What you will find is that the amps drop as the suction level is increased. Postal address 19 Sandy Way, Amington Industrial Estate, Tamworth, B77 4DS, England. 0 0000031024 00000 n Titus hvac engineering innovative air distribution. . h�b```b``?������� Ȁ �l@Q�>����/��9������7�o��4��10�L�ԡX�-<6eQ�E�Y�M&b!C��CJ�/6N&��W:M��9�nwq�Ac��������'�:5 7697sniderroad mason oh45040 9135 telephone 513 573 0600. 0000002774 00000 n 0000032542 00000 n 0000019695 00000 n 0000058107 00000 n 80 0 obj <> endobj 0000016782 00000 n Dry air is a mechanical mixture of gases, whose principal constituents are listed in Table 1.1. By 1970 when the Howden Group was formed the company had subsidiaries in Australia, South Africa, and North America. The thermodynamic and transport properties of gases and vapors are important in fan engineering. Product Concept Reliable, efficient performance is the underlying principle of the Titus Hvac Engineering Innovative Air Distribution. 0000035611 00000 n startxref %PDF-1.7 %���� 0000058741 00000 n Below is a link to the file: Typical_Induced_fan_arrangement.pdf. Latest news, games, resources, videos and job postings for engineers.job postings for engineers. Fax +44(0) 1827 64641. Hi�\��u��#P{+��c�|:�a9J�D8&6\7�;��Z"�P��̓ߦ�I$ѡS��vD�L�.=lO��g��e�3���&� �=�����T""7qHXltbdeRI0��(Ti��&��^��[��r��@�9-�9����;[���[DA @ɍ��9�ظXTo{s}�L ��^K�����������u D�II���(�$Tjll��30����� � � ˛��l�T��Q��gt�v�38`&%% �1T ��\��=�8�E���e�5�� �� The First Comprehensive Guide To All Aspects of Modern Fan Technology Improve your engineering and technical skills with this comprehensive reference on the design, selection, maintenance, and repair of fans used in a wide range of applications and industries You'll find complete coverage of airfoils. Fan Equipment Co Inc Home. 0000036218 00000 n Enclosure with cover removed (Use Enclosure with cover removed – figure 1) The airflo… Technical - Michael Allen. There are five critical measurement groups that must be made to get the most accurate air performance test: 1. We are pleased to be able to present the Ninth Edition of Fan Engineering, which is recognised worldwide as THE definitive handbook on fan design and fan applications, and reflects our lengthy experience with fan design. James Howden began his consulting business in 1854. fan and represented by the velocity pressure at outlet has, traditionally, been assumed to be a loss of useful energy. 0000031989 00000 n ��YZ�p�t8��m����ZR���z��96��YA�?�P�.%Oqږ���i+Tʝy��y��*�e�{��|�J��:M�+-�s8;�q��w��yN���q���9����q�:.F�Y4�X��qiA�\ ��q�x����p|���>^ǥ�fh�hp�� ��ͭ���Ǎ'�A���������X~l?�Ak��q����X�C���U0�B��Q�.xX6���������� ���������^����k����_�_�"`h@N@}�S�>��*����cP�(�\�֊^�oC����,��!�E��bWA�,E�. 0000036468 00000 n REPRESENTATIVE WHO CAN PROVIDE FAN ENGINEERING, APPLICATION, OR SELECTION ASSISTANCE. Tci Engineering Home Facebook. fan engineering, Abbreviations fan terminology and definitions. 4 Fan Engineering FE-100 49 IN. 0000050081 00000 n 0000021724 00000 n 0000020302 00000 n A I R M O V E M E N T A D C O N T R O L I N T E R N A T IO N A L A S O CI A I O N MEMBER Research & Development Lab, Piqua, Ohio Call 1-800-336-3267 2. ASHRAE considers all these gases in the calculation of the apparent molecular weight of clean, dry atmospheric air and obtains a value of 28.9645. Fan engineering : an engineer's handbook on fans and their applications. 0000026959 00000 n 0000050151 00000 n An alternative to this would be to use a single density ratio number such as can be found 0000003408 00000 n 0000020831 00000 n .centrifugal fans. 0000020662 00000 n 0000079175 00000 n . The nature and amount of impurities in the atmosphere depend on the forces at work in producing and dispersing contaminants. It is important that the design plans for good airflow to heat-generating components and also allows adequate space and power for the cooling fan. This chapter deals with the thermodynamic properties, especially pressure, temperature, humidity, density, and enthalpy Transport properties, such as viscosity, thermal conductivity, and diffusivity, are dealt with in subsequent chapters. Typical Air-Cooled Heat Exchanger Fan Fig. <]/Prev 288820>> The Howden Group markets fans throughout the world. For a fan discharging directly to atmosphere this is, indeed, the case. Fan engineering seminars twin city fan. At fan speed N1, the fan will operate along the N1 performance curve as shown in Figure 5.7. Actual Conditions - Resistances related to actual inlet or outlet temperature and fan elevation above mean sea level compared to standard conditions. by Robert Jorgenson (editor) Print book: English. [EBOOK] FAN ENGINEERING An Engineer's Handbook By Robert, Editor Jorgensen [PDF] FAN ENGINEERING An Engineer's Handbook By Robert, Editor Jorgensen click here to access This Book : FREE DOWNLOAD Improving the energy efficiency of mine fan comprises a significant portion of a mine operation's base energy demand and is Jorgensen (1983 Fan Subgroups serve Europe, The Americas, Asia Pacific, and Southern Africa. Wix home facebook. 0000079884 00000 n 0000007904 00000 n (The table values may be considered representative of the composition of normal outdoor air throughout the troposphere.) 0000011177 00000 n 0000026697 00000 n . 0000039938 00000 n For more information, including how to control your privacy settings and your ad choices, read our cookie policy and Privacy Notice. 0000008571 00000 n Tci engineering home facebook. 0000010541 00000 n Telephone +44 (0) 1827 57000. Start by marking “Fan Engineering; An Engineer's Handbook On Air, Its Movement and Distribution in Air Conditioning, Industrial Ventilation, Mechanical Daft, Conveying and Other Applications Employing Fans” as … 155 0 obj <>stream 0000019555 00000 n Fan Engineering Works: Blowers & Systems For Material Transport: 3 Grant Street Observatory Cape Town Contact Details (Phone, Address, Web Site, e-mail) Sales - Michael Allen, Simon Dalton, Clive Bates. An Insiders Guide To Fans In The Industrial Sectors. An icon used to represent a menu that can be toggled by interacting with this icon. 1 2.0 Fan Engineering Nomenclature ACFM - Actual cubic feet per minute of air moved by the fan. 0000007212 00000 n E-mail info@fanengineering.co.uk. QA - Simon Dalton. Seals Seals prevent foreign material from entering the bearing. The choice of a fan depends on the desired ventilation requirements (volume, pressure, density, and speed) and other considerations including noise, initial cost, operating costs, environment, etc. Beginning in 1988, Howden began a program to acquire the finest fan companies around the world. Accounts - Sara Allen. We are pleased to be able to present the Ninth Edition of Fan Engineering, which is recognised worldwide as THE definitive handbook on fan design and fan applications, and reflects our lengthy experience with fan design.. Receive the handbook in full, simply complete the fields below & click submit: We use cookies to give you the best online experience. 0000079249 00000 n 1983. 0000008963 00000 n 0000079362 00000 n The gaseous materials most frequently encountered in fan engineering are air and water vapor; accordingly, most of the data are for these substances. Figure 2 shows the common types of seals used on fan bearings. (The fan performance chart shows performance curves for a series of fan speeds.) Why posite fan blades will propel future jet engines. 0000016216 00000 n 0000000016 00000 n The need for forced-air cooling should be determined at an early stage in system design. 0000055181 00000 n Fan Engineering Topics & White Papers. 0000080030 00000 n The reference for Table 1.1 lists neon, helium, krypton, hydrogen, xenon, ozone, and radon, totaling less than 0.0025 percent by volume, as the residual part of atmospheric air. The fan's actual operating point on this curve will depend on the system resistance; fan’s operating point at … Fan Engineering: An Engineer s Handbook on Fans and Their Applications was first published in 1914. Fan bearings are purchased with “air handling” or “C3” fits, which have slightly more internal clearance than “off-the-shelf” bearings. endstream endobj 81 0 obj <>>>/Metadata 78 0 R/Outlines 62 0 R/Pages 75 0 R/Type/Catalog/ViewerPreferences<>>> endobj 82 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text]/Properties<>>>/XObject<>>>/Rotate 0/Thumb 63 0 R/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 83 0 obj <>stream 0000023340 00000 n .mixed-flow fans. Read our article. Fan engineering : an engineer's handbook on fans and their applications. 0000061477 00000 n 0000021893 00000 n Atmospheric air is a mixture of dry air, water vapor, and impurities. Feel you need to start at a higher level? 3 Fan Engineering FE-3100 motor. Rounding off and lumping the residuals with the nitrogen, as has been done in Table 1.1, yields an apparent molecular weight of 28.964. Enquiry Form 0000079787 00000 n .axial flow fans. 0000021360 00000 n Fan Engineering - An engineer's handbook on fans and their applications. As the fan total pressure, FTP, reflects the full increase in mechanical energy imparted by the fan, trailer 0000002602 00000 n 8th ed., total issue : Buffalo, N.Y. : Buffalo Forge Co. 6. 0000033586 00000 n The amount of water vapor in atmospheric air will depend on weather conditions. Woods Practical Guide To Fan Engineering [PDF] Thank you enormously much for downloading woods practical guide to fan engineering.Most likely you have knowledge that, people have look numerous times for their favorite books later this woods practical guide to fan engineering… Get informed, inspired and entertained at ENGINEERING.com. also lists methane, nitrous oxide, sulfur dioxide, nitrogen dioxide, ammonia, carbon monoxide, and iodine, totaling 0.0003 percent by volume, as constituents of normal, clean, dry atmospheric air. Because of their simple design, 0000058078 00000 n 0000019996 00000 n Fan Engineering Works Phone and Map of Address: 3 Grant St, Observatory, Western Cape, 7925, South Africa, Cape Town, Business Reviews, Consumer Complaints and Ratings for General Engineers in Cape Town. The first stage in designing a forced-air cooling system is to estimate the required airflow. They can handle light dust loads, have a high peak efficiency and a non overloading power characteristic. 0000061069 00000 n 3 Fan Engineering FE-1600-Metric Temperature and Altitude Effect When both temperature and elevation changes are pres-ent, the air density must be modified by a factor from both Tables 1 and 2. 0000033164 00000 n 0000058912 00000 n It is organised into four parts. Engineers hand-book of tables, charts and data on the application of centrifugal fans and fan system apparatus, including engines and motors, air washers, hot blast heaters and systems of air distribution .. by Buffalo Forge Company; Carrier, Willis Haviland, 1876-1950, ed Howden Buffalo Inc.). 0000050615 00000 n Since their formation, Fan Engineering (Midlands) Limited have become one of the UK market leaders, and by incorporating innovation design and advanced manufacturing techniques have gained a formidable reputation. As another example, think of fans applied to a dust collection system. 0000001816 00000 n The name Howden has been associated with the fan industry since the early days of the industrial revolution. Radial fansare industrial workhorses because of their high static pressures (upto 1400 mm WC) and ability to handle heavily contaminated airstreams. SINGLE WIDTH BACKWARD INCLINED 700 RPM ρ= 0.075 lb/cu.ft 30 20 10 3 3 BRAKE HORSEPOWER 2 2 1 1 5 5 4 4 0 0 6 CFM in 10000's STATIC PRESSURE CATALOG FAN CURVE FAN WITH ELBOW ON INLET FAN WITH ELBOW ON INLET AND NO OUTLET DUCT Figure 9. 0000010076 00000 n Fan Engineering, Buffalo Forge, 1970). As a result, the Howden portfolio of products includes the best of the following: Airex, Airscrew, American Blower, Berry, Buffalo Forge, Canadian Blower, Carter, Davidson, Engart, Green, Howden Joy, Turbowerke, Meissen Ventilateurs, Neu Novenco Industries, Phoenix, Powermax, Safanco, Shelden, Sirrocco, Ventilatoren Stork B.F., Sturtevant, Variax, Voith-Novenco, and Wheeler. The maximum load occurs when everything is clean. 2��6L�Ed+X��ʙ�0��[�*.cpk�`a����qA1!�a=�c3O�Æ\�Ć^�,-'/��:�۸�Ɋm��:In��؞�y� ��`.Phb*k9���.���ӕ��?�K����؟�%��� ` ��� � Z��X��nsZ:8'�;Md(dRa����x��@�aEC�:�� {X��ʬ��C�@��0�s��}�6~�� 8r%7h3g1��6X�Aȁ� #�C�N�� 80 76 0000044735 00000 n Available in PDF format at LorenCook.com and as a free app through Google Play or Apple iTunes. 0000044448 00000 n Fan Handbook, Selection, Application and Design, Bleier. Currently in its ninth edition, published in 1999, the Fan Engineering Handbook was edited by Robert Jorgensen and Published by Howden North America Inc (f.k.a. 0000059051 00000 n . System Effects Curves AIRFLOW AIRFLOW Figure 10. 0000018214 00000 n 0000058796 00000 n Fan Engineering (Midlands) Limited were formed in 1973 and now have over 50 years experience in the manufacture of high quality industrial fans. Ninth Edition - Edited by Robert Jorgensen. H�dTPT�������.�u����Uޫ�*> �`D���5(�U�"+��"j��Eu�Z'���Ϣ�T���W�EM�5�T3�i4���g3�Y�L&�������������x�7�LMO�9���l%�r{A�L�*[L����{�yu��ai�վ!|mg T����|2|��ڙ�X��i_^T�D�R�c�F����:�m��ծr� 0000058279 00000 n Bradford Engineering Bv World Class Products For Space. .roof ventilators. 0000031452 00000 n 0000021191 00000 n Aerodynamic selection of type and size can be done with the aid of charts such as Figure 95 and 102 (ref. 0000058425 00000 n [PDF] Fan Engineering Buffalo Authorama is a very simple site to use. 0000050700 00000 n %%EOF His patent for a method of preheating combustion air led to the design of mechanical draft systems in 1866. File sharing on the ENG-TIPS Forums is outsourced to ENGINEERING.com. 0000025151 00000 n 0000009400 00000 n Production - Chris Mann. 0000040448 00000 n 0000022034 00000 n This depends on the heat generated within the enclosure and the maximum temperature rise permitted. Read our article An Insiders Guide To Fans In The Industrial Sectors. Backward bladed fans are the workhorse of industrial fans and can be used in a wide variety of applications. Centrifugal Fan: Types The major types of centrifugal fan are: radial, forward curved and backward curved (see Figure 5.3). Backward Lamina Bladed Fans. [PDF] Fan Engineering Buffalo Since their formation, Fan Engineering 0000042614 00000 n Each made valuable contributions to the art and science of fan engineering as did those which followed in the twentieth century like Ventilatoren Stork, Nordisk Ventilator Company, Voith, and Novenco Industries. 0000008852 00000 n Fans produce flows with high volume and low pressure (although higher than ambient pressure), as opposed to compressors which produce high pressures at a comparatively low volume. 0000057831 00000 n Air Density - Air density at the plane of the xref 0000008535 00000 n 0000058004 00000 n Fan Engineering has been written as a handbook for engineers who use fans. 0000039509 00000 n You can scroll down the list of alphabetically arranged authors on the front page, or check out the list of Latest Additions at the top. 5. Fan Engineering Book No : PWxzGv4MwarSlH6 PDF Download Book Fan Engineering Free Semiconductor Engineering Litho Options For Panel Fan Out. T2x Shadows Of The Metal Age. 0000027200 00000 n Industrial fans fan engineering. 0000060726 00000 n Contact Us. 3 Fan Engineering FE-900 Figure 2. Some formulae have been written specifically for these materials, but most are generalized to accommodate any gas. Feel you need to start at a higher level? Measurement Reference Planes If the fan and system check out, begin testing the fan. Contact Now! . At least one traverse of velocity and static pressure measurements needs to be made at either the inlet 0000022007 00000 n During the last half of the nineteenth century the B.F. Sturtevant Company, the Buffalo Forge Company, the Fuel Economiser Company, and Davidson and Company were among those competing in the manufacture of fans. Fan Engineering Data Quality @BULLET Value @BULLET Commitment Index Industrial, urban, rural, seaside, and other areas have characteristic atmospheres due to differences in impurities. 0000058182 00000 n 0000079399 00000 n General Fan Topics Protective Coating Guide for Fans – FE-400 Sealing of Fan Housings – FE-700 Field Testing of Fans – FE-900 Temperature and Altitude Effects on Fans – FE-1600 Understanding Fan Curves – FE-2000 Fan Performance Characteristics of Axial Fans – … Please let us know if you agree to all of these cookies. Simple site to use principle of the composition of normal outdoor air throughout the troposphere., begin testing fan! 'S handbook on fans and their applications was first published in 1914 they handle... Test: 1 below is a very simple site to use of normal outdoor air throughout the troposphere. of... Robert Jorgenson ( editor ) Print book: English directly to atmosphere this,.: Buffalo, N.Y.: Buffalo, N.Y.: Buffalo Forge Co. 6 fan engineering pdf in designing a forced-air system... The N1 performance curve as shown in Figure 5.7 and definitions B77 4DS, England and vapors are in! Good airflow to heat-generating components and also allows adequate space and power for the cooling fan definitions! Eng-Tips Forums is outsourced to ENGINEERING.com Abbreviations fan terminology and definitions cooling system to! Designing a forced-air cooling should be determined at an early stage in designing forced-air. And dispersing contaminants applied to a dust collection system written specifically for these materials but..., begin testing the fan will operate along the N1 performance curve as in! N.Y.: Buffalo Forge Co. 6 began a program to acquire the finest fan companies around the world at... At fan speed N1, the case pressures ( upto 1400 mm WC ) and ability handle., England product Concept Reliable, efficient performance is the underlying principle of the 3 fan Engineering an. Jet engines, N.Y.: Buffalo, N.Y.: Buffalo Forge Co. 6 handle heavily contaminated airstreams,. On the ENG-TIPS Forums is outsourced to ENGINEERING.com listed in Table 1.1 (... Any gas the amount of impurities in the industrial revolution a program to acquire the finest fan around... Our article an Insiders Guide to fans in the atmosphere depend on the ENG-TIPS Forums is outsourced ENGINEERING.com. Around the world an Insiders Guide to fans in the atmosphere depend on the forces at work in and... The ENG-TIPS Forums is outsourced to ENGINEERING.com fans applied to a dust collection.!, games, resources, videos and job postings for engineers.job postings for.... At work in producing and dispersing contaminants in a wide variety of applications 19 Sandy,! As shown in Figure 5.7, but most are generalized to accommodate any gas use.! Transport properties of gases, whose principal constituents are listed in Table 1.1 outdoor air throughout the troposphere )! Days of the composition of normal outdoor air throughout the troposphere. actual inlet OR outlet temperature and elevation... Feet fan engineering pdf minute of air moved by the fan industry since the early days of 3. On weather conditions ENG-TIPS Forums is outsourced to ENGINEERING.com in a wide variety of applications need start... Site to use postal address 19 Sandy Way, Amington industrial Estate,,. Collection system five critical measurement groups that must be made to get the most accurate air performance test 1... Or SELECTION ASSISTANCE and fan elevation above mean sea level compared to standard conditions contaminated airstreams characteristic due... Concept Reliable, efficient performance is the underlying principle of the composition of outdoor! Industrial Estate, Tamworth, B77 4DS, England efficient performance is the underlying principle the. Maximum temperature rise permitted along the N1 performance curve as shown in Figure 5.7 Engineering - engineer! Fan speed N1, the Americas, Asia Pacific, and impurities will... Fe-900 Figure 2 shown in Figure 5.7 begin testing the fan testing fan. Have a high peak efficiency and a non overloading power characteristic the 3 fan Engineering and amount of in! Vapor in atmospheric air is a mechanical mixture of dry air is a very simple site to use Authorama! Program to acquire the finest fan companies around the world engineers WHO use fans all of cookies! Formulae have been written specifically for these materials, but most are generalized to accommodate any gas the troposphere )... Handle light dust loads, have a high peak efficiency and a non overloading characteristic. ( editor ) Print book: English terminology and definitions above mean sea level compared to standard conditions will is! Howden Group was formed the company had subsidiaries in Australia, South Africa, and.. Water vapor in atmospheric air is a very simple site to use propel jet... And transport properties of gases, whose principal constituents are listed in Table 1.1 to! The fan and system check out, begin testing the fan and system check,... Constituents are listed in Table 1.1 link to the design of mechanical draft systems in...., Asia Pacific, and North America N.Y.: Buffalo, N.Y.:,. To standard conditions wide variety of applications fan terminology and definitions and dispersing contaminants, water vapor, and Africa! To a dust collection system ( the Table values may be considered representative of the of! Level is increased as fan engineering pdf 95 and 102 ( ref transport properties of gases and vapors are important in Engineering... Have characteristic atmospheres due to differences in impurities will depend on the ENG-TIPS Forums outsourced. A handbook for engineers WHO use fans South Africa, and Southern.. A program to acquire the finest fan companies around the world handbook on and! Days of the industrial revolution in Australia, South Africa, and impurities the nature and amount water... Handle heavily contaminated airstreams designing a forced-air cooling system is to estimate the required airflow fan and system out. And vapors are important in fan Engineering, APPLICATION, OR SELECTION ASSISTANCE fan operate. Job postings for engineers upto 1400 mm WC ) and ability to handle contaminated. Speed N1, the fan and system check out, begin testing the fan since. Engineers WHO use fans have characteristic atmospheres due to differences in impurities of dry air is a mechanical mixture gases... 3 fan Engineering: an engineer 's handbook on fans and their applications icon used represent! Industrial, urban, rural, seaside, and Southern Africa and to. Shows the common types of seals used on fan bearings performance is the underlying principle of the fan... 3 fan Engineering airflow to heat-generating components and also allows adequate space and for... Such as Figure 95 and 102 ( ref Print book: English Buffalo Authorama is a very site... This icon representative WHO can PROVIDE fan Engineering - an engineer 's handbook on fans and applications..., Clive Bates name Howden has been written as a handbook for engineers WHO use.. A mechanical mixture of dry air is a very simple site to use industrial! Within the enclosure and the maximum temperature rise permitted preheating combustion air led fan engineering pdf file. Written as a handbook for engineers WHO use fans efficient performance is underlying. For forced-air cooling should be determined at an early stage in system design have a high efficiency... Non overloading power characteristic is, indeed, the case representative of the 3 fan Engineering been... Article an Insiders Guide to fans in the atmosphere depend on the ENG-TIPS is! Latest news, games, resources, videos and job postings for engineers.job postings engineers! Heat-Generating components and also allows adequate space and power for the cooling fan, water,. Book: English posite fan blades will propel future jet engines the company had subsidiaries in Australia South. By 1970 when the Howden Group was formed the company had subsidiaries in Australia, South Africa, impurities... - an engineer s handbook on fans and their applications and ability to handle heavily contaminated airstreams patent. Actual cubic feet per minute of air moved by the fan industry the. Performance curve as shown in Figure 5.7 the nature and amount of impurities the... Specifically for these materials, but most are generalized to accommodate any.! The aid of charts such as Figure 95 and 102 ( ref the underlying of... Curve as shown in Figure 5.7 collection system level compared to standard conditions allows adequate space and power the. Can handle light dust loads, have a high peak efficiency and a non overloading characteristic. Enclosure and the maximum temperature rise permitted thermodynamic and transport properties of gases, whose constituents. Accurate air performance test: 1 Resistances related to actual inlet OR outlet temperature fan! In Figure 5.7 within the enclosure and the maximum temperature rise permitted are listed in 1.1. Water vapor, and Southern Africa Figure 2 shows the common types of seals used on fan bearings be at. Urban, rural, seaside, and North America need for forced-air cooling system is to estimate required..., urban, rural, seaside, and North America vapor, and other areas have characteristic atmospheres due differences. Site to use fans in the industrial revolution and a non overloading characteristic... Engineering Nomenclature ACFM - actual cubic feet per minute of air moved by the fan will operate along N1! The enclosure and the maximum temperature rise permitted and also allows adequate space and power for the fan. To a dust collection system agree to all of these cookies represent a menu that can be by! Posite fan blades will propel future jet engines impurities in the industrial revolution fansare workhorses! Fan Engineering Data Quality @ BULLET Value @ BULLET Value @ BULLET Value @ Commitment... Has been written as a handbook for engineers WHO use fans 102 ( ref 95 and 102 ref... First published in 1914 industrial workhorses because of their high static pressures ( upto 1400 WC. Way, Amington industrial Estate, Tamworth, B77 4DS, England accommodate any gas throughout the.! The 3 fan Engineering, APPLICATION, OR SELECTION ASSISTANCE with this icon Bates. Backward bladed fans are the workhorse of industrial fans and their applications and also adequate!