Twin City Fan & Blower

Transcription

1 Twin City Fan & Blower BULLETIN 4050 November 2009 DOWNBLAST ROOF EXHAUSTERS TYPE DCRD / BCRD (Spun Aluminum Housing) TYPE BCRD-E (Endurex Polymeric Housing)

2 Downblast Roof Exhausters Twin City Fan & Blower s line of quiet, efficient and economical centrifugal roof exhausters are designed to offer world-class performance and quality in a wide variety of commercial and industrial ventilating applications. DCRD Direct Drive Spun Aluminum Housing BCRD-E Belt Driven Endurex Polymeric Housing Model DCRD BCRD Belt Driven Spun Aluminum Housing Model BCRD-E Model BCRD Twin City Fan & Blower certifies that the DCRD, BCRD, and BCRD-E Series shown herein are licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 2 and AMCA Publication 3 and comply with the requirements of the AMCA Certified Ratings Program. DCRD, BCRD and BCRD-E models are culus 705 listed for electrical, File No. E Twin City Fan Companies, Ltd. All rights reserved throughout the world. Bulletin illustrations cover the general appearance of Twin City Fan & Blower products at the time of publication and we reserve the right to make changes in design and construction at any time without notice. 2 Twin City Bulletin 4050

3 BCRD-E Endurex Roof Exhausters, Belt Driven Model BCRD-E belt driven roof exhausters feature a housing constructed of Twin City Fan & Blower's proprietary Endurex polymeric material. The polymeric construction of Endurex provides the same long lasting characteristics as aluminum but with significantly improved impact, weather, corrosion, and UV resistance. To prove our confidence in Endurex we are providing a limited lifetime warranty on all Endurex housing components. Standard Models Available in ten sizes from 070 through 240 Capacities range from 80 to 8,700 CFM, with static pressures to 2.25 inches High-Pressure Models Available in six sizes from 00 through 240 Capacities range from 330 to 7,700 CFM, with static pressures to 3.25 inches Endurex Construction Advantages Impact Resistant - Housing will not dent or crack even in cold weather to -40 o F. Weather Resistant - Resistant to storm damage caused by wind, hail and airborne objects. Corrosion Resistant - Impervious to salt, airborne chemicals and normal weathering. UV Resistant - UV inhibitors provide resistance to ultraviolet light for long years of service. Resists Shipping Damage - Impossible to dent and alter housing shape caused by improper handling. Safe Installation - Provides safe areas to grab for installation and maintenance without sharp metal edges. Ease of Maintenance - Removable top cover provides for belt inspection and maintenance, while the onepiece construction provides easy removal and access to the wheel. C E SQUARE A DIA. CURB SIZE ROOF OPENING (DAMPER SIZE INCHES) B 2.00 CURB DAMPER UL Testing The Endurex housing was tested by UL in accordance with UL 94, 746A, and 746C and is approved as UL 705 listed. The Endurex material underwent rigid testing per these standards, surpassing the requirements of the following: Ultraviolet Light Exposure Testing Samples were exposed to ultra violet light for an equivalent of 500,000 hours (90+ years) to provide the assurance that the material will last a lifetime. Flammability Testing Flame tests performed per UL94, the most widely accepted flammability performance standards for plastic materials, gauged the material s ability to propagate or extinguish a flame once ignited. Impact Resistance Testing Tensile and izod impact tests measured the material s resistance to real life conditions such as, falling objects, blows, collisions, drops, etc. Functional Support Testing Flexural and tensile strength tests to prove the material s structural stability and integrity. Dimensional Data and Weights FAN DIMENSIONS CANTED DAMPER CURB SIZE SIZE AVG. SHIP WT. (LBS.) SIZE A B C E 070D/075D x x D x x D x x D x x D x x D x x D x x D x x D x x Notes:. All dimensions are in inches unless otherwise noted. 2. Dimensions are not to be used for construction. 3. Outside dimensions of dampers are nominal. 4. Self-flashing roof curbs are " larger than canted curbs. Twin City Bulletin

4 DCRD Spun Aluminum Roof Exhausters, Direct Drive Model DCRD direct drive roof exhausters feature spun aluminum construction. Standard Models Available in 4 sizes from 060 through 80 Capacities range from 00 to 5,000 CFM, with static pressures to inch Speed controllable available on all sizes with ODP, 5V motors B Dimensional Data and Weights FAN DIMENSIONS CANTED CURB SIZE DAMPER SIZE AVG. SHIP WT. (LBS.) SIZE A B C E 060B/070B x x B x x /090B/095B x x B x x B x x B x x B x x B x x B x x B x x B x x Notes: C E SQUARE A DIA. CURB SIZE ROOF OPENING (DAMPER SIZE INCHES) 2.00" CURB DAMPER. All dimensions are in inches unless otherwise noted. 2. Dimensions are not to be used for construction. 3. Outside dimensions of dampers are nominal. 4. Self-flashing roof curbs are " larger than canted curbs. BCRD Spun Aluminum Roof Exhausters, Belt Driven Model BCRD belt driven roof exhausters feature spun aluminum construction available in standard and highpressure designs. Standard Models Available in 4 sizes from 070 through 480 Capacities range from 80 to 28,700 CFM, with static pressures to 2.5 inches High-Pressure Models Available in 8 sizes from 00 through 360 Capacities range from 330 to 7,500 CFM, with static pressures to 3.25 inches Dimensional Data and Weights FAN DIMENSIONS CANTED CURB SIZE DAMPER SIZE AVG. SHIP WT. (LBS.) SIZE A B C E 070D/075D x x D x x D/00D x x D x x D x x D x x D/60D x x D/80D x x D/20D x x D/240D x x D/300D x x D/360D x x D x x D x x C E SQUARE A DIA. CURB SIZE ROOF OPENING (DAMPER SIZE INCHES) B 2.00" CURB DAMPER Notes:. All dimensions are in inches unless otherwise noted. 2. Dimensions are not to be used for construction. 3. Outside dimensions of dampers are nominal. 4. Self-flashing roof curbs are " larger than canted curbs. 4 Twin City Bulletin 4050

5 Hurricane Resistant Enclosure Hurricanes are one of the most destructive events created by nature, causing both property damage and injury. Twin City Fan & Blower offers a hurricane enclosure that is Miami-Dade County, Florida approved. The tiered, louvered housing of the Twin City Fan hurricane enclosure is design to be used with the BCRD and BCRD-E roof mounted centrifugal exhausters. Hurricane Certifications Louvered sections conform to all industry standards and have been independently tested in accordance with the latest Florida Building Code and Miami-Dade County Test Protocols: Large Missile Impact Test: TAS-20 Uniform Static Air Pressure Test: TAS (68 psf) Cyclic Wind Pressure Test: TAS-203 Construction Features Louver Frame T5 extruded aluminum 6" deep, 0.25" nominal wall thickness. Louver Blade T5 extruded aluminum 0.08" nominal wall thickness. Drainable, stationary blades provide a means to capture and drain water away, as well as reduce water penetration. Roof " formed aluminum. Boxed Corner Flashing " thick formed aluminum, mechanically fastened to louver frame. Bird Screen - 5/8" x 0.040" (6x) expanded, flattened aluminum screen in removable frame. Sill " thick formed aluminum. Installation Hardware - Tie-down cables and bolts are supplied to connect enclosure to roof. Clip angles and fasteners are supplied to connect to curb. SIZE 070D/075D 085D 00D/00 20D 40D/40 60D/60 80D/80 20D/20 240D/240 ENCLOSURE DIMENSIONS A B C ROOF UNIT x x x A B C 2" ROOF CURB PROVIDED ROOF OPENING SILL ROOF OPENING Notes:. See BCRD and BCRD-E (pages 3 and 4) for fan details. 2. Enclosure must be installed per Twin City Fan IM Roof curb will be provided by Twin City Fan & Blower. 4. Miami-Dade Notice of Acceptance No Florida Product Approval No. FL Developed in conjunction with Ruskin Manufacturing. Twin City Bulletin

6 Construction Features Wheel Quiet and efficient non-overloading wheels with backwardly curved blades are precisely matched to a deep spun venturi. All wheels are statically and dynamically balanced to ensure smooth and quiet operation. Housing BCRD-E housings feature Endurex polymeric construction of the housing and top cover. Twin City Fan & Blower's proprietary Endurex material provides significantly improved impact, weather, corrosion and UV resistance. BCRD housings feature heavy gauge spun aluminum construction of the shroud and top cover. Shrouds feature a rolled bead edge for rigidity. Motor bands are constructed of heavy gauge aluminum, rolled and beaded for rigidity. DCRD housings feature heavy gauge spun aluminum construction of the shroud and top cover. Shrouds feature a rolled bead edge for rigidity. All housings provide complete protection of the motor and drive assembly, while allowing quick access to these components. Curb Cap One-piece curb cap/inlet venturi assembly features welded corners to provide complete protection from weather. Prepunched mounting holes provide easy and accurate attachment to the roof curb. Shaft Precision ground and polished with a first critical speed of at least 25% of the fan s maximum operating speed. Bearings Heavy-duty re-greaseable pillow block ball bearings are specifically designed for air handling applications to provide an average life (L-50) of 500,000 hours or more at maximum cataloged operating speeds. Vibration Isolation Wheel, motor and drive assembly are completely isolated from the fan supports by rubber isolators to reduce transmission of noise and vibration. Motors ODP, TEFC, and explosion proof, single and three phase motors are carefully matched to the fan load. Drive Adjustable pitch V-belt drives with cast iron sheaves and heat resistant belts are selected at 50% of the driven motor horsepower. Balancing Entire fan assembly is balanced and tested at the factory before shipping. Galvanized Bird Screen Protects the wheel, inlet, and internal components from entry of birds. Disconnect Switch Standard on all units. Fans are provided with a NEMA- type disconnect switch mounted in the motor compartment when ODP or TEFC motors are used. When explosion proof motors are specified, a NEMA- 7/9 disconnect switch will be shipped loose for field mounting and wiring. Conduit Tubing A conduit tube is furnished for running electrical wiring through the curb cap and into the motor compartment. Conduit tubes are constructed of Electrical Metallic Tubing (EMT). A conduit embossment and watertight fitting on the curb cap prevents the entrance of water into the ductwork. Nameplate Permanently attached nameplate displays serial number and unit information for future identification. 6 Twin City Bulletin 4050

7 Exploded Parts View DCRD BCRD TOP COVER TOP COVER MOTOR HOUSING BAND COVER CLIPS MOTOR HOUSING BAND SHROUD COVER CLIPS SHROUD MOTOR SUPPORT ASSEMBLY DISCONNECT SWITCH WHEEL CONDUIT MOTOR & BEARING SUPPORT ASSY DISCONNECT SWITCH BIRDSCREEN CURB BASE WHEEL CONDUIT BIRDSCREEN BCRD-E CURB BASE TOP COVER HOUSING Endurex polymeric shroud is one piece construction Twin City Bulletin

8 Accessories Backdraft Damper Backdraft dampers, with automatic or motorized operation, feature a felt seal on the edge of the damper blades for quiet operation. Damper frames are constructed of 20-gauge galvanized steel and blades are constructed of 26-gauge aluminum. Motorized dampers are recommended for low CFM applications to assure unrestricted airflow. Motorized dampers are available with 5, 208, 230, 460 or 575 volt service; 575 volt service requires a step-down transformer. When a motorized damper option is selected a 2" (or greater) high roof curb is required. Curb Hinge The curb hinge arrangement provides easy access to the exhaust fan, backdraft damper and duct for servicing and cleaning. The curb hinge is of the piano type, running the entire length of the fan's curb base. The curb hinge option ships loose and is designed for use with a standard canted curb only (.5" less than fan base). This option cannot be used with self-flashing curbs. Retaining Chain A retaining chain is available in conjunction with the curb hinge arrangement to stabilize the unit and to prevent damage from occurring to the unit while servicing and cleaning. Security Hasp A security hasp is available in conjunction with the curb hinge arrangement to prevent removal of the unit from the unit curb cap and prevent entrance into the building through the roof s ductwork. Prefabricated Roof Curbs Prefabricated roof curbs are available in heavy duty galvanized steel or aluminum construction, in heights of 8", 2", or 8". The standard curb (canted) is provided with a factory installed wood nailer, while the optional self flashing design is provided with a /4" polystyrene gasket. Both the standard curb and the self flashing design are provided with.5" of insulation as standard and feature continuously welded seams for added rigidity and moisture protection. Prefabricated curbs are also available in raised cant, pitched and peak models. Refer to Bulletin 490 for complete details on roof curb options. Aluminum Insect Screen Provides protection from entry of insects into wheel, inlet and interior of building. Variable Speed Control Variable speed control is an optional accessory on all DCRD models. To allow the adjustment of airflow for system balancing. Variable speed controllers are solidstate (Tri-ac) design, and are designed to start the motor on high speed for better startup characteristics. Variable speed controls can be shipped separately, factory installed, or field installed on the unit at a later date. Motor must be ODP 5V, PSC or shaded pole type. NEMA-4 Disconnect Switches A NEMA-4, water and dust tight disconnect is available shipped loose for field mounting and wiring. 2-Speed Switch Two speed switch is available for 2 speed/2 winding motors to control the fan speed (high speed, low speed, off). Available on single phase, and below. Firestat The firestat option is intended to shut down the unit in case of a fire in the building. If the firestat sensing element is exposed to an air temperature over its set point, it will open, de-energizing the motor of the unit. The standard firestat is set to open at 40ºF and must be manually reset. The firestat cut-out point is field adjustable from 00ºF to 70ºF. Firestats are available for 5, 208, 230 and 277 volt, -phase units, either factory or field installed. Special Coatings Powered roof exhausters often require special coatings for protective and decorative purposes. Available coatings include air-dried enamel, air-dried epoxy, and Heresite (air-dried phenolic). Contact your Twin City Fan & Blower representative for more information on available coatings and colors. Minimum 2" high curbs are recommended for use with motorized damper. 8 Twin City Bulletin 4050

9 Performance Data Direct Drive 060B 085B DCRD SIZE MOTOR CFM CFM CFM CFM CFM CFM CFM CFM CFM CFM B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone B / B / B / B / The AMCA Seal for sound ratings does not apply to units with speed control. 2. Performance certified is for installation Type A: Free inlet, Free outlet. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. Sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. 5. Highlighted speeds indicate nominal speeds without speed control. All other speeds are intermediate speeds set with the solid-state speed controller. 6. /8 motor is 3-speed (650 /500 /350 ). 7. Speed control is available for ODP 5/60/ only, wired at either the 650 or the 500 taps. Twin City Bulletin

10 Performance Data Direct Drive 090B 20B DCRD SIZE MOTOR CFM CFM CFM CFM CFM CFM CFM CFM CFM CFM B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone B / B / /5* B /8* /3* /5* B /8* /3* * 3-phase units are supplied with /8 860, /4 60 and 750 motors.. The AMCA Seal for sound ratings does not apply to units with speed control. 2. Performance certified is for installation Type A: Free inlet, Free outlet. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. Sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. 5. Highlighted speeds indicate nominal speeds without speed control. All other speeds are intermediate speeds set with the solid-state speed controller. 6. Speed control is available for ODP 5/60/ only. 0 Twin City Bulletin 4050

11 Performance Data Direct Drive 30B 80B DCRD SIZE MOTOR CFM CFM CFM CFM CFM CFM CFM CFM CFM CFM B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone B Sone / B / / B / / B / /4* B * /4* B * B * 3-phase units are supplied with 860 and 60 motors.. The AMCA Seal for sound ratings does not apply to units with speed control. 2. Performance certified is for installation Type A: Free inlet, Free outlet. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. Sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. 5. Highlighted speeds indicate nominal speeds without speed control. All other speeds are intermediate speeds set with the solid-state speed controller. 6. Speed control is available for ODP 5/60/ only. Twin City Bulletin 4050

12 Performance Data Belt Driven 070D BCRD / BCRD-E Max. Motor Frame = / D BCRD / BCRD-E Max. Motor Frame = / D BCRD / BCRD-E Max. Motor Frame = 48 / Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. 2 Twin City Bulletin 4050

13 Performance Data Belt Driven 00D BCRD / BCRD-E Max. Motor Frame = 56 /4 / D BCRD / BCRD-E Max. Motor Frame = /4 600 / D BCRD / BCRD-E Max. Motor Frame = 56 /4 / Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. Twin City Bulletin

14 Performance Data Belt Driven 40D BCRD / BCRD-E Max. Motor Frame = 43T / / / D BCRD / BCRD-E Max. Motor Frame = /4 750 /3 3/ Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. 4 Twin City Bulletin 4050

15 Performance Data Belt Driven 60D BCRD / BCRD-E /4 /3 3/ Max. Motor Frame = 43T D BCRD / BCRD-E Max. Motor Frame = 43T / / / Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. Twin City Bulletin

16 Performance Data Belt Driven 80D BCRD / BCRD-E Max. Motor Frame = 45T / / / D BCRD / BCRD-E 775 /4 890 /3 3/ Max. Motor Frame = 45T Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. 6 Twin City Bulletin 4050

17 Performance Data Belt Driven 20D BCRD / BCRD-E /4 /3 3/ Max. Motor Frame = 45T D BCRD / BCRD-E 3/ Max. Motor Frame = 82T Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include belt drive losses. 3. Performance ratings do not include the effects of appurtenances in the airstream. 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. Twin City Bulletin

18 Performance Data Belt Driven 240D BCRD / BCRD-E 240D BCRD / BCRD-E Max. Motor Frame = 45T / / / / Max. Motor Frame = 82T Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. 8 Twin City Bulletin 4050

19 Performance Data Belt Driven 300D BCRD 300D BCRD 3/ Max. Motor Frame = 84T / / / Max. Motor Frame = 84T Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. Twin City Bulletin

20 Performance Data Belt Driven 360D BCRD /3 3/ D BCRD Max. Motor Frame = 84T Max. Motor Frame = 23T Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. 20 Twin City Bulletin 4050

21 Performance Data Belt Driven 420D BCRD 3/ Max. Motor Frame = 23T D BCRD 3/ Max. Motor Frame = 23T Performance certified is for Installation Type A: Free inlet, free outlet. 2. Power rating (B) does not include transmission losses. 3. Performance ratings do not include the effects of appurtenances (accessories). 4. The sound ratings shown are loudness values in fan sones at 5 ft. (.5 m) in a hemispherical free field calculated per AMCA Standard Type A: Free inlet fan hemispherical sone levels. Twin City Bulletin

22 Typical Specifications DCRD Roof exhaust fans shall be of the direct drive centrifugal type, Model DCRD, as manufactured by Twin City Fan & Blower, Minneapolis, Minnesota. PERFORMANCE Fans shall be tested in accordance with AMCA 20 and AMCA 300 test codes for air moving devices and shall be guaranteed by the manufacturer to deliver rated published performance levels. Fans shall be licensed to bear the AMCA certified ratings seal for both sound and air. Models shall be CULUS 705 listed. CONSTRUCTION Fans shall be constructed of aluminum for durability and appearance. Fan spinnings shall have a rolled bead edge for rigidity. Units shall have a deep venturi inlet to prevent snow and rain entry into the building. The curb cap shall include prepunched mounting holes for ease of installation. A conduit chase constructed of electrical metallic tubing shall be provided to the motor compartment. The curb base shall provide protection from weather. Fans shall bear a permanently attached nameplate displaying model and serial number of the unit for future identification. MOTOR ASSEMBLY Motor assembly shall be mounted on vibration isolators to eliminate vibration and noise transmission into the ductwork. Motors shall be mounted out of the exhaust airstream. WHEEL Fan wheels shall be of the centrifugal backward inclined type, containing a matching inlet venturi for optimum unit performance. Wheels shall be statically and dynamically balanced. MOTOR Motors shall be heavy-duty ball bearing type, closely matched to the fan load. All single-phase ODP motors shall contain thermal overload protection. All motors shall be UL and /or CSA recognized. Motors for use with speed control shall provide good speed controllability without any objectionable noise. DISCONNECT SWITCH A NEMA disconnect switch shall be supplied with wiring leading from the motor to the junction box (ODP and TEFC motors). ACCESSORIES When specified, accessories such as backdraft damper, roof curb, curb hinge, retaining chain, security hasp, variable speed controller, NEMA-3R, 4 disconnect switch, firestat, aluminum bird screen, aluminum insect screen and special coatings 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 operating speed or maximum 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 roof and wall mounted centrifugal exhaust fans for at least one () year from startup or eighteen (8) months from shipment, whichever occurs first. 22 Twin City Bulletin 4050

23 Typical Specifications BCRD / BCRD-E Roof mounted exhaust fans shall be of the belt driven centrifugal type, Model BCRD (Spun Aluminum Housing) and Model BCRD-E (Endurex Polymeric Housing), as manufactured by Twin City Fan & Blower, Minneapolis, Minnesota. PERFORMANCE Fans shall be tested in accordance with AMCA 20 and AMCA 300 test codes for air moving devices and shall be guaranteed by the manufacturer to deliver rated published performance levels. Fans shall be licensed to bear the AMCA certified ratings seal for both sound and air. Models shall be CULUS 705 listed. CONSTRUCTION BCRD-E housings shall be constructed of Endurex for impact, weather, corrosion and UV resistance. BCRD fans housings shall be constructed of spun aluminum and shall offer finish durability and aesthetic appearance. Fan spinnings shall have a rolled bead edge for rigidity. All units have a deep venturi inlet to prevent snow and rain entry into the building. The curb cap shall include prepunched mounting holes for ease of installation. A conduit chase constructed of electrical metallic tubing shall be provided to the motor compartment. The curb base shall provide protection from weather. Lifting lugs shall be provided inside the motor compartment for ease of handling and installation. Fans shall bear a permanently attached nameplate displaying model and serial number of the unit for future identification. MOTOR AND DRIVE ASSEMBLY Motor and drive assembly shall be mounted on vibration isolators to eliminate vibration and noise transmission into the ductwork. Motors and drives shall be mounted out of the exhaust airstream. WHEEL Fan wheels shall be of the centrifugal backward inclined type, containing a matching inlet venturi for optimum unit performance. Wheels shall be statically and dynamically balanced. SHAFT Fan shafts shall be precision-ground and polished. Shafts shall have a first critical speed of at least 25% of the fan s maximum operating speed. BEARINGS Bearings shall be of the one-piece, pillow block type with relubricable zerk fittings. Bearings shall be designed for air handling service with a minimum L-0 life in excess of 00,000 hours; L ,000 hours at the maximum cataloged operating speed. Bearing mounting plate shall have self-aligning tabs for exact locating and alignment of bearings. DRIVE Drive assembly shall be constructed of heavy-gauge galvanized steel. Drives shall be sized for a minimum of 50% of driven horsepower. Machined, cast iron motor sheaves shall be adjustable for final system balance. MOTOR Motors shall be heavy-duty ball bearing type, closely matched to the fan load. All single-phase ODP motors shall contain thermal overload protection. All motors shall be UL and /or CSA recognized. Motor adjustment shall allow precise belt tensioning for optimum belt life and one-person adjustment and servicing. DISCONNECT SWITCH A NEMA disconnect switch shall be supplied with wiring leading from the motor to the junction box (ODP and TEFC motors). ACCESSORIES When specified, accessories such as backdraft damper, roof curb, curb hinge, retaining chain, security hasp, NEMA-3R, 4 disconnect switch, 2-speed switch, firestat, aluminum bird screen, aluminum insect screen and special coatings 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 operating speed or maximum 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 roof and wall mounted centrifugal exhaust fans for at least one () year from startup or eighteen (8) months from shipment, whichever occurs first. All Endurex housing components shall have a limited lifetime warranty. Twin City Bulletin

24 Unlimited Options... Commercial Fans Centrifugal Fans Utility Sets Inline Centrifugal Fans Plenum Fans Radial Bladed Fans Centrifugal Roof & Wall Exhausters Filtered Supply Fans Gravity Relief Ventilators Ceiling & Cabinet Ventilators Propeller Wall Fans Tubeaxial Fans Vaneaxial Fans Propeller Roof Ventilators Fume Hood/Smoke & Heat Exhaust Fans Mancoolers Fiberglass Fans Industrial Fans Centrifugal Fans Forward Curved & Air Kit Components Inline Centrifugal Fans Plug Fans Radial Bladed Fans Radial Tip & High Efficiency Fans Pressure Blowers Tubeaxial Fans Vaneaxial Fans Custom Design Fans Easy Access Fans Insulated Fans Inlet Boxes - Integral and Detached Inlet Box Dampers Independent Bearing Pedestals Split Housings Bolted Housings Spark Resistant Construction Ultra Fine Balancing Modified Widths and Diameters Variable Frequency Drives API Specifications Special Materials Anti-Rotation Devices Sleeve Oil Bearings Volume Control Dampers Inlet Vane Control with External Mechanisms...One Solution..5MPP/ Trenton Lane North Minneapolis, MN Ph o n e: Fax: w w w.tcf.c o m