation dampers are available with 2-position, spring-return controls and various materials of construction and coating options.
4 Bypass Damper are used to maintain outlet
velocities by allowing a constant volume at the fan when exhaust air is reduced. Bypass dampers are available with either a manual, locking quadrant (handle) or with electrical controls and various materials of construction and coating options.

6

TWIN CITY FAN – CATALOG 1080

5 Insulated Roof Curb Standard roof curbs are 12″
high and are constructed of heavy-duty galvanized steel and include 11/2″ thick insulation. Contact factory for other roof curb options. Note: 125 mph windload ratings require a Twin City Fan & Blower supplied roof curb. Parallel backdraft dampers are available for mounting in roof curbs.
6 Mixing Plenum Box w/ Weather Hood; w/
Insulation & Stainless Steel Liner Bottom Intake The mixing plenum box features modular
construction allowing for multiple configurations and effortless retrofitting. Bottom intake is standard, side intake option available upon request.
7 Vortex Breaker Installed in the mixing plenum box
at the fan inlet, the vortex breaker minimizes air `swirl.’ Recommended for multi-fan configurations and where mixing box intakes are not directly across from the inlet of the fan.

OPTIONS/ACCESSORIES
3

2
1
4 4

1 Quick Open Access Doors are designed for
quick impeller inspection and maintenance. Access doors are specified where examination and cleaning of the fan interior is frequently required.
2 NEMA 3R Disconnect Switch, rain proof,
disconnect is available shipped loose for field mounting and wiring or factory mounted and wired. Also avialabe with a NEMA 4 or 7/9 switch.
3 Jib Crane Heavy-duty jib crane is designed to handle
the weight of the heaviest individual component. The mount is connected to the specially reinforced mixing box spacer mixing box structure. Single and double mixing boxes receive one (1) jib crane. 3×1 and 4×1 configurations receive two (2) jib cranes.

4 Mixing Plenum Box w/ Weather Hood; Side
Intake The mixing plenum box features modular
construction allowing for multiple configurations and effortless retrofitting. Bottom intake is standard, side intake option available upon request.
OTHER ACCESSORIES:
· Mixing Box Blank-Off Panel · Piezometer Ring and Pressure Transducer · Spark Resistant Construction: Type C · Stainless Steel Nameplate · Backdraft damper

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7

FUME EXHAUST DEFINITIONS

QT QE
QE QF
QB

QL

QB = Bypass Flow QE = Entrained Flow QF = Fan Flow QL = Laboratory Flow (Contaminated Air) QT = Total Flow
QT = QE + QF QF = QB + QL
QT = QE + QB + QL

Dilution Ratio = D.R. =

QT QL

Entrainment Ratio = E.R. =

QT QF

8

TWIN CITY FAN – CATALOG 1080

Bypass Air
Ambient air that is drawing through the bypass air plenum and mixed with the lab exhaust to increase dilution and plume rise. Bypass air is primarily used in variable volume applications to maintain a constant discharge volume.
Dilution Ratio
The ratio of the total fan outlet volume to the lab exhaust volume. (Total Volume/Lab Exhaust Volume).
Entrainment Air
Air that is entrained (induced flow) through the windband and mixed with the lab exhaust to increase the dilution ratio and plume rise.
Fume Exhaust
Caustic or noxious air that is being exhausted from laboratory or fume hood.
Nozzle
Device located internal to the fan housing, providing fume exhaust air to accelerate upon entrance to the windband. Three nozzles per fan size are available on the QIFE; lowvelocity, medium-velocity and high-velocity. Each nozzle provides different flow characteristics. Nozzle should be selected based on the application requirements.
Plume Rise
The height of the fume exhaust and entrainment air above the discharge of the windband.
Plume Height
Overall height of the discharge plume rise, plus the added height of the exhaust system above the roof-deck level. (See diagram on page 9.)
Total Airflow
The total airflow exiting the windband, including fume exhaust, bypass air and entrainment air.
Windband
Device used to direct the fume exhaust as it leaves the housing of the exhaust fan and entrain dilution air. Also available with an acoustically attenuated option.

AMCA 260 TESTING

The following illustrations describe the procedure for determining the total laboratory exhaust fan discharge flow. The total discharge flow is the sum of inlet airflow and entrained airflow. The key requirement to AMCA 260 is the variable resistance box. This box allows the measurement of total discharge flow (Ps = 0 in. w.g. to simulate discharging the fan to atmosphere) at all points along its fan curve.

Without the variable resistance box, the entrained airflow can only be measured at the free air point of its fan curve. The entrained airflow obtained can be used to calculate an effective plume height. Therefore, AMCA 260 certification is necessary to ensure the laboratory exhaust fan specified is providing the plume rise and entrainment submitted.

AMCA 210 – Figure 15

AMCA 260 – Figure 1

Induced FlowAir

Induced FlowAir

Inlet Airflow
Air Test Chamber

Induced FlowAir

Total Airflow

Total Airflow
Air Test Chamber

Induced FlowAir

Variable Resistance
Box

Inlet Airflow

PLUME HEIGHT CALCULATION

he = hr + hs* he = [3.0 x (V x d/U)] + hs
he = Effective plume height (ft) hr = Plume rise (ft) hs = Stack height (height from roof to outlet of windband) (ft) V = Windband exit velocity (ft/min) d = Windband outlet diameter (ft) U = Crosswind speed (ft/min)

• Equation taken from ASHRAE Laboratory Design Guide, Equation 9-2. Note: Plume height calculations are typically calculated with a 10 mph (880 ft/min) crosswind.

hr he
hs

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9

ENGINEERING DATA

Table 1. Maximum RPM, Impeller Weights and WR2 (moment of inertia in lb-ft2)

FAN SIZE
90 122 135 150 165 182 200 222 245 270 300 330 365 402 445 490 542

MAX. RPM 4225 3450 3137 2721 2483 2232 2027 1839 1655 1505 1360 1234 1116 1013 915 828 752

CLASS I WEIGHT
LB. 9 12 15 24 32 38 48 57 69 82 140 167 233 324 393 478 591

WR2 LB-FT2
1.05 2.15 3.50 5.5 8.0 12 20 29 45 66 133 197 320 588 883 1321 1934

MAX. RPM
­ ­ ­ 3558 3247 2918 2650 2405 2165 1968 1779 1613 1459 1325 1197 1082 984

CLASS II WEIGHT
LB. ­ ­ ­ 28 36 44 52 62 75 90 150 179 247 324 393 478 591

WR2 LB-FT2
­ ­ ­ 7.1 10.3 15 23 34 52 76 145 215 347 588 883 1321 1934

Table 2. Bare Fan and Windband Weights (lb)

FAN SIZE
90 122 135 150 165 182 200 222 245 270 300 330 365 402 445 490 542

COMPLETE FAN WITH WINDBAND

CLASS I CLASS II

327

­

445

­

523

­

553

560

657

665

757

769

921

931

972

984

1134

1144

1313

1329

1703

1733

2075

2094

2208

2237

2721

2746

3208

3240

3926

3942

4866

4899

WINDBAND ONLY
146 214 257 220 262 321 386 355 434 521 633 765 634 763 929 1128 1358

NOTE: Weights do not include motor, mixing plenum box or roof curb. See Table 5 for mixing plenum box weights. Includes bare fan and windband.

Table 3. Temperature and Altitude Density Ratios

AIR TEMP
°F
­50 0 70
100 150 200

0
29.92 1.293 1.152 1.000 0.946 0.869 0.803

1000
28.86 1.247 1.111 0.964 0.912 0.838 0.774

2000
27.82 1.201 1.071 0.930 0.880 0.808 0.747

ALTITUDE IN FEET ABOVE SEA LEVEL

3000

4000

5000

6000

7000

8000

BAROMETRIC PRESSURE IN INCHES OF MERCURY

26.82 25.84 24.90 23.98 23.09 22.22

1.159 1.032 0.896

1.116 0.995 0.864

1.076 0.959 0.832

1.036 0.923 0.801

0.997 0.889 0.772

0.960 0.856 0.743

0.848 0.770 0.720

0.818 0.751 0.694

0.787 0.723 0.668

0.758 0.696 0.643

0.730 0.671 0.620

0.703 0.646 0.596

9000
21.39 0.924 0.824 0.714 0.676 0.620 0.573

10000 15000

20.58
0.889 0.792 0.688
0.651 0.598 0.552

16.89
0.729 0.650 0.564
0.534 0.490 0.453

Table 4. Bearing Specifications

FAN SIZE
90 122 135 150 165 182 200 222 245 270 300 330 365 402 445 490 542

CLASS I

SHAFT DIA. (IN.)

BEARING

0.750

SDB

0.750

SDB

0.750

SDB

1.000

SDB

1.000

SDB

1.000

SDB

1.187

SDB

1.187

SDB

1.437

SDB

1.437

SDB

1.437

HDB

1.687

HDB

1.937

HDB

1.937

RB

1.937

RB

2.187

RB

2.437

RB

CLASS II

SHAFT DIA. (IN.)

BEARING

­

­

­

­

­

­

1.187

SDB

1.437

SDB

1.437

HDB

1.437

HDB

1.437

HDB

1.687

HDB

1.687

RB

1.937

RB

2.187

RB

2.187

RB

2.187

RB

2.437

RB

2.437

RB

2.687

RB

NOTES: 1. BEARINGS CODES:
SDB — Standard-Duty Ball such as Dodge SCAH or SKF SY Series HDB — Heavy-Duty Ball such as Dodge SCMAH or SKF SYM Series RB — Roller Bearing such as Dodge S2000 or SKF SYR Series 2. Standard bearings are selected to exceed L-10 life of 200,000 hours at the maximum operating speed.

Table 5. Mixing Plenum Box Weights (lb)

FAN
SIZE 90 122 135 150 165 182 200 222 245 270 300 330 365 402 445 490 542

SINGLE
269 342 337 439 462 506 519 738 926 952 1135 1320 1449 1588 1814 1999 2208

DOUBLE
554 706 708 906 964 1062 1110 1590 1974 2070 2450 2824 3114 3422 3892 4310 4776

TRIPLE
852 1086 1095 1392 1488 1644 1725 2478 3066 3234 3822 4392 4851 5337 6057 6720 7452

QUAD
1148 1464 1484 1880 2012 2228 2340 3368 4160 4400 5192 5960 6588 7248 8224 9128 10132

NOTES: 1. Weights do not include roof curb or dampers. 2 Weights are for non- insulated, bottom-intake mixing boxes
without jib crane mounting.

10

TWIN CITY FAN – CATALOG 1080

DIMENSIONAL DATA

B

B

CB

I.D.

CK MC
(MAX)

CH
ISOLATION DAMPER (OPTIONAL)
REMOVABLE ACCESS PANEL MIXING PLENUM BOX (OPTIONAL)
NOTE 1 A

1.00

TA

STD.

6.00

NOTE 1

BYPASS DAMPER (OPTIONAL)
CJ

CG O.D.
FR (MAX MOTOR
VIEW B-B FRAME)

CE INSIDE BOX
SQUARE

2.75

2.00 CURB WALL

TYP.

DRAIN STD.
CF ROOF CURB (OPTIONAL)
A

CD OUTSIDE CURB
SQUARE
SECTION A-A

NOTES: 1. Motor position may vary with size. 2. Bottom intake standard; side intake, closed bottom optional. 3. Standard roof curb height is 12″. Other heights available upon request. 4. 125 mph windload ratings require a Twin City Fan & Blower supplied roof curb.

SIZE
90 122 135 150 165 182 200 222 245 270 300 330 365 402 445 490 542

CB
18.13 22.25 24.44 27.06 29.63 32.69 36.31 40.00 44.44 48.88 54.06 59.63 65.94 72.56 80.38 88.88 97.75

CD
23.00 27.00 27.00 32.00 33.00 35.00 36.00 39.00 45.00 46.00 52.00 59.00 64.00 70.00 79.00 86.00 94.00

CE
24.00 28.00 28.00 33.00 34.00 36.00 37.00 40.00 46.00 47.00 53.00 60.00 65.00 71.00 80.00 87.00 95.00

CF
28.13 32.13 32.13 37.13 38.13 40.13 41.13 44.13 50.13 51.13 56.13 59.63 62.13 65.13 69.63 73.13 77.13

CG
25.00 30.63 33.69 37.25 40.50 45.38 50.00 55.06 67.19 67.31 74.44 82.13 90.75 99.94 110.69 122.38 134.63

CH
102.00 120.03 128.09 120.41 129.04 140.54 151.30 142.10 157.85 168.98 185.60 197.91 184.41 196.97 211.85 227.59 245.15

CJ
33.09 37.09 37.09 42.09 43.09 45.09 46.09 49.09 55.09 56.09 60.09 60.09 60.09 60.09 60.09 60.09 60.09

CK
49.44 60.69 66.87 50.44 55.39 61.44 67.69 52.25 58.31 63.94 70.81 77.81 57.81 63.75 70.69 78.31 86.19

FR
184T 184T 184T 215T 256T 256T 256T 256T 286T 286T 326T 326T 365T 365T 405T 405T 445T

MC
22.88 24.25 26.88 25.75 27.75 34.44 36.19 37.63 37.88 42.13 45.13 46.56 51.50 59.75 62.25 67.69 71.50

SHAFT DIAMETER

CL I

CL II

0.75

­

TA 19.44

0.75

­

22.25

0.75

­

24.13

1.00

1.19

27.88

1.00

1.44 30.76

1.00

1.44

34.01

1.19

1.44

37.32

1.19

1.44 40.32

1.44

1.69 44.45

1.44

1.69 48.95

1.44

1.94 54.70

1.69

2.19

60.01

1.94

2.19

66.51

1.94

2.19

73.13

1.94

2.44 81.07

2.19

2.44 89.19

2.44

2.69 98.87

BC1003133D

DIMENSIONS ARE SUBJECT TO CHANGE. CERTIFIED DRAWINGS AVAILABLE ON REQUEST.

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11

TYPICAL SPECIFICATIONS

Model
QIFE
Model QIFE Induced Flow Exhaust Fans, where indicated on drawings and schedules, shall be of the non-overloading design, and shall be of the size and capacity as indicated in the fan schedule. Induced flow exhaust fans shall be as manufactured by Twin City Fan and Blower, Minneapolis, Minnesota.
PERFORMANCE — Fans shall be tested in accordance with AMCA test codes for air moving devices and shall be guaranteed by the manufacturer to deliver rated published performance levels. Model QIFE shall be licensed to bear the AMCA certified ratings seal for air, sound and induced flow FEI. Sound certification shall apply to both inlet and outlet sound power levels. Model QIFE shall be UL/cUL 705 listed for electrical.
Fans shall be designed for maximum efficiency. Fans shall have a sharply rising pressure characteristic extending through the operating range and continuing to rise well beyond the efficiency peak to assure quiet and stable operation under all conditions. Horsepower characteristics shall be truly self-limiting and shall reach a peak in the normal selection area.
HOUSING — Housings shall be cylindrical and welded steel throughout. Inlets shall be fully streamlined. Housings shall be suitably braced to prevent vibration or pulsation. Totally enclosed weather cover shall enclose motor and V-belt drives. Punched inlet flange shall be equipped for curb cap or mixing plenum box mounting. Extended lube lines shall be provided for ease of lubrication. Model QIFE shall include outlet nozzle, windband, heavy-duty coated steel curb cap, access door, shaft seal and weather cover, and a sealed belt tube for the protection of belts and drive components from the airstream.
IMPELLER — Fan impellers shall have die-formed blades designed for maximum efficiency, and quiet and stable operation. Blades shall be continuously- welded to the back plate and impeller cone. Impellers shall be statically and dynamically balanced and the complete fan assembly including motor and drive shall be test balanced at or near the operating speed at the factory prior to shipment.
SHAFT — Shafts shall be AISI 1045 hot rolled steel, accurately turned, ground, polished and ring-gauged for accuracy. Shafts shall be sized for the first critical speed of at least 1.43 times the maximum speed.
BEARINGS — Bearings shall be heavy-duty, grease lubricated, anti-friction ball or roller, self-aligning, pillow block type and selected for a minimum L-10 life of 200,000 hours at the maximum fan RPM. Bearings shall be equipped with extended lubrication lines with grease fittings outside of the fan housing.
DRIVE — Motor sheaves shall be cast iron, variable pitch on applications 10 HP and smaller, and fixed pitch on 15 HP and larger. Drives shall be sized for at least 200% of motor horsepower.
CURB CAP — A heavy-duty, coated steel or galvanized curb cap shall be included to provide for a weather-tight transition between the roof curb and the fan. The curb cap shall allow discharge height up to 10 feet from roof without the need for guy wire support.
NOZZLE AND WINDBAND — A nozzle and windband combination shall be provided to efficiently induce ambient airflow from outside the fan housing and increase discharge velocities to be a recommended minimum of 3,000 FPM without significantly affecting BHP requirements. The windband shall provide a minimum discharge height of between 84″ and 120″ from roof surface.

12

TWIN CITY FAN – CATALOG 1080

TYPICAL SPECIFICATIONS
Model
QIFE (cont’d.)
WEATHER COVER — A raintight, easily removable weather cover shall be provided to completely enclose the motor and exposed parts of the V-belt drive.
OPTIONAL ACCESSORIES — Where required the fans shall be provided with: · AMCA “B” or “C” spark resistant construction · Modular mixing plenum box · Bypass damper with actuator · Isolation damper with actuator · Disconnect switches · Roof curb · Vortex breaker · Special coatings on airstream parts or entire unit · Special materials of construction
SUBMITTALS — Submittals for approval of equipment shall include copies of outline drawings, AMCA Certified Ratings and percentage pressure-volume performance curves showing point of operation.

Twin City Fan

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13

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5959 TRENTON LANE N. | MINNEAPOLIS, MN 55442 | PHONE: 763-551-7600 | FAX: 763-551-7601
©2011-2024 Twin City Fan Companies, Ltd., Minneapolis, MN. All rights reserved. Catalog 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.

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