TURNING AIR INTO SOLUTIONS. COMPACT PLENUM FANS ECLFN ECLQN

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1 TURNING AIR INTO SOLUTIONS. COMPACT PLENUM S ECLFN ECLQN CATALOG 456 July 2017

2 PLENUM S Overview ECLFN I ECLQN Plenum fans are unhoused fans designed to operate inside of field-fabricated or factory-built air handling units. The fan wheel pressurizes the entire surrounding air plenum in which the fan is installed, allowing air ducts from any direction to be directly connected to the air handling unit enclosure. This design generally saves space by eliminating the fan housing, transitions, and diffusers within the air handling unit. Plenum fans have found a ready acceptance in the air conditioning industry. In addition, the construction versatility, adaptability in the direction of the discharges, suitability for internal isolation and application of sound panels, and generally lower cost makes it a very popular fan arrangement. Now Available with GridSmartTM EC Motors Maximum Axial Length EPLFN ECLFN see page 4 Model ECLFN 16.5" to 27.00" wheel diameters Airflow to 19,465 CFM Static pressure to 7" w.g. Model ECLQN 16.5" to 27.00" wheel diameters Airflow to 15,500 CFM Static pressure to 7" w.g. Configurations Vertical and Horizontal Wheel Type Airfoil Certifications AMCA Sound/Air and FEG Twin City Fan & Blower certifies that the Model ECLFN and Model ECLQN Plenum Fans 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. See Fan Selector Program for sound power levels. FS10 For complete product performance, drawings, and available accessories, ownload Fan Selector 10 at tcf.com. 2 TWIN CITY - CATALOG 456

3 PLENUM S Application ECLFN I ECLQN Benefits of a Plenum Fan Saves Space There are no housings, transitions or diffusers within the air handling unit. The EC series plenum fans utilize an axial flux motor that allows for an even greater reduction in the fan's footprint than traditional plenum fans. Efficiency Plenum fans can be as efficient or more efficient than scroll type fans at specific operating points towards the bottom of the fan curve. The Axial Flux motors on these fans have the added benefit of being constant efficiency motors, allowing for a greater efficiency even when the motor is not operating at the nominal RPM. Lower Cost These motors do not require a VF to control the speed, resulting in initial cost savings In addition, the higher efficiencies of these motors, compared to standard motors, grants continual cost savings. Vertical Configuration 3

4 ELECTRONICALLY COMMUTATE MOTORS GridSmartTM EC Motors Twin City Fan & Blower offers its own line of custom engineered Electronically Commutated (EC) motors. Electronic commutation is the latest motor technology to be used in direct drive fans. Also known in the industry as Brush Free or Brushless C, the EC motors utilize an electronic circuit board to control the functionality of the motor. The motor operates off of three phase AC power, which is converted to C power within the motor s circuitry. TCF has motor options available for 230V or 460V three phase electrical power for motors of 5HP and below and 460V three phase electrical power for motors of 7.5HP and above. The result is a highly efficient motor, even at part load, with an expanded speed control range and a variety of speed control options from which to choose. Benefits Efficiencies up to 91% IP2X motor enclosure Constant efficiency as the motor speed is varied Up to 66% energy savings over traditional PSC motors Performance range comparable to a belt drive fan with reduced maintenance benefits of a direct drive fan 80% usable turndown range as compared with 40% maximum on PSC motors Soft start gives fans smooth, quiet start Lower operating temperatures result in longer life and reduces energy consumption Heavy-duty ball bearings are permanently lubricated Elimination of VF results in lower initial cost The reduced size of the motor allows for the footprint of the fan to be drastically reduced. Available with 0-10VC control lead for the ECLFN & ECLQN models 4 TWIN CITY - CATALOG 456

5 OPTIONS/ACCESSORIES 1 2 Inlet Mounting Panel Piezometer Ring Protective Enclosure Grill style protective enclosure completely encloses all sides and the back of the fan wheel to protect personnel from moving fan parts. The panels are individually removable to provide access to the wheel for service or inspection. Enclosures are available with or without a panel to enclose the bottom of the fan. Protective enclosures are plated wire. Inlet Mounting Panel esigned to support the fan when mounting directly to a wall or other mounting surface, the inlet mounting plate includes pre-punched mounting holes. The mounting panel extends beyond the outside frame dimensions of the fan. 4 Piezometer Ring The system consists of a piezometer ring mounted at the throat and a static pressure tap mounted on the face of the inlet cone. The pressure drop is measured from the tap located on the face of the inlet cone to the piezometer ring in the throat. The inlet tap is connected to the high pressure side of the transducer and the piezometer ring is connected to the low-pressure side. Other Accessories Include: RIS & Spring Isolators Seismic Isolators (Restrained Isolators) Pressure Transducer/Transmitter w/ isplay (Available with or without NEMA 4 Enclosure) 3 Inlet Screen Heavy-gauge screen mounted to fan inlet for easy removal. 5

6 APPLICATION GUIELINES Location and Placement of Fans in Air Handlers 1. Center the fan inlets in both the horizontal and vertical planes. 2. For inlet clearance, see Figure 1. The flow should converge at an angle not greater than 45 when approaching the opening for the fan inlet. A minimum of one fan wheel diameter clearance is recommended. 3. In the fan outlet plenum, a minimum wall clearance of one-half fan wheel diameter to the periphery of the fan wheel is recommended. 4. Figure 1 shows that the minimum clearance between the back of the fan wheel and the nearest component downstream (im. E) should be one wheel diameter. Small clearances do not allow the flow to equalize behind the fan wheel and the pressure drop of the downstream component is increased. 5. When the flow enters the inlet plenum perpendicular to the fan/motor shaft, large system effect losses can occur. See Figure 2 for a recommended flow baffle or a vortex breaker that may help preserve rated fan performance. 6. When two or more fans are installed in a plenum, divide the plenum into imaginary cells of equal area. Center the fan inlets on each cell. See Figure 3. Figure 1. Recommended Location of Fan in Plenum A A/2 O 45 MAX C L B (A-)/2, BUT NOT LESS THAN '' E ('E' MINIMUM = '') TAKE-OFFS PAST PLANE OF IMPELLER C /2 MINIMUM RECOMMENE Figure 2. Flow Baffle and Vortex Spin Breaker Location Installation Recommendations 1. Install the fan so the flexible connector on the inlet remains uncollapsed during operation. 2. Install thrust restraints (snubbers) to maintain the axial position of the fan when it is generating pressure. 3. Peripheral equipment, such as electrical components, inverters, control panels, etc., should be positioned away from the high velocity air entering or leaving the fan. 4. Adjust springs on the isolation base so that spring deflection is approximately equal for all isolators. 5. Follow safety, installation, start-up and maintenance instructions supplied with each fan. BAFFLE AIRFLOW INLET SPIN BREAKER ACCESSORY /2 Figure 3. Location of Counter-Rotating Fans TWO S THREE S H H H / 2 H / 2 'H' MINIMUM = 2 W / 4 W / 4 'H' MINIMUM = 2 W / 6 W / 6 NOTE: = Wheel diameter W 'W' MINIMUM = 4 W / 2 W 'W' MINIMUM = 6 6 TWIN CITY - CATALOG 456

7 UCT ENTRANCE LOSSES To achieve the air velocity in the discharge duct and overcome the loss associated with the air entering the ductwork, additional resistance must be added to the external static pressure (ESP) requirements of the fan. ifferent types of duct entrances and locations will require varying correction factors. Therefore, prior to selecting a fan, make the following correction, depending upon the type of duct and its location. AITIONAL UCT ENTRANCE LOSS TO BE AE TO ESP ISCHARGE TYPE CORRECTION FACTOR Radial and ducted with bellmouth Radial and ducted without bellmouth Radial without duct or bellmouth Flow parallel to shaft and ducted with bellmouth Flow parallel to shaft and ducted without bellmouth Flow parallel to shaft without duct or bellmouth 1.1 x uct Velocity Pressure 1.4 x uct Velocity Pressure 1.8 x uct Velocity Pressure 1.6 x uct Velocity Pressure 1.9 x uct Velocity Pressure 2.4 x uct Velocity Pressure Example: A system requires 30,000 CFM at 5" SP at standard air density with one 4 ft diameter duct with bellmouth placed in a radial discharge. etermine RPM and brake horsepower: Radial ischarge Without uct or Bellmouth uct area = (4 2 x ρ) 4 = ft 2 uct velocity = 30, = 2387 FPM uct velocity pressure = ( ) 2 = std. cond. Entrance loss correction factor = 1.1 x duct velocity pressure = 1.1 x = 0.39 Thus, select the fan for = 5" " = 5.39" SP Without Bellmouth Flow Parallel To Fan Shaft Bellmouth Radial ischarge ENGINEERING ATA Maximum RPM, Wheel Weights & WR 2 WHEEL ECLFN ECLQN IA. (IN.) MAX RPM (70 F) WT. (LB.) WR 2 (LB-FT 2 ) MAX RPM (70 F) WT. (LB.) WR 2 (LB-FT 2 ) Bare Fan Weights WHEEL IA. (IN.) HORIZONTAL ST. MOUNT WEIGHT (LB.) VERTICAL ST. MOUNT ECLFN ECLQN ECLFN ECLQN

8 PERFORMANCE ATA 165 ECLFN (9-Blade) 165 Wheel iameter: 16.50" Fan Efficiency Grade = FEG75 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: 3468 Outlet Area = ft 2 Max. BHP = x (RPM / 1000) ECLQN (12-Blade) 165 Wheel iameter: 16.50" Fan Efficiency Grade = FEG71 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: 3468 Outlet Area = ft 2 Max. BHP = x (RPM / 1000) 3 Performance certified is for installation Type A; Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate Maximum Static Efficiency. 8 TWIN CITY - CATALOG 456

9 PERFORMANCE ATA 182 ECLFN (9-Blade) 182 Wheel iameter: 18.25" Fan Efficiency Grade = FEG80 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: 2930 Outlet Area = 2.59 ft 2 Max. BHP = x (RPM / 1000) ECLQN (12-Blade) 182 Wheel iameter: 18.25" Fan Efficiency Grade = FEG75 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: 2930 Outlet Area = 2.59 ft 2 Max. BHP = x (RPM / 1000) 3 Performance certified is for installation Type A; Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate Maximum Static Efficiency. 9

10 PERFORMANCE ATA 200 ECLFN (9-Blade) 200 Wheel iameter: 20.00" Fan Efficiency Grade = FEG80 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: ECLQN (12-Blade) 200 Outlet Area = 3.11 ft 2 Max. BHP = x (RPM / 1000) 3 Wheel iameter: 20.00" Fan Efficiency Grade = FEG75 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP RPM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: 2674 Outlet Area = 3.11 ft 2 Max. BHP = x (RPM / 1000) ECLFN (9-Blade) 222 Wheel iameter: 22.25" Fan Efficiency Grade = FEG80 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: ECLQN (12-Blade) 222 Outlet Area = 3.84 ft 2 Max. BHP = x (RPM / 1000) 3 Wheel iameter: 22.25" Fan Efficiency Grade = FEG80 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: 2403 Outlet Area = 3.84 ft 2 Max. BHP = x (RPM / 1000) 3 Performance certified is for installation Type A; Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate Maximum Static Efficiency. 10 TWIN CITY - CATALOG 456

11 PERFORMANCE ATA 245 ECLFN (9-Blade) 245 Wheel iameter: 24.50" Fan Efficiency Grade = FEG85 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP RPM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: ECLQN (12-Blade) 245 Outlet Area = 4.66 ft 2 Max. BHP = 1.88 x (RPM / 1000) 3 Wheel iameter: 24.50" Fan Efficiency Grade = FEG80 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 4" SP 5" SP 6" SP 7" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: 2183 Outlet Area = 4.66 ft 2 Max. BHP = 2.04 x (RPM / 1000) ECLFN (9-Blade) 270 Wheel iameter: 27.00" Fan Efficiency Grade = FEG80 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 3.5" SP 4" SP 4.5" SP 5" SP RPM HP RPM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: ECLQN (12-Blade) 270 Outlet Area = 5.67 ft 2 Max. BHP = 3.04 x (RPM / 1000) 3 Wheel iameter: 27.00" Fan Efficiency Grade = FEG80 /MOTOR MOTOR 0.5" SP 1" SP 1.5" SP 2" SP 2.5" SP 3" SP 3.5" SP 4" SP 4.5" SP 5" SP RPM HP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP / MAXIMUM RPM: 1981 Outlet Area = 5.67 ft 2 Max. BHP = 3.25 x (RPM / 1000) 3 Performance certified is for installation Type A; Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate Maximum Static Efficiency. 11

12 IMENSIONAL ATA Arrangement 4 Horizontal Standard Mount G P J K G A H C A N KC KC L BH MA MA SECTION A-A BH C G H J K KC L MA N P BC IMENSIONS ARE SUBJECT TO CHANGE. CERTIFIE RAWINGS AVAILABLE ON REQUEST. 12 TWIN CITY - CATALOG 456

13 IMENSIONAL ATA Arrangement 4 Horizontal Panel Mount G P J H G H V V/2 A C A V/2 V N KC KC L BH MA MA SECTION A-A BH C G H J KC L MA N P V BC IMENSIONS ARE SUBJECT TO CHANGE. CERTIFIE RAWINGS AVAILABLE ON REQUEST. 13

14 IMENSIONAL ATA Arrangement 4V Vertical Up Standard Mount R G R 4.00 T Q Q G BH N P KC H C J L KC AIR FLOW K MA MA S 3.72 Notes: 1. CW rotation (shown) is standard. CCW rotation (not shown) is optional. 2. Rotation is determined by viewing from the drive end. 3. Vertical Up applications only. BH C G H J K KC L MA N P Q R S T BC IMENSIONS ARE SUBJECT TO CHANGE. CERTIFIE RAWINGS AVAILABLE ON REQUEST. 14 TWIN CITY - CATALOG 456

15 IMENSIONAL ATA Arrangement 4V Vertical own Standard Mount R G R 4.00 G Q Q T BH K L AIR FLOW J KC H C KC P N MA MA S 3.72 Notes: 1. CW rotation (shown) is standard. CCW rotation (not shown) is optional. 2. Rotation is determined by viewing from the drive end. 3. Vertical own applications only. BH C G H J K KC L MA N P Q R S BC IMENSIONS ARE SUBJECT TO CHANGE. CERTIFIE RAWINGS AVAILABLE ON REQUEST. 15

16 IMENSIONAL ATA Arrangement 4V Vertical Up Panel Mount G V/2 H V G H V V/2 BH C P N KC J KC L AIR FLOW MA MA Notes: 1. CW rotation (shown) is standard. CCW rotation (not shown) is optional. 2. Rotation is determined by viewing from the drive end. 3. Vertical Up applications only. BH C G H J KC L MA N P V BC IMENSIONS ARE SUBJECT TO CHANGE. CERTIFIE RAWINGS AVAILABLE ON REQUEST. 16 TWIN CITY - CATALOG 456

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18 TYPICAL SPECIFICATIONS Model ECLFN Fans shall be Model ECLFN cost effective centrifugal plenum (plug) type, as manufactured by Twin City Fan & Blower, Minneapolis, Minnesota. PERFORMANCE Performance ratings shall conform to AMCA Standard 205 (fan efficiency grade), 211 (air performance) and 311 (sound performance). Fans shall be tested in accordance with ANSI/AMCA Standard 210 (air performance) and 300 (sound performance) in an AMCA accredited laboratory. Fans shall be licensed to bear the AMCA certified ratings seal for both sound and air, and fan efficiency grade (FEG). Fans shall have a sharply rising pressure characteristic extending through the operating range and continuing to rise beyond the peak efficiency to ensure quiet and stable operation. Fans shall have a non-overloading design with selflimiting horsepower characteristics and shall reach a peak in the normal selection area. All fans shall be capable of operating over the minimum pressure class limits as specified in AMCA Standard 99. CONSTRUCTION Fans shall be unhoused and incorporate a non-overloading type backward inclined airfoil blade wheel, heavy-gauge galvanized steel frame and inlet plate. FRAME AN INLET PANEL Inlet plates shall be of heavy-gauge galvanized construction. The inlet plate incorporates a removable spun inlet cone designed for smooth airflow into the accompanying inlet retaining ring of the fan wheel. A square, formed lip suitable for attachment of a boot connector shall surround the unit. WHEEL Wheels shall have a spun non-tapered style blade retaining ring on the inlet side to allow higher efficiencies over the performance range of the fan. All wheels on direct drive arrangement 4 fans shall have airfoil shaped, extruded aluminum blades. All wheels shall be continuously welded around all edges. ECLFN wheels shall have nine blades for high efficiencies. All wheels shall be statically and dynamically balanced on precision electronic balancers to a level of G6.3 (per ANSI 2-19) or better. FINISH AN COATING Fan shall be constructed of corrosion resistant galvanized or finish painted steel. Aluminum components shall be unpainted. ACCESSORIES When specified, accessories shall be provided by Twin City Fan & Blower to maintain one source responsibility. FACTORY RUN TEST All fans prior to shipment shall be completely assembled and test run as a unit at the specified operating speed or maximum RPM allowed for the particular construction type. Each wheel shall be statically and dynamically balanced in accordance with ANSI/AMCA "Balance Quality and Vibration Levels for Fans" to Fan Application Category BV-3, Balance Quality Grade G6.3. Balance readings shall be taken by electronic type equipment in the axial, vertical, and horizontal directions. Records shall be maintained and a written copy shall be available upon request. GUARANTEE The manufacturer shall guarantee the workmanship and materials for its ECLFN fans for at least one (1) year from startup or eighteen (18) months from shipment, whichever occurs first. 18 TWIN CITY - CATALOG 456

19 TYPICAL SPECIFICATIONS Model ECLQN Fans shall be Model ECLQN cost effective centrifugal plenum (plug) type, as manufactured by Twin City Fan & Blower, Minneapolis, Minnesota. PERFORMANCE Performance ratings shall conform to AMCA Standard 205 (fan efficiency grade), 211 (air performance) and 311 (sound performance). Fans shall be tested in accordance with ANSI/AMCA Standard 210 (air performance) and 300 (sound performance) in an AMCA accredited laboratory. Fans shall be licensed to bear the AMCA certified ratings seal for both sound and air, and fan efficiency grade (FEG). Fans shall have a sharply rising pressure characteristic extending through the operating range and continuing to rise beyond the peak efficiency to ensure quiet and stable operation. Fans shall have a non-overloading design with selflimiting horsepower characteristics and shall reach a peak in the normal selection area. All fans shall be capable of operating over the minimum pressure class limits as specified in AMCA Standard 99. CONSTRUCTION Fans shall be unhoused and incorporate a non-overloading type backward inclined airfoil blade wheel, heavy-gauge galvanized frame and inlet plate. FRAME AN INLET PANEL Inlet plates shall be of heavy-gauge galvanized construction. The inlet plate incorporates a removable spun inlet cone designed for smooth airflow into the accompanying inlet retaining ring of the fan wheel. A square, formed lip suitable for attachment of a boot connector shall surround the unit. WHEEL Wheels shall have a spun non-tapered style blade retaining ring on the inlet side to allow higher efficiencies over the performance range of the fan. All wheels on direct drive arrangement 4 fans shall have airfoil shaped, extruded aluminum blades. All wheels shall be continuously welded around all edges. ECLQN wheels shall have twelve blades for better sound quality. All wheels shall be statically and dynamically balanced on precision electronic balancers to a level of G6.3 (per ANSI 2-19) or better. FINISH AN COATING Fan shall be constructed of corrosion resistant galvanized or finish painted steel. Aluminum components shall be unpainted. ACCESSORIES When specified, accessories shall be provided by Twin City Fan & Blower to maintain one source responsibility. FACTORY RUN TEST All fans prior to shipment shall be completely assembled and test run as a unit at the specified operating speed or maximum RPM allowed for the particular construction type. Each wheel shall be statically and dynamically balanced in accordance with ANSI/AMCA "Balance Quality and Vibration Levels for Fans" to Fan Application Category BV-3, Balance Quality Grade G6.3. Balance readings shall be taken by electronic type equipment in the axial, vertical, and horizontal directions. Records shall be maintained and a written copy shall be available upon request. GUARANTEE The manufacturer shall guarantee the workmanship and materials for its ECLQN fans for at least one (1) year from startup or eighteen (18) months from shipment, whichever occurs first. 19

20 INUSTRIAL & COMMERCIAL S 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 uct 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 Companies, Ltd. A Twin City Fan Company TWIN CITY & BLOWER Trenton Lane N Minneapolis, MN Phone: Fax: 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.