CENTRIFUGAL FANS. Single Width, Single Inlet WFS & WBS Series WTC TECH CO., LTD. CENTRIFUGAL FANS Single Width, Single Inlet WFS & WBS Series

WTC TECH CO., LTD. CENTRIFUGAL FANS Single Width, Single Inlet WFS & WBS Series C. October CENTRIFUGAL FANS Single Width, Single Inlet WFS & WBS Series

WTC Centrifugal Fans & AMCA Certification WTC Tech Co.,Ltd. certifies that the WFS and WBS 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 and AMCA publication and comply with the requirements of the AMCA Certified Ratings Program.

COMPANY PROFILE Since 99, WTC Tech Co., Ltd. was established as a joint venture company, between the shareholders from Europe and Thailand to manufacture industrial fans which has been a well recognized product, located at Bangpoo Industrial Estate, Samutprakan. With the technology and knowledge transfer from experienced international engineers, we have been providing high-quality products that response to the customers demand throughout the last 7 years. Over the past decade, we have developed and emphasized on reliable production process, quality control system and continuous development activities. With an emphasis on engineering knowledge as well as new technology, we have developed a lot of experienced and capable Thai engineers having charge of production and quality control to manage the production activities to assure that the customers would acquire the standardized products and to be of assistance for any customers inquiry. With our quality policy, we have adopted & certified for ISO9: and AMCA sealed for Centrifugal Single Inlet Fans that will guarantee our quality commitment to deliver to all the customers. WTC Tech Co., Ltd. as the experienced manufacturer proudly presents, the quality brand of industrial fans. With our high standard production and quality control process, we assure all customers that we will offer only quality products, competitive price, reliable delivery and professional service support for the customer s highest satisfaction.

CONTENTS INTRODUCTION Page GENERAL WHY VENTILATE? Company Profile 4 Introduction General 7 Why ventilate? 7 Fan Engineering 7 Fan s Law 8 s and Construction 9 Conversion Factors Serie WFS Technical Specifications Serie WFS-O Dimensions & Weights 4 Serie WBS Technical Specifications 4 Serie WBS-O Dimensions & Weights 68 All dwellings need a supply of fresh air, not just for the health and comfort of the occupants, but also to control condensation, remove pollutants and to ensure the safe and efficient operation of some combustion appliances. The amount of fresh air should match the needs of the dwelling and the people living within it. To achieve an energy efficient standard of ventilation requires consideration of both the building fabric and the efficiency of the ventilation system. Whether designs for new or existing buildings are under consideration, ventilation should be thought of as part of an integrated design approach for achieving energy efficiency. The thermal insulation, heating systems and controls, and householder advice are some other important aspects to consider during the design process. Ventilation is necessary to provide a healthy and comfortable internal environment for the building s occupants. The main task of ventilation is to remove polluted indoor air from a building and replace it with fresh outside air. Ventilation can also serve other roles for instance, to provide and air supply to open-flued combustion appliances and to form part of an integrated strategy to provide thermal comfort and control summertime over-heating. FAN ENGINEERING Airflow Airflow is most commonly expressed as a Volumetric Flow Rate. It can be considered as an amount of air that is move. Typical units of measurement are: Centrifugal Fans 7

INTRODUCTION m /h (CMH): Cubic metres per hour CFM: cubic feet per minute L/s: litres per second Resistance To Airflow Air needs to be pushed or pulled to move it from one point to another. When moving any object, force is required to overcome the resistance to movement. Moving air requires a force to overcome the resistance through a duct or tube. The resistance to flow is due to the viscosity of air and the friction of each molecule passing over one another. Typical Units of measurement are: mbar: millibar Pa: Pascals InWg: Inches Water Gauge mm.aq.: milimetre Aqueous Fan Performance Fan performance is presented on a graph called a fan curve. Volume flow is on the X axis and pressure is on the Y axis. It shows how much volume of air is moved against resistance to flow, or pressure development of the fan. As you increase the resistance to flow, the volume output of the fan decreases. System Resistance The system be it a tube, black box or a room has a resistance to airflow, along it or though it. This resistance to airflow is expressed as a pressure. The value of this resistance to flow increases with increase in volume. The system resistance curve is a air volume to the power of two. P is proportional to V For example twice the volume is which = four time of pressure. Half the volume.5 =.5 of the pressure. This can be plotted on a fan curve and where the system with that fan fitted. Noise A fan is a good generator of noise! We hear noise by sensing pressure variation on our ear drums. When a fan operates the noise generated from various parts of the fan is transmitted by air molecules bouncing against each other and spreading out as small pressure waves. Sound power and Sound pressure: Sound can be expressed in two ways. Sound power, how many watts of energy is converted into sound, or Sound pressure where the pressure of the sound waves are measured in Pascal s. Decibels (db): Both sound power and sound pressure are expressed in units of measurement called decibels. The measurements are on a logarithmic scale as the ear is sensitive to noise in a logarithmic fashion. A Weighting sound pressure level (dba): Noise figures are commonly expressed as A weighted. This is a method to provide a figure which gives a sound level which is perceived by the human ear. FAN S LAW The most commonly used fan laws in simplified form are:. CFM varies directly with RPM. CFM = RPM CFM RPM. SP varies with the square of the RPM. SP = RPM = CFM SP RPM CFM HP = RPM = CFM HP RPM CFM. HP varies with the cube of the RPM. Which: CFM = Fan Flow rate (F /Min. ) RPM = Speed of (rpm.) SP = Fan Static Pressure (in.wg.) HP = Fan Power In Fan Casing : The fan casings are made of galvanized sheet metal. Predrilled holes are provided for easy to installation located on the side plates to fix mounting frames. The casings are available for single inlet type. Impeller : The impellers forward curved are made of galvanized steel sheet. Backward curve impellers are made of aluminum. All the wheels are statically and dynamically balanced. Inlet cone : Inlet cones matched to the impeller reduce entry losses to minimum. Inlet cones are made of polyamide reinforced with fiberglass. Fan Model Code : MATERIAL AND CONSTRUCTION Centrifugal fan Belt driven WFS - Forward Curved Single Inlet SWSI WBS - Backward Curved Single Inlet SWSI WFS -O Shaft : Fan shafts are steel turned, ground and polished to precise tolerances. All shaft is sized for critical speed of at least 5 percent of maximum operating speed. Motor : Motors are heavy duty type with permanently lubricated bearing Degree of protection is IP55 (Protection against water jets from any direction.) Bearing : Bearings are heavy duty regreasable ball type in a pillow block cast iron housing select for at least, working hours and low noise while working. Overhung Type Wheel diameter (mm.) 5, 5, 8, 5, 55, 45, 5, 56, 6 7,, 9, 8 WTC Tech Co., Ltd. Centrifugal Fans 9

Conversion Factors Length Centimetres x.97 = Inches Fathoms x 6. = Feet Feet x. = Inches Feet x.48 = Meters Inches x.54 = Centimetres Kilometres x.64 = Miles Metres x.8 = Feet Metres x 9.7 = Inches Metres x.94 = Yards Miles x 58. = Feet Miles x.69 = Kilometres Rods x 5.5 = Yards Yards x.944 = Metres Pressure milibar x = Pascal Pascal x 4.x = Inches water Pascal x. = milimetre aqueous Inches water x 5.4 = milimetre gauge aqueous Volume Cubic feet x.8 = Cubic metres Cubic feet x 7.48 = Gallons Cubic inches x.554 = Ounces (fluid) Cubic metres x 5. = Cubic feet Cubic metres x.8 = Cubic yards Cubic yards x.7646 = Cubic metres Gallons x.7 = Cubic feet Gallons x.7 = Liters Force and Weight Kilograms x.5 = Pounds Newtons x.48 = Pounds (force) Ounces x 8.5 = Grams Pounds x 45.6 = Grams Tons (short) x 97. = Kilograms Tons (short) x = Pounds Energy or Work Btu x 778. = Foot-Pounds Btu x 5. = Gram-calories Forward Curved Single Inlet SWSI WFS 5- *Overhung Type Centrifugal Fan Curves are as same as those of the standard Centrifugal Flow rate Cubic metre x.5886 = Cubic feet per hour per minute Cubic metre x 5.5 = Cubic feet per minute per minute liters per second x.89 = Cubic feet per minute Torque Gram-centimetres x.9 = Ounce-inches Newton-metres x.776 = Pound-feet Newton-metres x 8. = Pound-inches Power Btu per hour x.9 = Watts Horsepower x 55. = Foot-pounds per second Horsepower x 746. = Watts Plane angle Degrees x.75 = Radians Minutes x.667 = Degrees Minutes x.9x -4 = Radians Quadrants x 9. = Degrees Quadrants x.578 = Radians * Pounds are U.S. avoirdupois. * Gallons and quarts are U.S. WTC Tech Co., Ltd. Centrifugal Fans

WFS 5 Forward Curved Single Inlet SWSI 5 mm. 5 5 5 4.4 m Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8. (rpm) 9 9 9 - - - - - - - - 7.5 9 - - - - - - - - (rpm) 4 47 9.5 8 47 9 77 9.5.5 64 64 77.5 9 47 9 47 64 4 8 9 47 4-Ø Ø5 Ø59 -Ø8 -Ø 9 8 75 7 65 6 (rpm) 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 5 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. WTC Tech Co., Ltd. Centrifugal Fans

WFS 5 Forward Curved Single Inlet SWSI 5 mm. 4 5.55 m Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - - - - - - -. (rpm) 8.5 4 - - - - - - - - (rpm) 4.5 6 47 47 7 4 9 46 9.5.5 64 64 8 9.5 9 9 7 47 56 6 6 4-Ø Ø5 Ø86 -Ø8 -Ø 9 8 7 6 (rpm) 64 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 5 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 4 WTC Tech Co., Ltd. Centrifugal Fans 5

WFS 8 Forward Curved Single Inlet SWSI 8 mm. 4 5 6 7.644 m 5 5 Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8. (rpm) 7 7 7 7 - - - - - - - 5.5 8 47 5 - - - - - - - (rpm) 4.5 4 9 54 54 5.5 84 7 479 7.5.5 7 75 7 75 4 54.5 7 448 5 54 94 5 8 84 4-Ø Ø8 Ø -Ø -Ø6 9 8 7 6 (rpm) 7 75 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 8 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 6 WTC Tech Co., Ltd. Centrifugal Fans 7

WFS 5 Forward Curved Single Inlet SWSI 5 mm. 4 5 6 7 8.88 m 5 5 5 Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 9 9 9 9 - - - - - - -. 5 (rpm) 7 7.5 4 49 5 - - - - - - - (rpm) 7 4.5 54 47 55 77 54 44 7 54 7 5.5.5 7 75 7 75 45 75 5 65.5 5 7 5 47 54 48 94 49 5 4-Ø Ø5 Ø56 -Ø -Ø6 9 8 7 6 5 (rpm) 7 7 75 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 5 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 8 WTC Tech Co., Ltd. Centrifugal Fans 9

WFS 55 Forward Curved Single Inlet SWSI 55 mm. 4 6 8.5 m 5 5 5 5 Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8. 55 5 (rpm) 45 44 44 44 44 44 - - - - - - 4 5.5 55 64 68 84 - - - - - - (rpm) 45.5 4 6 6 7 466 568 5.5.5 4 4 88 88 7 94 55 7.5 4 55 7 6 488 444 77 4-Ø Ø55 Ø 4-Ø 4-Ø6 9 8 7 6 55 5 (rpm) 45 88 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 55 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. WTC Tech Co., Ltd. Centrifugal Fans

WFS Forward Curved Single Inlet SWSI mm. 4 6 8 4. m 5 5 5 45 5 Inlet Cone: Polyamide FRP (rpm) Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 47 47 47 47 47 - - - - - -. 5 7 9 55.5 58 67 7 87 - - - - - - (rpm) 4 6.5 468 6 55 4 644 4 9.5.5 88 88 99 9 7 4 5.5 4 67 88 6 544 5 59 4-Ø Ø Ø48 4-Ø 4-Ø6 9 8 75 7 65 6 (rpm) 9 7 5 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. WTC Tech Co., Ltd. Centrifugal Fans

WFS 45 Forward Curved Single Inlet SWSI 45 mm. 4 6 8 4 6 8.64 m 5 Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 5 7 9 (rpm) - 66 66 66 66 - - - - - - - 77 86 9 6 - - - - - - 9 (rpm).5 5 765 765 7 594 68 5 7 9.5.5 9 9 9 65 9 65 6 468 5.5 9 678 9 65 765 64 56 7 9 4-Ø Ø45 Ø487 4-Ø 4-Ø6 9 8 75 7 65 (rpm) 9 7 5 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 45 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 4 WTC Tech Co., Ltd. Centrifugal Fans 5

WFS 5 Forward Curved Single Inlet SWSI 5 mm. 6 8 4 6 8.4 m 5 7 Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 5 7 (rpm) 9-78 78 78 78 78 - - - - - - 89 98 8 7 - - - - - 7 (rpm) 9 575 765 765 6.5 6 9 9 65 9 65 77 9 66 96 5 5 45 5 55 65 7 75.5.5 6 765 7 6 4-Ø 4-Ø6 9 764 67 66 Ø5 Ø54 4-Ø 9 8 75 7 5 7 (rpm) 9 9 65 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 5 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 6 WTC Tech Co., Ltd. Centrifugal Fans 7

WFS 56 Forward Curved Single Inlet SWSI 56 mm. 5 5 5.576 m Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - - - - - 5 7 9 (rpm) 9 7 5-4 5 54 7 79 - - - - - 7 (rpm) 9.5 64 947 5 45 5 76 9 55 8 4 6 76 4 458 578 5 45 5 55 65 7 75.5.5 4 45 5 744 7 4 68 4-Ø Ø56 Ø65 4-Ø4 4-Ø 5 9 8 75 7 5 7 (rpm) 9 76 8 4 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 56 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 8 WTC Tech Co., Ltd. Centrifugal Fans 9

WFS 6 Forward Curved Single Inlet SWSI 6 mm. 5 5 5.6 m Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 (rpm) 75 65 55 45 5 - - 4 4 4 4 4 - - - - - - 6 65 8 9 - - - - (rpm) 75 7 9 449 7.5 75 65 76 6 89 76 5 45 5 55.5 7 75 48 5 468 54 64 5.5 6 449 9 8 788 458 44 4-Ø Ø6 Ø674 4-Ø4 4-Ø 5 9 8 75 5 45 55 65 (rpm) 75 76 48 5 7 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 6 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. WTC Tech Co., Ltd. Centrifugal Fans

WFS 7 Forward Curved Single Inlet SWSI 7 mm. 5 5 5 45.49 m Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 (rpm) 7 5 - - - - - - - 5 56 7 8 86 - - - (rpm) 7.5 6 499 7 65 8.5 8 5 5 45 5 55.5 978 8 7 77 57 58 7 5 5.5 7 499 6 7 77 94 89 55 47 4-Ø Ø766 Ø7 8-Ø6 5 9 8 75 7 5 (rpm) 7 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 7 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. WTC Tech Co., Ltd. Centrifugal Fans

WFS Forward Curved Single Inlet SWSI mm. 5 5 5 45 5.59 m Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - 4 4 4 4 4 4 4 - - 5 5 45 55 (rpm) 65 - - 6 67 8 9 97 4 68 - - 9 (rpm) 65.5 98 558 898 76 7 76 4 5 45 5 55.5.5 5 86 9 5 69 78 5 5.5 47 558 98 44 57 59 4-Ø Ø6 Ø 8-Ø6 5 9 8 75 5 5 45 55 (rpm) 65 86 9 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 4 WTC Tech Co., Ltd. Centrifugal Fans 5

WFS 9 Forward Curved Single Inlet SWSI 9 mm. 5 7.669 m 5 5 5 Inlet Cone: Polyamide FRP Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - - 9 9 9 9 9 9 - - (rpm) 5 - - - 4 59 68 7 49 444 - - 7 (rpm) 5.5 5 6 45 7 7 5 4 678 5.5 5 5 658 7 866 5.5 65 6 5 5 74 66 59 4-Ø Ø6 Ø9 8-Ø6 5 9 8 75 7 (rpm) 5 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS 9 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 6 WTC Tech Co., Ltd. Centrifugal Fans 7

WFS Forward Curved Single Inlet SWSI mm. 5 7 9.886 m 5 5 5 Inlet Cone: Polyamide FRP Forward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 5 5 (rpm) 45 - - - 79 79 79 79 79 79 79 - - - - 4 49 48 4 479 54 59-7 (rpm) 45 65 675.5 475 56 84 5 5.5 55 8 74 768 9 5.5 675 65 88 44 7 658 4-Ø Ø56 Ø5 8-Ø6 5 9 8 5 5 (rpm) 45 8 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 4 for dimensions and weight of WFS Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 8 WTC Tech Co., Ltd. Centrifugal Fans 9

DIMENSIONS & WEIGHT Forward Curved Single Inlet SWSI - Overhung Type Model No. A A B B C C ØD ØD n-ød n-ød4 n-ød5 Model No. A A B B C C ØD ØD n-ød n-ød4 n-ød5 WFS 5-O 59 5 6 9 4 5 59 - -8 4- WFS -O 78 7 6 655 48 4-6 4-4- WFS 5-O 65 58 75 45 458 5 86 - -8 4- WFS 45-O 98 9 6 5 686 749 45 487 4-6 4-4- WFS 8-O 69 6 97 457 5 8-6 - 4- WFS 5-O 5 98 9 75 744 87 5 54 4-6 4-4- WFS 5-O 74 67 8 5 498 54 5 56-6 - 4- WFS 56-O 5 7 8 44 86 96 56 65 4-4-4 4- WFS 55-O 8 74 46 9 566 69 55 4-6 4-4- WFS 6-O 5 7 48 44 98 98 6 674 4-4-4 4- Model No. E E F F G H H H I I J Model No. E E F F G H H H I I J WFS 5-O 47 9 8 4 8 7 7 8 8 9 45 WFS -O 59 5 544 559 665 674 468 65 WFS 5-O 6 6 56 8 54 46 45 6 7 497 WFS 45-O 9 7 56 64 9 575 697 75 5 7 WFS 8-O 84 8 5 94 97 469 477 47 5 55 WFS 5-O 6 7 66 67 9 648 786 794 575 6 76 WFS 5-O 5 49 94 48 4 5 5 77 47 55 WFS 56-O 68 4 7 744 4 7 8 89 64 45 8 WFS 55-O 77 444 488 49 5 59 4 7 597 WFS 6-O 44 458 788 8 4 89 75 449 8 MOTOR (kw).7.75.5..7 5.5 7.5 5 8.5 MOTOR (kw).7.75.5..7 5.5 7.5 5 8.5 Model No. WEIGHT (kg) 8.5 4 4 49 54 5 6 8 Model No. WEIGHT (kg) 8.5 4 4 49 54 5 6 8 WFS 5-O.5 4 - - - - - - - - WFS -O 65 7.5 76 89 5 - - - - - - WFS 5-O 8 6.5 9 48 - - - - - - - - WFS 45-O 7-8 9 - - - - - - WFS 8-O 4.5 4 5 56 - - - - - - - WFS 5-O 8-9 8 4 58 67 - - - - - WFS 5-O 8 46.5 49 58 6 - - - - - - - WFS 56-O 57-68 77 8 97 6 - - - - - WFS 55-O 48 56.5 59 68 7 88 - - - - - - WFS 6-O 8 - - 4 9 4 - - - - J I J I I J I J A A B C C B E E n-ød5 ØD ØD n-ød F F G G H H A A A A B C C B I J E E n-ød5 ØD ØD n-ød F F H G G H H A A I J H n-ød4 n-ød4 G A A G A A R7 L L9 L7 R7 R7 L L9 L7 R7 4 WTC Tech Co., Ltd. Centrifugal Fans 4

DIMENSIONS & WEIGHT Forward Curved Single Inlet SWSI - Overhung Type Model No. WFS 7-O WFS -O WFS 9-O WFS -O Model No. WFS 7-O WFS -O A A A A4 B B C C ØD ØD n-ød n-ød4 94 89 7 65 57 45 986 6 7 766 8-6 4-5 75 5 445 84 6 8-6 4-5 96 9 658 5 7 9 6 8-6 4-5 45 8 74 6 88 54 5 56 8-6 4- E E F F G H H H I I J J 47 55 89 94 8 5 7 8 499 6 7 59 57 44 76 4 47 898 558 74 Backward Curved Single Inlet SWSI WBS 8- *Overhung Type Centrifugal Fan Curves are as same as those of the standard Centrifugal WFS 9-O WFS -O 59 66 74 4 678 65 7 6 69 658 7 44 88 56 84 675 7 5 Model No. WFS 7-O WFS -O WFS 9-O WFS -O MOTOR (kw) WEIGHT (kg) 5 9 488 556.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - 5 9 55 64 69 45 - - - - - 4 47 4 44 447 49 58 - - - - - 5 58 57 54 588 6 - - - - - 58 596 65 6 656 68 76 - J I I J A A A B C C B E E n-ød4 ØD ØD n-ød F F G G H H A4 I J G H A4 A R7 L L9 L7 R7 4 WTC Tech Co., Ltd. Centrifugal Fans 4

WBS 8 Backward Curved Single Inlet SWSI 8 mm. 4 5 6.644 m Aluminum 5 5 Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8. 5 5 (rpm) 5 5 5 5 5 - - - - - - -.5 6 45 49 - - - - - - - (rpm) 5 6 9 54 54 5 5 5 84 7 479 7 75 5 5 4 7 75 7 75 4 54 75 5 5 7 448 5 54 7 75 94 5 8 84 4-Ø Ø8 Ø -Ø -Ø6 5 9 8 75 7 5 5 (rpm) 5 4 6 8 4 6 R7 L L9 L7 R7 *Refer to page 68 for dimensions and weight of WBS 8 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 44 WTC Tech Co., Ltd. Centrifugal Fans 45

WBS 5 Backward Curved Single Inlet SWSI 5 mm. 4 5 6 7 8.88 m Aluminum 5 5 5 Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 6 6 6 6 - - - - - - - 4.5 7 46 5 - - - - - - -. 5 75 5 (rpm) 5 75 7 (rpm) 5 6 54 47 77 54 75 5 44 7 54 7 5 5 4 7 75 7 75 45 75 5 5 75 5 7 5 47 54 7 75 48 94 49 5 4-Ø Ø5 Ø56 -Ø -Ø6 5 9 8 75 5 75 5 (rpm) 5 75 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 68 for dimensions and weight of WBS 5 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 46 WTC Tech Co., Ltd. Centrifugal Fans 47

WBS 55 Backward Curved Single Inlet SWSI 55 mm. 4 6 8.5 m Aluminum 5 5 5 5 Inlet Cone: Polyamide FRP (rpm) Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 4 4 4 4 4 - - - - - -. 5 5 5.5 5 6 66 8 - - - - - - (rpm) 7 6 7 75 6 4 6 466 568 5 5 5 4 4 88 88 4 7 94 75 5 5 7 6 77 4-Ø 4-Ø6 4 55 488 444 Ø55 Ø 4-Ø 5 9 8 75 5 (rpm) 5 88 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 68 for dimensions and weight of WBS 55 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 48 WTC Tech Co., Ltd. Centrifugal Fans 49

WBS Backward Curved Single Inlet SWSI mm. 4 6 8 4. m Aluminum 5 Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 5 75 (rpm) 75 5 44 44 44 44 44 - - - - - - 5.5 55 64 68 84 - - - - - - (rpm) 75 8 6 5 7 468 6 5 6 55 4 644 4 75 5 5 4 88 88 99 9 4 5 5 5 4 67 88 6 544 5 59 4-Ø Ø Ø48 4-Ø 4-Ø6 5 9 8 75 5 75 (rpm) 75 5 4 6 8 4 6 8 R7 L L9 L7 R7 *Refer to page 68 for dimensions and weight of WBS Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 5 WTC Tech Co., Ltd. Centrifugal Fans 5

WBS 45 Backward Curved Single Inlet SWSI 45 mm. 4 6 8 4 6 8.64 m Aluminum 5 Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8-6 6 6 6 6 - - - - - 5 (rpm) - 7 8 - - - - - (rpm) 765 8 5 765 594 9 68 9 5 6 4 9 65 9 65 6 468 5 9 678 765 64 56 7 9 4-Ø Ø45 Ø487 4-Ø 4-Ø6 5 9 8 (rpm) 9 65 5 5 R7 L L9 L7 R7 *Refer to page 69 for dimensions and weight of WBS 45 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 5 WTC Tech Co., Ltd. Centrifugal Fans 5

WBS 5 Backward Curved Single Inlet SWSI 5 mm. 5 5 5.4 m Inlet Cone: Aluminum Polyamide FRP 5 7 9 Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 (rpm) - 7 7 7 7 7 7 - - - - - 84 9 97 7 - - - - (rpm) 8 765 6 7 575 765 5 6 6 9 77 9 5 4 9 65 9 65 66 96 5 5 9 764 6 9 65 765 67 66 7 6 4-Ø Ø5 Ø54 4-Ø 4-Ø6 5 5 9 8 75 (rpm) 5 5 R7 L L9 L7 R7 *Refer to page 69 for dimensions and weight of WBS 5 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 54 WTC Tech Co., Ltd. Centrifugal Fans 55

WBS 56 Backward Curved Single Inlet SWSI 56 mm. 5 5 5 5.576 m Aluminum Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - - - - 4 46 6 7 76 - - - 5 9 (rpm) 7 (rpm) 64 947 5 45 9 8 76 9 6 76 5 7 5 6 4 55 8 4 4 458 578 5 9 4 76 45 5 8 4 R7 744 7 4 68 4-Ø Ø56 Ø65 4-Ø4 4-Ø L L9 L7 R7 *Refer to page 69 for dimensions and weight of WBS 56 Overhung Type. 5 5 9 9 7 (rpm) 5 5 5 ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 56 WTC Tech Co., Ltd. Centrifugal Fans 57

WBS 6 Backward Curved Single Inlet SWSI 6 mm. 5 5 5 5.6 m Aluminum Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - 4 4 4 4 4 4 - - - (rpm) - - 54 58 74 8 88 4 - - - (rpm) 9 7 8 75 9 449 7 76 6 7 75 48 5 89 76 468 54 64 5 5 5 9 6 5 4 7 6 76 449 9 48 5 8 788 458 44 4-Ø Ø6 Ø674 4-Ø4 4-Ø 5 5 9 8 75 (rpm) 5 5 R7 L L9 L7 R7 *Refer to page 69 for dimensions and weight of WBS 6 Overhung Type. ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 58 WTC Tech Co., Ltd. Centrifugal Fans 59

WBS 7 Backward Curved Single Inlet SWSI 7 mm. 5 5 5 5 45.49 m Aluminum Inlet Cone: Polyamide FRP Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - - - - - 5 56 7 8 86 57 - - (rpm) (rpm) 7 6 499 6 8 5 8 5 9 4 978 8 7 77 57 58 7 7 7 499 6 94 89 55 47 4-Ø Ø766 Ø7 8-Ø6 5 9 (rpm) 7 77 R7 L L9 L7 R7 *Refer to page 7 for dimensions and weight of WBS 7 Overhung Type. 4 6 8 4 6 8 ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 6 WTC Tech Co., Ltd. Centrifugal Fans 6

WBS Backward Curved Single Inlet SWSI mm. 5.59 m Aluminum Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 (rpm) - - 45 45 45 45 45 45 45 - - - - 65 69 94 99 45 7 - - (rpm) 6 98 558 898 76 5 76 4 9 4 5 86 9 5 69 78 7 5 47 558 98 86 9 R7 44 57 59 4-Ø Ø6 Ø 8-Ø6 L L9 L7 R7 *Refer to page 7 for dimensions and weight of WBS Overhung Type. 5 9 8 (rpm) 4 6 8 4 6 8 ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 6 WTC Tech Co., Ltd. Centrifugal Fans 6

WBS 9 Backward Curved Single Inlet SWSI 9 mm. 5 7.669 m Aluminum 5 5 5 Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - - 6 6 6 6 6 6 6 - (rpm) - - - 6 76 9 46 46 496 - (rpm) 8 7 5 6 7 7 5 6 4 678 9 5 4 5 5 658 7 866 5 7 5 65 6 5 5 R7 74 66 59 4-Ø Ø6 Ø9 8-Ø6 L L9 L7 R7 *Refer to page 7 for dimensions and weight of WBS 9 Overhung Type. 5 5 9 8 75 (rpm) 5 5 ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 64 WTC Tech Co., Ltd. Centrifugal Fans 65

WBS Backward Curved Single Inlet SWSI mm. 5 7 9.886 m Aluminum 5 5 5 Inlet Cone: Polyamide FRP Backward.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - - 89 89 89 89 89 89 89 89 (rpm) - - - 4 49 48 44 489 54 549 569 (rpm) 7 475 65 675 9 6 56 84 7 5 4 55 8 74 768 9 5 675 65 8 R7 88 44 7 658 4-Ø Ø56 Ø5 8-Ø6 L L9 L7 R7 *Refer to page 7 for dimensions and weight of WBS Overhung Type. 5 5 9 8 (rpm) 4 6 8 4 6 8 ) Power rating (B.kW) does not include transmission loss. ) Performance ratings do not include the effects of appurtenances (accessories). ) Performance certified is for installation type B - Free inlet, Ducted outlet. 4) The sound power level ratings shown are in decibels, referred to - watts, calculated per AMCA International Standard. 66 WTC Tech Co., Ltd. Centrifugal Fans 67

DIMENSIONS & WEIGHT Backward Curved Single Inlet SWSI - Overhung Type Model No. A A B B C C ØD ØD n-ød n-ød4 n-ød5 Model No. A A B B C C ØD ØD n-ød n-ød4 n-ød5 WBS 8-O 69 6 97 457 5 8-6 - 4- WBS 45-O 98 9 6 5 686 749 45 487 4-6 4-4- WBS 5-O 74 67 8 5 498 54 5 56-6 - 4- WBS 5-O 5 98 9 75 744 87 5 54 4-6 4-4- WBS 55-O 8 74 46 9 566 69 55 4-6 4-4- WBS 56-O 5 7 8 44 86 96 56 65 4-4-4 4- WBS -O 78 7 6 655 48 4-6 4-4- WBS 6-O 5 7 48 44 98 98 6 674 4-4-4 4- Model No. E E F F G H H H I I J Model No. E E F F G H H H I I J WBS 8-O 84 8 5 94 97 469 477 47 5 55 WBS 45-O 9 7 56 64 9 575 697 75 5 7 WBS 5-O 5 49 94 48 4 5 5 77 47 55 WBS 5-O 6 7 66 67 9 648 786 794 575 6 76 WBS 55-O 77 444 488 49 5 59 4 7 597 WBS 56-O 68 4 7 744 4 7 8 89 64 45 8 WBS -O 59 5 544 559 665 674 468 65 WBS 6-O 44 458 788 8 4 89 75 449 8 MOTOR (kw).7.75.5..7 5.5 7.5 5 8.5 MOTOR (kw).7.75.5..7 5.5 7.5 5 8.5 Model No. WEIGHT (kg) 8.5 4 4 49 54 5 6 8 Model No. WEIGHT (kg) 8.5 4 4 49 54 5 6 8 WBS 8-O.5 4 4 47 - - - - - - - WBS 45-O 6-7 8 - - - - - WBS 5-O 9.5 4 5 55 - - - - - - - WBS 5-O 9-4 49 5 69 78 - - - - - WBS 55-O 5 4.5 46 55 59 75 - - - - - - WBS 56-O 7-8 9 96 6 - - - - WBS -O 48 56.5 59 68 7 88 - - - - - - WBS 6-O 96 - - 6 6 45 5 - - - - J I J I I J I J A A B C C B E E n-ød5 ØD ØD n-ød F F G G H H A A A A B C C B I J E E n-ød5 ØD ØD n-ød F F H G G H H A A I J H n-ød4 n-ød4 G A A G A A R7 L L9 L7 R7 R7 L L9 L7 R7 68 WTC Tech Co., Ltd. Centrifugal Fans 69

DIMENSIONS & WEIGHT Backward Curved Single Inlet SWSI - Overhung Type Model No. WBS 7-O WBS -O WBS 9-O WBS -O Model No. WBS 7-O WBS -O WBS 9-O WBS -O A A A A4 B B C C ØD ØD n-ød n-ød4 94 89 7 65 57 45 986 6 7 766 8-6 4-5 75 5 445 84 6 8-6 4-5 96 9 658 5 7 9 6 8-6 4-5 45 8 74 6 88 54 5 56 8-6 4- E E F F G H H H I I J J 47 55 89 94 8 5 7 8 499 6 7 59 57 44 76 4 47 898 558 74 59 66 74 4 678 65 7 6 69 658 7 44 88 56 84 675 7 5 Model No. WBS 7-O WBS -O WBS 9-O WBS -O MOTOR (kw) WEIGHT (kg) 7 96 5 6.7.75.5..7 5.5 7.5 5 8.5 8.5 4 4 49 54 5 6 8 - - 47 5 67 76 8 47 45 - - - - 46 4 46 445 45 496 5 - - - - - 544 56 569 574 6 645 68 - - - - 64 65 659 664 7 75 77 79 J I I J A A A B C C B E E n-ød4 ØD ØD n-ød F F G G H H A4 I J H G A4 A R7 L L9 L7 R7 7 WTC Tech Co., Ltd.