Defining Innovation. INDUSTRIAL FANS TYPE RBO RBR RBA RBW RBP - CLASS 22 & 32

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1 efining Innovation. INUSTRIAL FANS TYPE RBO RBR RBA RBW RBP - CLASS 22 & 32 BULLETIN 902 June 2011

2 RB Industrial Fans Class 22 & 32 Industrial Fans for Efficiency, ependability, and Versatility The Series 900 Industrial Fans manufactured by Twin City Fan & Blower are well suited for installations involving exhaust, material conveying, pollution control, air circulation, and a variety of other industrial applications. The typical performance characteristics for different wheels offered in Series 900 fans are illustrated below. It should be noted that all wheels essentially have overloading characteristic type brake horsepower curves; however, type RBA wheels have this to a lesser degree than other types. While the general pressure characteristic curve is similar for all Series 900 wheels, the RBA type wheel is considerably more efficient than other Series 900 wheels. Therefore, the RBA wheel is the first choice where brake horsepower savings are important, but the RBA wheel is limited to handling relatively clean air or gases. Efficiency is critical in most applications, and it is important that the fan size is selected so that it will operate at or near its maximum efficiency point. This is particularly important with the units that have lower efficiency in general, such as the RBO and RBW wheels. Typical Performance Characteristic Curves for Industrial Wheels RBO, RBR RBA RBW % STATIC PRESSURE % BRAKE HORSEPOWER % STATIC PRESSURE % BRAKE HORSEPOWER % STATIC PRESSURE % BRAKE HORSEPOWER CFM IN % WOV CFM IN % WOV CFM IN % WOV RB Series Availability Size Wheel Type Rotatable Reversible Class 22 Class 32 housing discharge rotation Arrangements Arrangements 905 RBO YES YES 1,8,9A,9B, RBO YES YES 1,4,8,9A,9B,9F,10 RBA, RBW YES NO 1,4,8,9A,9B,9F,10 RBO YES YES 1,4,8,9A,9B,9F,10 1,4,8,9,9F RBA, RBW YES NO 1,4,8,9A,9B,9F,10 1,4,8,9,9F RBP YES NO 1,9,9F RBO*, RBA, RBW NO NO 1,8,9A,9B,9F,10 1,8,9,9F RBP NO NO 1,9,9F 929 RBO*, RBA, RBW NO NO 1,8,9A,9B,9F 1,8,9,9F RBO*, RBA, RBW NO NO 1,8,9,9F 1,8,9,9F RBO, RBA, RBW NO NO 1,8,9,9F * Note: RBR is standard on size 926 and larger Class 32 fans. Series 900 fan housings are constructed in all usual arrangements and conform to AMCA Standard (rive Arrangements for Centrifugal Fans). The fan sizes and wheel diameters conform to AMCA Standard (Sizes for Industrial Centrifugal Fans). AMCA does not have a standard for industrial fans designating class of operation. Twin City Fan & Blower offers three basic categories, based on performance, of industrial fans. Two of the categories are shown in this bulletin: 1. Class 22 suitable for applications involving performance to approximately 22" SP; and 2. Class 32 for performance to 32" SP. Performances shown in the tables on pages 11 through 29 are shown in regular face type to indicate Class 22 fans and in bold face type to indicate Class 32 fans. A separate supplemental bulletin (Bulletin 911) shows the third category: Class 45 high pressure fans capable of reaching performance of approximately 45" SP. Twin City Fan & Blower certifies that the Series 900 type RBO/RBR/RBA/ RBW 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 comply with the requirements of the AMCA Certified Ratings Program. 2 Twin City Bulletin 902

3 Wheel esign Twin City Fan & Blower offers a complete series of wheels to meet the needs of most industrial process and material handling applications. Each wheel is statically and dynamically balanced on electronic RBW Industrial Radial Backplate Wool Wheel: The RBW wheel is constructed to prevent paper shreddings, threads from buffing system exhaust, and other similar matter from hanging up on and wrapping around the spiders and blades. Applications include long, stringy or fibrous materials. RBO Industrial Radial Paddle Wheel: The open type radial paddle wheel design is extremely rugged using heavygauge steel components which are jig assembled for accuracy and consistency. All wheels are welded with care to insure the maximum in strength and reliability. RBO wheels are suitable for general handling of coarse, sticky, heavy, and/or abrasive materials. equipment prior to being assembled in the fan. In addition, each unit is run at or near operating speed after assembly and the balance is fine-tuned as a complete assembly. RBR Industrial Radial Paddle Wheel: The RBR wheel is similar to the RBO, with the addition of end rings. RBR construction is standard on size 926 and larger Class 32 fans. RBR wheels are suitable for general handling of coarse, sticky, heavy, and/or abrasive materials. RBA Industrial Radial Air Handling Wheel: The RBA wheel is a more efficient type of wheel and is used when handling relatively clean air, fumes, vapor exhaust, and air with a light contaminant. The wheel is constructed with heavy-gauge blades welded to both backplate and front ring. RBP Industrial Radial Paper Handling Wheel: This modified RBW wheel features trapezoidal gussets for the extra rugged construction necessary when handling corrugated paper trims, fibrous material, metal trim, and other high impact loading material. A paper deflector cone over the face of the hub helps prevent wrapping of paper around the hub or leading edge of the blades. All RBP fans are supplied with bearing stop blocks and a relieved inlet transition. The relieved inlet transition smooths the flow of paper trim and similar material through the fan. Breaker tabs are offered as an option on the relieved inlet transition to assist in the breakup of material. ue to the nature of the applications, RBP Class 32 construction is limited to 22" SP and RBP Class 45 construction is limited to 32" SP. Use RBW performance tables for RBP fans. The RBP fan is not AMCA licensed. Rotatable and Reversible Configuration The table on page 2 identifies fans that are rotatable or reversible. A fan available in a rotatable configuration indicates that the fan can be rotated in the field to any of the standard discharge locations. A fan available in a reversible configuration indicates that the wheel rotation can be changed in the field from a clockwise to a counterclockwise direction or vice versa. This is possible only on rotatable housings and requires the wheel housing to be removed and reversed. Consult the factory before reversing a fan. See the chart on page 7 for specific configurations and their designations. 3 Twin City Bulletin 902

4 Accessories Access oors Bolted and quick-opening access doors are available for easy access to the fan interior for inspection or cleaning. All access doors are gasketed and are constructed with either evenly-spaced studs or heavy duty hinges and handle-type nuts which require no tools to open. Raised bolted access doors are available for use where insulation is being applied to the outside of the fan. Bolted Access oor Inlet Bell On installations with an open inlet (no ductwork at the inlet of the fan), a streamlining inlet bell is required to achieve the catalog performance. Raised Bolted Access oor Outlet ampers ue to the performance characteristics of industrial fans, a damper on the outlet of the fan is a very efficient way to control volume. An outlet damper can be used to reduce the power consumption of a fan operating at high temperatures or a fan operating in low density gas streams. uring a cold startup, the outlet damper begins in a closed position and is opened gradually as the fan reaches operating temperature. This allows for the use of a smaller motor sufficient to handle the duty at higher temperatures. Twin City Fan & Blower offers two basic styles of outlet dampers: Type 1 is made of single surface blades suitable for clean air applications, pressures to 25" SP and temperatures to 300 F; Type 2 has double surface airfoil blades for abrasive type applications, pressures to 40" SP and temperatures to 800 F. Both types of dampers are available with opposed or parallel blades and can be manually operated or set up for automatic operation. Inlet Bell Quick-Opening Access oor Inlet Vanes For reduced flow situations with relatively clean air, inlet vane type dampers are available to maintain fan efficiency. The inlet vanes are external type attached to the inlet of the fan. Standard construction inlet vanes are suitable in applications up to 300 F. High temperature inlet vanes are also available for temperatures up to 600 F. Outlet amper Inlet Vanes 4 Twin City Bulletin 902

5 Accessories Inlet Boxes An inlet box is designed to minimize pressure drop and airflow losses. Inlet boxes are recommended for applications where uniform flow is difficult to obtain due to limited space or where the air must enter the fan at an angle. Inlet boxes can be either detachable or integral to the fan. This option is available with an inlet box damper to provide increased airflow control. Inlet Box Shaft Coolers Where high temperatures are encountered, the aluminum shaft cooler is recommended for dissipating heat and protecting bearings from the high temperature atmosphere. Shaft Seals The standard shaft seal is a non-asbestos type, sandwiched between two plates and the fan housing, providing a seal for most materials being handled. A variety of special seals, including mechanical type stuffing boxes, is available for gas-tight applications requiring more positive protection. Shaft Cooler rains A pipe coupling can be welded to the lowest point in the housing scroll to allow wash water or condensation to drain. Spark Resistant Construction Three fan constructions are available for spark resistance. The materials used in the construction of these fans minimize the potential of sparks being generated by striking or rubbing components within the airstream. Type A All parts of the fan in contact with the air or gas being handled are made of nonferrous material. (Aluminum wheel construction is limited to 250 F.) Type B The fan has an entirely nonferrous wheel and nonferrous ring around the opening through which the shaft passes. (Aluminum wheel construction is limited to 250 F.) Type C The fan is constructed so that a shift of the wheel or shaft will not permit two ferrous parts of the fan to rub or strike. In applications where aluminum is not suitable, wheels constructed of monel can be furnished for temperatures up to 1000 F. Notes: 1. The user must electrically ground the fan. 2. Standard spark resistant alloy is aluminum. 3. Bearings must not be placed in the air or gas stream. Shaft Seal Other Accessories A large number of other appurtenances and accessories is available from Twin City Fan & Blower, including: Belt guards standard and OS type Split housings Shaft and bearing guards Couplings and coupling guards Wheel liners Scroll liners Weather covers Inlet and outlet screen Special material construction (stainless steel, Monel, etc.) Special coatings and finishes Insulation pins Abrasion resistant construction Common bases with and without isolation Breaker tabs are offered on Series 900 RBP fans as an option on the relieved inlet transition. These tabs assist in the breakup of material as it enters the fan. 5 Twin City Bulletin 902

6 Arrangements The Series 900 fan housings are constructed of heavy-gauge steel with side plates continuously welded to the scroll. Housings are securely braced to prevent vibration and pulsation. Wheel removal is accomplished through the large opening provided at the inlet side of the housing. Lifting lugs are standard on all units. Arrangement 1 Arrangement 1 fans are available in either direct drive (see Arrangement 8 below), or belt driven installations. The belt driven configuration allows the motor to be mounted in any of the four standard motor positions shown on page 7. The choice of a belt driven installation provides greater performance flexibility with the use of belts and sheaves of differing sizes. Arrangement 8 Arrangement 8 fans use a fan shaft and motor direct coupled via a flexible coupling. The integral motor subbase is fabricated of heavy gauge steel and securely reinforced for rigidity. Twin City Fan & Blower can supply wheels in a variety of diameters and differing widths to give the greatest efficiency for any given application. If desired, an Arrangement 1 fan can be set up for direct drive. This requires a concrete motor pedestal to be built in the field. Arrangement 9 Arrangement 9 fans include a motor slide base mounted on the side of the motor pedestal. The motor and drive can be installed at the factory or field installed. Class 22 fans up to size 929 are offered in Arrangements 9A (shorter pedestal for small motors) and 9B (longer pedestals for larger motors). Maximum motor frame sizes for Arrangement 9A and 9B are listed in the table on page 7. Unless otherwise specified, the motor will be installed on the left (L) side of the pedestal on CW fans and on the right (R) side on CCW fans. Arrangement 9F Arrangement 9F (floor mount) fans are recommended when a packaged unit is desired, but required motors are too large to be mounted on the side of the bearing pedestal. In this arrangement, the base is extended to facilitate motor mounting in a horizontal position similar to an Arrangement 1 fan. This arrangement is preferred over Arrangement 9 when larger horsepower motors are being employed. Unless otherwise specified, the motor will be installed on the left (L) side of the pedestal on CW fans and on the right (R) side on CCW fans. Arrangement 9F requires a separate subbase when vibration isolation is required. Arrangement 10 Arrangement 10 fans are suitable for roof or outdoor installations. A weather cover, as shown, provides complete weather protection for motor, shaft, bearings, and drives. This arrangement is limited to Class 22, sizes 905 through 919. Maximum motor sizes allowable in this arrangement are listed in the table on page 7. Larger fan sizes in this arrangement, or larger motor sizes for smaller fans, may be available on special request from the factory. All usual accessories are available in this arrangement. 6 Twin City Bulletin 902

7 Standard Configurations esignations for Rotation and ischarge Clockwise Clockwise Clockwise Clockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise Upblast Top Angular Up Top Horizontal Top Angular own Upblast Top Angular Up Top Horizontal Top Angular own CW 360 CW45 CW90 CW135 CCW360 CCW45 CCW90 CCW135 Clockwise Clockwise Clockwise Clockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise ownblast Bottom Angular own Bottom Horizontal Bottom Angular Up ownblast Bottom Angular own Bottom Horizontal Bottom Angular Up CW 180 CW225 CW270 CW315 CCW180 CCW225 CCW270 CCW315 irection of rotation is determined from the drive side of the fan. On single inlet fans, the drive side is always considered the side opposite the fan inlet. irection of discharge is determined in accordance with the diagrams shown above. Angle of discharge references the horizontal axis of the fan, and is designated in degrees above or below that reference axis. On fans inverted for ceiling suspension or side-wall mounting, the direction of rotation and discharge is determined when the fan is resting on the floor. Maximum Motor Frame Size Size Class 22 Class 32 9A 9B 9 9F F T T 215T 215T 184T T 256T 256T 215T T 256T 284T 256T 256T 286T T 286T 324T 256T 286T 326T T 286T 324T 286T 286T 326T T 326T 326T 286T 326T 365T T 365T 365T 326T 365T 405T T 365T 365T 365T 405T T 365T 365T 365T 445T T 405T 405T 405T 445T T 405T 444T 405T 445T T 445T 405T 445T T 445T 405T 445T T 445T 405T 445T T 445T 405T 445T T 445T 405T 445T T 445T T 445T Motor Positions The drawing above illustrates motor position standards for Arrangement 1 fans. The location of the motor is determined by facing the drive side of the fan and designating the motor position by letters W, X, Y, or Z. 7 Twin City Bulletin 902

8 Engineering ata High Temperature Construction Requirements AVAILABLE TEMPERATURE ( F) TYPE OF BEARING LUBRICATION OTR REQUIREMENTS ARRANGEMENTS Arr. 1, 4, 8, 9 & 10; 20 F To Ball or Roller Grease Standard Fan Arr. 4 limited +300 F to 180 F. Shaft Cooler, Shaft Seal, 300 F To High Temp. Arr. 1, 8, 9, Ball or Roller Expansion and 500 F Grease and 10* Non-Expansion Bearings Arr. 1, 8, 9, & 10*; High Temp. Aluminum Paint, 500 F To High Temp. (Arr. 9 & 10 limited Ball or Roller Shaft Cooler, Shaft Seal, Expansion 800 F Grease to 600 F unless and Non-Expansion Bearings fan is insulated.) 800 F To Ball or Roller High Temp. Consult Factory 1000 F Grease *Arrangement 10 includes insulated pedestal erating Factors for High Temperature erating Factor TEMP. RBO (22,32); RBA (22); (ºF) RBW (22,32) RBA (32); RBP (32) Std Steel Stainless 50 KSI Stainless When elevated temperatures are encountered, maximum RPM allowable as shown below must be derated according to the values given in the table. Standard steel construction is suitable for use in gas temperatures up to 800 F. Aluminum wheels are suitable for temperatures up to 250 F only. For higher maximum RPM or elevated temperatures consult factory. Maximum RPM, Wheel Weights, & WR 2 (Moment of Inertia) Type RBO/RBR Type RBW Type RBA Fan WEL WR 2 MAX. WEL WR 2 MAX. WEL WR 2 MAX. WT. (lb) (LB-FT 2 ) RPM WT. (lb) (LB-FT 2 ) RPM WT. (lb) (LB-FT 2 ) RPM CL 22 CL 32 CL 22 CL 32 CL 22 CL 32 CL 22 CL 32 CL 22 CL 32 CL 22 CL 32 CL 22 CL 32 CL 22 CL 32 CL 22 CL Twin City Bulletin 902

9 Engineering ata Material Specifications Housing Housing RBO/RBR Wheel RBW Wheel RBA Wheel Shaft BRG. COE Fan CLASS 22 CLASS 32 (NOTE 2) (NOTE 2) (NOTE 2) diameter (NOTE 1) Size Side Side CL 22 R CL 32 R Back CL 22 CL 32 Back Wheel CL 22 CL 32 CL CL CL CL Sides Scroll Sides Scroll Plates Plates Blade Rim Blade Rim Plate Blade Blade Plate Cone Blade Blade GA. 10 GA. 12 GA. 10 GA GA. 10 GA. 12 GA. 10 GA GA. 7 GA. 10 GA. 12 GA GA. 10 GA. 12 GA. 10 GA GA. 7 GA. 10 GA. 10 GA GA. 10 GA. 10 GA. 7 GA. 7 GA. 7 GA. 7 GA GA. 7 GA. 7 GA RB GA. 10 GA. 10 GA. 7 GA. 7 GA. 7 GA. 7 GA GA. 7 GA. 7 GA RB GA. 10 GA. 10 GA. 7 GA. 7 GA. 7 GA GA. 7 GA. 7 GA RB GA. 10 GA. 10 GA. 7 GA. 7 GA. 7 GA GA. 7 GA RB GA. 10 GA. 10 GA. 7 GA. 7 GA. 7 GA GA. 7 GA RB RB GA. 7 GA. 10 GA. 7 GA. 7 GA. 7 GA GA. 7 GA RB RB GA. 7 GA. 7 GA GA GA. 7 GA RB RB GA. 7 GA. 7 GA GA. 7 GA RB RB GA. 7 GA. 7 GA GA RB RB GA GA GA RB RB GA GA RB SRB GA GA SRB SRB GA SRB SRB SRB SRB SRB SRB NOTES: imensions are in inches unless otherwise noted. 1. BEARINGS COES: SB Standard-uty Ball such as odge SCAH Heavy-uty Ball such as odge SCMAH or Sealmaster MP Series RB Roller Bearing such as odge S2000 or SKF SYR Series SRB Split Roller Ball such as SKF SAF225 or Linkbelt PLB6800 Series 2. Gauges listed are for standard steel wheel; steel alloy will vary with size and class. 3. Bearing selection is made on the basis of L-10 bearing life to be in no case less than 40,000 hours minimum or L-50 life of 200,000 hours. Bare Fan Weights (lb) arrangements Fan CLASS 22 CLASS A, 9B 9F , 9F NOTE: Weights are less motor, drives and accessories 9 Twin City Bulletin 902

10 Inlet Boxes Typical Inlet Box imensions C B E A F C INLET A B CL CL E AREA F (FT 2 ) x x x x x x x x x x x x x x x x x x Wheel iameter: 8.75" Inlet Area: 0.14 ft2 Outlet Area: 0.15 ft 2 RBO 905 Tip Speed (FPM): 2.29 x RPM Inlet iameter: 5" O.. Outlet imension: 4 1 2" x 4 7 8" 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 5.5" SP " SP 6.5" SP 7" SP 7.5" SP 8" SP 8.5" SP 9" SP 9.5" SP 10" SP 10.5" SP 11" SP MAXIMUM RPM: 5296 Selections above 4000 RPM not recommended. Consult factory. Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

11 907 Wheel iameter: 12.25" Inlet Area: 0.26 ft2 Outlet Area: 0.27 ft 2 RBO 907 Tip Speed (FPM): 3.21 x RPM Inlet iameter: 7" O.. Outlet imension: " x " MAXIMUM RPM: CLASS 22 = 5296 Selections above 4000 RPM not recommended. Consult factory. RBA MAXIMUM RPM: CLASS 22 = 5273 Selections above 4000 RPM not recommended. Consult factory. RBW MAXIMUM RPM: CLASS 22 = 5457 Selections above 4000 RPM not recommended. Consult factory. Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

12 909 Wheel iameter: " Inlet Area: 0.43 ft2 Outlet Area: 0.44 ft 2 RBO 909 Tip Speed (FPM): 4.09 x RPM Inlet iameter: 9" O.. Outlet imension: " x 8 5 8" MAXIMUM RPM: CLASS 22 = 4156 Selections above 4000 RPM not recommended. Consult factory. RBA MAXIMUM RPM: CLASS 22 = 4134 Selections above 4000 RPM not recommended. Consult factory. RBW MAXIMUM RPM: CLASS 22 = 4192 Selections above 4000 RPM not recommended. Consult factory. Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

13 911 Wheel iameter: " Inlet Area: 0.64 ft2 Outlet Area: 0.66 ft 2 RBO 911 Tip Speed (FPM): 5.01 x RPM Inlet iameter: 11" O.. Outlet imension: " x " MAXIMUM RPM: CLASS 22 = 3283 CLASS 32 = 3844 RBA MAXIMUM RPM: CLASS 22 = 3373 CLASS 32 = 4000 RBW MAXIMUM RPM: CLASS 22 = 3495 CLASS 32 = 4016 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

14 913 Wheel iameter: " Inlet Area: 0.87 ft2 Outlet Area: 0.93 ft 2 RBO 913 Tip Speed (FPM): 5.92 x RPM Inlet iameter: 13" O.. Outlet imension: " x " MAXIMUM RPM: CLASS 22 = 2822 CLASS 32 = 3378 RBA MAXIMUM RPM: CLASS 22 = 2812 CLASS 32 = 3337 RBW MAXIMUM RPM: CLASS 22 = 2922 CLASS 32 = 3373 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

15 915 Wheel iameter: " Inlet Area: 1.17 ft2 Outlet Area: 1.24 ft 2 RBO 915 Tip Speed (FPM): 6.84 x RPM Inlet iameter: 15" O.. Outlet imension: " x " MAXIMUM RPM: CLASS 22 = 2485 CLASS 32 = 2923 RBA MAXIMUM RPM: CLASS 22 = 2521 CLASS 32 = 2910 RBW MAXIMUM RPM: CLASS 22= 2531 CLASS 32 = 2921 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

16 917 Wheel iameter: " Inlet Area: 1.58 ft2 Outlet Area: 1.59 ft 2 RBO 917 Tip Speed (FPM): 7.76 x RPM Inlet iameter: " O.. Outlet imension: " x " MAXIMUM RPM: CLASS 22 = 2191 CLASS 32 = 2577 RBA MAXIMUM RPM: CLASS 22 = 2147 CLASS 32 = 2566 RBW MAXIMUM RPM: CLASS 22 = 2232 CLASS 32 = 2576 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

17 919 Wheel iameter: 33" Inlet Area: 1.97 ft2 Outlet Area: 1.97 ft 2 RBO 919 Tip Speed (FPM): 8.64 x RPM Inlet iameter: " O.. Outlet imension: " x " MAXIMUM RPM: CLASS 22 = 1951 CLASS 32 = 2315 RBA MAXIMUM RPM: CLASS 22 = 1928 CLASS 32 = 2304 RBW MAXIMUM RPM: CLASS 22= 2004 CLASS 32 = 2313 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

18 921 Wheel iameter: 36.5" Inlet Area: 2.40 ft2 Outlet Area: 2.41 ft 2 RBO 921 Tip Speed (FPM): 9.56 x RPM Inlet iameter: " O.. Outlet imension: " x 20" MAXIMUM RPM: CLASS 22 =1778 CLASS 32 = 2092 RBA MAXIMUM RPM: CLASS 22 = 1733 CLASS 32 = 2083 RBW MAXIMUM RPM: CLASS 22 = 1791 CLASS 32 = 2091 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

19 923 Wheel iameter: 40" Inlet Area: 2.88 ft2 Outlet Area: 2.90 ft 2 RBO 923 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x 22" MAXIMUM RPM: CLASS 22 = 1623 CLASS 32 = 1910 RBA MAXIMUM RPM: CLASS 22 = 1581 CLASS 32 = 1905 RBW MAXIMUM RPM: CLASS 22 =1635 CLASS 32 = 1912 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

20 926 Wheel iameter: " Inlet Area: 3.68 ft2 Outlet Area: 3.69 ft 2 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x " RBO/R 926 RBO Wheel used for Class 22. RBR Wheel used for Class MAXIMUM RPM: CLASS 22 = 1439 CLASS 32 = 1693 RBA MAXIMUM RPM: CLASS 22 = 1402 CLASS 32 = 1689 RBW MAXIMUM RPM: CLASS 22 = 1449 CLASS 32 = 1696 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

21 929 Wheel iameter: 50.5" Inlet Area: 4.58 ft2 Outlet Area: 4.62 ft 2 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x " RBO/R 929 RBO Wheel used for Class 22. RBR Wheel used for Class MAXIMUM RPM: CLASS 22 = 1286 CLASS 32 = 1513 RBA MAXIMUM RPM: CLASS 22= 1253 CLASS 32 = 1509 RBW MAXIMUM RPM: CLASS 22 = 1295 CLASS 32 = 1515 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

22 933 Wheel iameter: 57.5" Inlet Area: 5.94 ft2 Outlet Area: 5.99 ft 2 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: 28" x " RBO/R 933 RBO Wheel used for Class 22. RBR Wheel used for Class MAXIMUM RPM: CLASS 22 = 1129 CLASS 32 = 1329 RBA MAXIMUM RPM: CLASS 22 = 1100 CLASS 32 = 1325 RBW MAXIMUM RPM: CLASS 22 = 1137 CLASS 32 = 1330 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

23 937 Wheel iameter: " Inlet Area: 7.46 ft2 Outlet Area: 7.51 ft 2 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x " RBO/R 937 RBO Wheel used for Class 22. RBR Wheel used for Class MAXIMUM RPM: CLASS 22 = 1009 CLASS 32 = 1187 RBA MAXIMUM RPM: CLASS 22= 983 CLASS 32 = 1184 RBW MAXIMUM RPM: CLASS 22 = 1015 CLASS 32 = 1188 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

24 941 Wheel iameter: 71.25" Inlet Area: 9.16 ft2 Outlet Area: 9.20 ft 2 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x " RBO/R 941 RBO Wheel used for Class 22. RBR Wheel used for Class MAXIMUM RPM: CLASS 22 = 911 CLASS 32 = 1072 RBA MAXIMUM RPM: CLASS 22 = 888 CLASS 32 = 1070 RBW MAXIMUM RPM: CLASS 22 = 917 CLASS 32 = 1024 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

25 945 Wheel iameter: 78.25" Inlet Area: ft2 Outlet Area: ft 2 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x " RBO/R 945 RBO Wheel used for Class 22. RBR Wheel used for Class MAXIMUM RPM: CLASS 22 = 837 CLASS 32 = 976 RBA MAXIMUM RPM: CLASS 22 = 809 CLASS 32 = 974 RBW MAXIMUM RPM: CLASS 22 = 835 CLASS 32 = 978 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

26 949 Wheel iameter: 85.25" Inlet Area: ft2 Outlet Area: ft 2 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x " RBO/R 949 RBO Wheel used for Class 22. RBR Wheel used for Class MAXIMUM RPM: CLASS 22 = 757 CLASS 32 = 896 RBA MAXIMUM RPM: CLASS 22 = 743 CLASS 32 = 894 RBW MAXIMUM RPM: CLASS 22 = 767 CLASS 32= 900 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

27 954 Wheel iameter: 93.75" Inlet Area: ft2 Outlet Area: ft 2 RBO 954 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x " MAXIMUM RPM: CLASS 22 = 692 RBA MAXIMUM RPM: CLASS 22= 674 RBW MAXIMUM RPM: CLASS 22 = 696 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

28 960 Wheel iameter: " Inlet Area: ft2 Outlet Area: ft 2 RBO 960 Tip Speed (FPM): x RPM Inlet iameter: " O.. Outlet imension: " x 57" MAXIMUM RPM: CLASS 22 = 622 RBA MAXIMUM RPM: CLASS 22 = 607 RBW MAXIMUM RPM: CLASS 22 = 627 Performance certified is for installation type B & : Free or ducted inlet, ducted outlet. Power ratings (BHP) do not include transmission losses. Performance ratings do not include the effects of appurtenances (accessories). Underlined figures indicate maximum static efficiency. Regular face type = Class 22 Bold face type = Class Twin City Bulletin 902

29 imensional ata RBO, RBA, & RBW, Arr. 9A & 9B, Class 22 GA GA. SIES NOTE 4 NOTE 1 HJ ISCH Q HC HN KL SE S IA. SFT X ISCH FLANGE NOTE 1 KS KWY P GB J B OUTSIE A HOUSING ISCH GA. SCROLL C O.. INLET ISCH JA NOTE 5 GC G CW TH ROTATABLE BA BASE ANGLE H N WITH OPTIONAL FLANGE INLET HF HK H HH HC HN HK HF HJ H HK HJ HH CW TA CW TAU CW UB CW BAU CW BH FOUNATION PLAN SIX BH IA. BASE HOLES K K L M FAN HSG FAN SFT M NOTES: 1. Outlet flanges are optional. Flanges are punched per drawing AC CW rotation is shown. CCW rotation is similar but opposite. 3. For 'B' (downblast) see drawing AC Motor location is 'left' for 'CW' rotation and 'right' for 'CCW' rotation. imension 'FR' is Max. Motor Frame. 5. Optional flanged inlet per drawing AC FAN FR A B BA BH C X 9A 9B 9A 9B G GA GB x T 215T x T 256T x T 256T x T 286T x T 286T x T 326T x T 365T FAN H 9A 9B HC H HF HH HJ HK HN J FAN L P WEL K KL KS M N Q S SE 9A 9B 9A 9B IAMETER x x x x x x x AC15074 imensions are not to be used for construction. Certified drawings are available upon request. 29 Twin City Bulletin 902

30 imensional ata RBO, RBA, & RBW, Arr. 1 & 9A, Class 22 MOTOR ARR 9 ONLY GA GA. SIES NOTE 3 ISCH Q HC S IA. SFT KL SE X ISCH FLANGE NOTE 1 KS KWY BA P BASE ANGLE B OUTSIE A HOUSING GB ISCH GA. SCROLL J C O.. INLET ISCH JA NOTE 4 GC G CW TH NON-ROTATABLE H N WITH OPTIONAL FLANGE INLET HP HF H HH HC HF H HH NOTE 1 CW B CW TA CW TAU CW UB CW BAU CW BH NOTE 5 KA KB L M M FAN HSG FAN SFT AH B ONLY NOTES: 1. Outlet flanges punched per drawing AC15146 except 'B' is punched per foundation plan. 'B' "punched" outlet is per drawing AC CW rotation is shown. CCW rotation is similar but opposite. 3. Arrangement 9 motor location is 'left' for 'CW' rotation and 'right' for 'CCW' rotation. imension 'FR' is Max. Motor Frame. 4. Optional flanged inlet per drawing AC Use dimension 'KB' for 'B'. SIX BH IA. BASE HOLES (EIGHT HOLES ON B ) FOUNATION PLAN FAN A AH B BA BH C X FR G GA GB x T x T x T x T FAN GC H H HF HH HP J JA FAN WEL KA KB KL KS L M N P Q S SE IAMETER x x x x AC15063 imensions are not to be used for construction. Certified drawings are available upon request. 30 Twin City Bulletin 902

31 imensional ata RBO, RBA, & RBW, Arr. 9B, Class 22 GA GA. SIES NOTE 3 ISCH Q HC KL SE S IA. SFT X P ISCH FLANGE NOTE 1 KS KWY B OUTSIE A HOUSING GB ISCH GA. SCROLL J C O.. INLET ISCH JA NOTE 4 BA BASE ANGLE GC G CW TH NON-ROTATABLE H N WITH OPTIONAL FLANGE INLET HP HF H HH HC HF H HH NOTE 1 CW B CW TA CW TAU CW UB CW BAU CW BH NOTE 5 KA KB L M M FAN HSG FAN SFT AH SIX BH IA. BASE HOLES (EIGHT HOLES ON B ) FOUNATION PLAN B ONLY NOTES: 1. Outlet flanges punched per drawing AC15146 except angles on 'B' punched per foundation plan. 2. CW rotation is shown. CCW rotation is similar but opposite. 3. Motor location is 'left' for 'CW' rotation and 'right' for 'CCW' rotation. imension 'FR' is Max. Motor Frame. 4. Optional flanged inlet per drawing AC Use dimension 'KB' for 'B'. FAN A AH B BA BH C X FR G GA GB x T x T x T x T FAN GC H H HF HH HP J JA FAN WEL KA KB KL KS L M N P Q S SE IAMETER x x x x AC15075A imensions are not to be used for construction. Certified drawings are available upon request. 31 Twin City Bulletin 902

32 imensional ata RBO, RBA, & RBW, Arr. 1 & 9, Class 22 MOTOR ARR 9 ONLY GA GA. SIES NOTE 3 ISCH Q C HC S IA. SFT KL SE X ISCH FLANGE NOTE 1 KS KWY BA P BASE ANGLE B OUTSIE A HOUSING GB ISCH GA. SCROLL C L J C O.. INLET ISCH JA NOTE 4 GC G CW TH NON-ROTATABLE H N WITH OPTIONAL FLANGE INLET HP HF H HH HC HF H HH A B E F G NOTE 1 CW B CW TA CW TAU CW UB CW BAU CW BH M M AH NOTE 5 KA KB L FAN HSG FAN SFT SIX BH IA. BASE HOLES (EIGHT HOLES ON B ) FOUNATION PLAN B ONLY NOTES: 1. Outlet flanges punched per drawing AC15146 except 'B' is punched per foundation plan. 'B' "punched" outlet is per drawing AC CW rotation is shown. CCW rotation is similar but opposite. 3. Arrg. 9 motor location is 'left' for 'CW' rotation and 'right' for 'CCW' rotation. imension 'FR' is Max. Motor Frame. 4. Optional flanged inlet per drawing AC Use dimension 'KB' for 'B'. FAN A AH B BA BH A B C E F G X x x x x x x x FAN FR G GA GB GC H HC H HF HH HP T T T T T T T FAN WEL J JA KA KB KL KS L M N P Q S SE IAMETER x x x x x x x AC15064A imensions are not to be used for construction. Certified drawings are available upon request. 32 Twin City Bulletin 902

33 imensional ata RBA, RBO, RBP, & RBW, Arr. 1 & 9, Class 32 MOTOR ARR 9 ONLY GA GA. SIES NOTE 3 NOTE 1 HJ ISCH HC HN Q KL SE S IA. SFT X P ISCH FLANGE NOTE 1 KS KWY BA BASE ANGLE B OUTSIE A HOUSING GB ISCH GA. SCROLL J C O.. INLET ISCH JA NOTE 4 GC G CW TH NON-ROTATABLE H N WITH OPTIONAL FLANGE INLET HF HK H HH HC HN HK HF HJ H HK HJ HH CW TA CW TAU CW UB CW BAU CW BH KA KB L M FAN HSG FAN SFT M NOTES: 1. Outlet flanges are optional. Flanges are punched per drawing AC CW rotation is shown. CCW rotation is similar but opposite. 3. Arrg. 9 motor location is 'left' for 'CW' rotation and 'right' for 'CCW' rotation. imension 'FR' is Max. Motor Frame. 4. Optional flanged inlet per drawing AC For 'B' (downblast) see drawing AC SIX BH IA. BASE HOLES (EIGHT HOLES ON B ) FOUNATION PLAN FAN FR A B BA BH C X ARR. 1 ARR. 9 ARR. 9 G GA GB GC x T x T x T x T x T FAN H ARR. 1 ARR. 9 HC H HF HH HJ HK HN J JA FAN L P WEL K KL KS M N Q S SE ARR. 1 ARR. 9 ARR. 1 ARR. 9 IAMETER x x x x x AC15065 imensions are not to be used for construction. Certified drawings are available upon request. 33 Twin City Bulletin 902

34 imensional ata RBA, RBO, RBP, & RBW, Arr. 1 & 9, Class 32 MOTOR ARR 9 ONLY GA GA. SIES NOTE 3 ISCH Q HC S IA. SFT KL SE X ISCH FLANGE NOTE 1 KS KWY BA P BASE ANGLE B OUTSIE HOUSING A GB ISCH GA. SCROLL J C O.. INLET ISCH JA NOTE 4 GC G CW TH NON-ROTATABLE H N WITH OPTIONAL FLANGE INLET HP HF H HH HC HF H HH NOTE 1 CW B CW TA CW TAU CW UB CW BAU CW BH NOTE 5 M M AH KA KB L FAN HSG FAN SFT SIX BH IA. BASE HOLES (EIGHT HOLES ON B ) FOUNATION PLAN B ONLY NOTES: 1. Outlet flanges punched per drawing AC15147 except 'B' is punched per foundation plan. 'B' "punched" outlet is per drawing AC CW rotation is shown. CCW rotation is similar but opposite. 3. Arrg. 9 motor location is 'left' for 'CW' rotation and 'right' for 'CCW' rotation. imension 'FR' is Max. Motor Frame. 4. Optional flanged inlet per drawing AC Use dimension 'KB' for 'B'. FAN FR A AH B BA BH C X ARR. 1 ARR. 9 ARR. 9 G GA GB x T x T x T x T FAN H GC ARR. 1 ARR. 9 HC H HF HH HP J JA KA FAN L P WEL KB KL KS M N Q S SE ARR. 1 ARR. 9 ARR. 1 ARR. 9 IAMETER x x x x AC15066 imensions are not to be used for construction. Certified drawings are available upon request. 34 Twin City Bulletin 902

35 imensional ata RBA, RBR, & RBW, Arr. 1 & 9, Class 32 GA GA. SIES ISCH HC X ISCH FLANGE NOTE 1 P J B OUTSIE A HOUSING ISCH JA NOTE 4 MOTOR ARR 9 ONLY NOTE 3 GC G Q C S IA. SFT CW TH NON-ROTATABLE KL SE KS KWY BA BASE ANGLE H GB ISCH GA. SCROLL N C O.. INLET WITH OPTIONAL FLANGE INLET HP HF H HH HC HF H HH A B E F G NOTE 1 CW B CW TA CW TAU CW UB CW BAU CW BH NOTE 5 KA KB L M M FAN HSG FAN SFT AH SIX BH IA. BASE HOLES (EIGHT HOLES ON B ) FOUNATION PLAN B ONLY NOTES: 1. Outlet flanges punched per drawing AC15147 except 'B' is punched per foundation plan. 'B' "punched" outlet is per drawing AC CW rotation is shown. CCW rotation is similar but opposite. 3. Arrg. 9 motor location is 'left' for 'CW' rotation and 'right' for 'CCW' rotation. imension 'FR' is Max. Motor Frame. 4. Optional flanged inlet per drawing AC Use dimension 'KB' for 'B'. FAN A AH B BA BH C A B C E F G X x x x x x FAN FR ARR. 9 G GA GB H HC H HF HH HP T T T T T FAN WEL J JA KA KB KS L M N P Q S SE IAMETER x x x x x AC15067A imensions are not to be used for construction. Certified drawings are available upon request. 35 Twin City Bulletin 902

36 LC LC imensional ata Arr. 9F, Class 32 P J JA HP HF Q HC KL SE KS KWY B OUTSIE HOUSING A ISCH. C O.. INLET ISCH. CW B H HH A H B HC CW TA C S IA. SFT TH 1 /2 G CW TH V N WITH OPTIONAL G H FLANGE INLET NOTES: 1. Clockwise (CW) rotation shown. Counterclockwise (CCW) rotation is similar but opposite. 2. Sizes 911 through 919 are rotatable. Sizes 921 through 949 are non-rotatable. 3. Optional flanged inlet is shown. See page 38 for dimensional data. 4. Punched outlet flange is optional on sizes 911 through 919 and standard on sizes 921 through 949. See page 38 for dimensional data. 5. Standard Arr. 9F motor location is on the left for CW rotation units, and on the right for CCW rotation units (unless otherwise specified.) 6. Use dimension KB in place of KA for B. S S S (ALL ISCRGES EXCEPT B) (B ONLY) (ALL ISCRGES) "BH" IA. BASE HOLES NOTE 6 MOTOR FAN SFT LC MOTOR LC FAN SFT HF K FAN HSG. KA FAN HSG. K KB LC B FAN HSG. KB ONLY LC KB L T "BH" IA. L BASE HOLES T L T "BH" IA. S M M BASE HOLES S M M AH S M M AH A AH B BH C A B C E F G G H B Others LC MOTOR CW BAU CW TAU HH F LC FAN SFT E CW UB CW BH G HC H HF HH HP J JA K KA KB KL KS x x x x x x x x x x x x x x.63 L P T V MAX. MOTOR B Others M N B Others Q S S SE B Others B Others FRAME T T T T T T T T T T T T T T AC15072F AC15136A AC15137A AC15138B IMENSIONS ARE NOT TO BE USE FOR CONSTRUCTION. CERTIFIE RAWINGS AVAILABLE ON REQUEST. 36 Twin City Bulletin 902

37 imensional ata Arrangement 10 Size 905 HC CL SFT ISCH. A CL OUTS. HSG. Q 1.75 TYP. KS KWY SE KL P B OUTS. HSG. J C O.. INLET KA FOUNATION PLAN TOP VIEW CL HSG. HC CL SFT H HH CL SFT G GC S IA. SFT H CL HSG. KB CL SFT M M 3.13 (4) BH IA. BASE HOLES CW UB CW TAU HN CL SFT CL SFT CW BH CW B Sizes HP HF GA GA. SIES NOTE 1 HJ P J JA NOTE 3 H MOTOR "FR" MAX. FRAME GC G Q HN HC OPTIONAL WEATR COVER 1.00 TYP. CW TH ROTATABLE KL SE X ISCH. FLANGE NOTE 1 KS KWY S IA. SFT B OUTSIE HOUSING A H GB GA. SCROLL N C O.. INLET BA BASE ANGLE ISCH. LC WITH OPTIONAL FLANGE INLET KA KB L M FAN HSG. LC FAN SFT LC M FOUNATION PLAN (6) "BH" IA. BASE HOLES CW B H HH CW TAU HH HC HF CW UB CW TA NOTES: CW BAU CW BH 1. Clockwise (CW) rotation shown, counterclockwise (CCW) rotation is similar but opposite. 2. All sizes are rotatable. 3. Optional flanged inlet shown on sizes 907 through 919. An optional flanged inlet is available on all Arrangement 10 sizes, including size 905. See page 38 for dimensional data. 4. Punched outlet flange is optional on all sizes. See page 38 for dimensional data. 5. Weather cover is optional. 6. All Arrangement 10 fans are available as Class 22 only. A B BH C G GC H HC H HF HH HN J JA KA KB KL KS L M N P Q S SE MAX. MTR x T x T x T x T x T x T x T x T AC15142A IMENSIONS ARE NOT TO BE USE FOR CONSTRUCTION. CERTIFIE RAWINGS AVAILABLE ON REQUEST. 37 Twin City Bulletin 902

38 imensional ata Inlet & Outlet Flanges Inlet Flange O.. C A B C E A B C E () "E" IA. HOLES EQUALLY SPACE B.C. B A I AC15143B Outlet Flange C A C A J E B "K" "L" B E (N) "M" IA. HOLES J (N) "M" IA. HOLES Class 22 C C A B C E F G H J K L M N ANGLE x x x x x x x x x x x x x x x x x x x 3.00 Class 32 A B C E F G H J K L M N ANGLE x x x x x x x x x x x x x x 3.00 IMENSIONS ARE NOT TO BE USE FOR CONSTRUCTION. CERTIFIE RAWINGS AVAILABLE UPON REQUEST. C F "G" "H" S S F C AC15146C AC Twin City Bulletin 902

39 Typical Specifications Fans shall be Type RBO/RBR/RBW/RBA/RBP Industrial Fans, as manufactured by Twin City Fan & Blower, Minneapolis, Minnesota. Performance Fans shall be tested in accordance with AMCA 210 test code for air moving devices and shall be guaranteed by the manufacturer to deliver rated published performance levels. RBO, RBR, RBW and RBA fans shall be licensed to bear the AMCA certified ratings seal for air. Housing Housings shall be continuously welded heavy gauge steel, suitably braced to prevent pulsation. Housings with lock seams or partially welded construction are not acceptable. Class 22 housings shall be constructed of a minimum 12 gauge through 0.31" steel. Class 32 housings shall be constructed of at least 7 gauge through 0.31" steel. Units having wheel diameters of 33" (size 919) and smaller shall be built with adjustable discharge housings which can be field rotated to any of the eight standard positions. Fans with wheel diameters larger than 33" shall be built with a fixed discharge housing and have a flanged type discharge to provide unit rigidity. Wheel All class 22 fan wheels shall be constructed of a minimum 10 gauge through 0.75" thick steel. Class 32 fan wheels shall be constructed of a minimum 7 gauge through 0.75" steel. The spider hubs for RBO wheels shall be fabricated steel or cast steel material. All industrial fan wheels shall be continuously welded. Shaft Shafts shall be AISI 1040 or 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 average bearing life (AFBMA L-50) in excess of 200,000 hours at the maximum fan RPM. V-BELT rive Fan and motor sheaves shall be cast iron fixed pitched drives for service over 10 HP. Small drives may use variable pitch cast iron motor sheaves. The minimum belt service factor is 120% for drives through 25 HP and 150% over 25 HP. Finish and Coating The entire fan assembly, excluding the shaft, shall be thoroughly degreased and deburred before application of a rust-preventative primer. After the fan is completely assembled, a finish coat of paint shall be applied to the entire assembly. The fan shaft shall be coated with a petroleum-based rust protectant. Aluminum components shall be unpainted. Accessories When specified, accessories such as inlet vanes, outlet dampers, companion inlet and outlet flanges, inlet bells, inlet boxes, shaft guards, and wheel and scroll liners 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 on each of the bearings. Records shall be maintained and a written copy shall be available upon request. Guarantee The manufacturer shall guarantee the workmanship and materials for its fans for at least one (1) year from startup or eighteen (18) months from shipment, whichever occurs first. 39 Twin City Bulletin 902

40 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 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 A Twin City Fan Company Twin city fan & blower Trenton Lane N Minneapolis, MN Phone: Fax: MWG12/10