Application Articles

58 articles found.

  1. Damper Applications: Industrial Damper Torque - How the Options You Select Affect Actuator Selection and Costs (DA/102-13)

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    This article will provide background on the various causes of damper torque and help you understand how these causes may affect your overall required torque to operate the damper and the cost impact of over-specifying. Unlike commercial HVAC dampers, operating...
    September 17th, 2013

  2. Codes and Standards: Understanding Fan Efficiency Grades (FEG) (CS/104-13)

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    Government agencies and regulatory bodies in the U.S. and around the world are working on regulations to help reduce power consumed by fans in commercial and industrial ventilation. As a part of this effort, an efficiency metric known as Fan Efficiency...
    February 13th, 2013

  3. Codes and Standards: New Test Standards for Louvers - International Building Code and Florida Building Code

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    The International Building Code (IBC) version 2012 along with the latest Florida Building Code (FBC) version 2010 have introduced new wind speed and load requirements along with new large missile impact requirements relative to wall louvers within the defined...
    October 29th, 2012

  4. Fan Applications: An Analysis of Induced Flow Laboratory Exhaust Fan Systems and the Benefit of AMCA 260 Certified Performance FA/128-12

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    Independent third party verification of ventilation system components is valuable in ensuring performance and safety. This is especially true for critical lab exhaust systems. Air Movement and Control Association (AMCA) International Inc. certifies induced-flow...
    April 6th, 2012

  5. Fan Applications: Performance Coatings for Ventilation Products (FA/110-04R5)

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    Coatings are a very important consideration when meeting the requirements of a particular application. Coatings are primarily required because of corrosive environments and/or for a decorative appearance. Greenheck Fan Corp. supplies an extensive range of high...
    June 30th, 2011

  6. Fan Applications: Measuring Belt Tension (FA/127-11)

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    This article discusses several methods for measuring the belt tension for V-belts commonly used in HVAC applications. Tensioning the belt is often done during initial startup and periodically throughout its life for preventative maintenance. Common belt tensioning...
    February 11th, 2011

  7. Codes and Standards: New Test Standard for Dilution Blowers (CS/102-11)

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    For reasons of safety and health, not to mention litigation, consulting and facility engineers have long insisted on independent performance verification for fans and blowers used in general HVAC, as well as more critical applications. With their unique discharge...
    January 25th, 2011

  8. Fan Applications: Seismically Rated Fans (FA/125-10)

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    When a project calls for seismically rated equipment, there are a number of code requirements that need to be considered. This article outlines the methodology of the seismic certification process and considerations involved to properly determine the need for...
    December 8th, 2010

  9. Fan Applications: Fan Applications (FA/126-08)

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    There are many different types of fans and many applications in which they can be used. For an application to be successful and work as intended, the fan and system must be compatible both structurally as well as from a performance standpoint. This section...
    July 28th, 2009

  10. Fan Applications: Spark Resistant Construction (SRC) (FA/116-08R)

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    One of the critical uses for ventilation equipment is the movement of potentially explosive gases. Engineers and designers who specify these systems must exercise caution when selecting equipment to ensure continuous and safe system operation. This article...
    November 1st, 2008

  11. Energy Recovery Applications: Optimizing Dedicated Outdoor Air Systems (ERA/114-07)

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    Optimizing Dedicated Outdoor Air Systems Bringing outdoor air into a building is vital for maintaining good indoor air quality. However, outdoor air can be very expensive to temper and, if not properly conditioned, can cause humidity problems for the building....
    July 1st, 2007

  12. Energy Recovery Applications: Fire Safety Standards and Energy Recovery Ventilators (ERA/112-05)

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    Greenhecks Commercial Energy Recovery Unit The subject of fire safety is an important issue for customers and the engineering community. The following will serve as a guide to the fire safety issue including factual information about the codes and standards...
    July 25th, 2005

  13. Energy Recovery Applications: Frost Control for Energy Recovery Wheels (ERA/113-05)

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    Frost control for energy recovery devices comes in various strategies  all of which are designed to do what the name suggests  control frost. This article will discuss frost control strategies as they apply to a passive, air-to-air energy recovery wheel process...
    July 25th, 2005

  14. Fan Applications: Variable Volume Laboratory Systems, an Overview (FA/124-05)

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    Typical Variable Volume Exhaust Laboratory On a variable volume laboratory exhaust systems; air is exhausted through fume hoods, as well as a through general exhaust grille(s), using a laboratory exhaust fan system. One of the goals of the exhaust fan system...
    July 25th, 2005

  15. Energy Recovery Applications: ASHRAE Standard 62 Addendum y - Acceptable Cross Leakage for Energy Recovery Applications

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    With addendum y of ASHRAE Standard 62-2001 (Ventilation for Acceptable Indoor Air Quality), HVAC system designers now have clear-cut parameters for allowable ERV cross leakage/cross contamination. This article communicates some of the key elements of this addendum....
    October 21st, 2004

  16. Technical Information: Gauge and Weight Chart for Sheet Steel, Galvanized Steel,Stainless Steel, and Al

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    This article provides a quick reference to gauges of material, pounds per square foot, and gauge decimal equivalents. Gauge Sheet Steel Galvanized Steel Stainless Steel Aluminum Gauge Decimal Lbs. per Sq. Ft. Gauge Decimal Lbs. per Sq. Ft. Gauge Decimal Lbs....
    September 1st, 2004

  17. Technical Information: Metric conversion Factors for Fan Application per AMCA Standard

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    Quantity "English" Unit Metric Unit Conversion Factor Volume cubic feet per minute CFM cubic meter per second m^3/S cubic meter per minute m^3/min cubic meter per hour m^3/hr liter per second l/s 0.00047195 0.028317 1.6990 0.47195 Pressure inches of water gauge...
    September 1st, 2004

  18. Fan Applications: Are Bearing Currents Causing Your Motor Failures? (FA/117-03)

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    Are Bearing Currents Causing Your Motor Failures? “We just lost another motor! Why are all of our motors failing?” Does this sound familiar? If you’re at a loss to explain why your motors seem to experience premature failure one after another, take a step back...
    January 22nd, 2004

  19. Fan Applications: Radiated Sound (FA/122-03)

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    Radiated sound is a very important consideration in the selection and application of fans. In spite of this, radiated sound continues to be one of the most misunderstood topics in the air handling industry. This is the third article in a series of four articles...
    January 22nd, 2004

  20. Fan Applications: Sound Criteria, Attenuation Techniques and Preventive Measures to Limit Sound Problems (FA/123-03)

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    Sound is a very important consideration in the selection and application of fans. If not properly evaluated, fan sound can turn an otherwise completely acceptable application into a disaster. In spite of this, fan sound continues to be one of the most misunderstood...
    January 22nd, 2004

  21. Energy Recovery Applications: ARI Certified vs. Non-Certified Performance Ratings of Energy Recovery Wheels (ERA/110-03)

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    Engineers rely heavily on manufacturers' performance data for product selection. The quality of the data needs to be ensured so engineers can meet their design intentions and can accurately compare products from different manufacturers. For these reasons, our...
    October 1st, 2003

  22. Fan Applications: Centrifugal Fan Arrangements (FA/119-03)

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    Centrifugal fans are typically offered in several arrangements, or in other words, the position of the motor relative to the fan. When deciding on the best arrangement of a fan there are three main criteria which may influence your choice: 1. Fan performance...
    October 1st, 2003

  23. Fan Applications: Fan and System Troubleshooting - A Guide to Characteristic Field Problems (FA/118-03)

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    Modern day technology provides many tools for accurate and reliable fan and system design. Gone are the days when cheap energy allowed the use of "rules-of-thumb" and large safety factors to be part of the design process. However, even with modern technology,...
    October 1st, 2003

  24. Fan Applications: The Basics of Fan Sound (FA/121-03)

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    Fan sound is a very important consideration in the selection and application of fans. In spite of this, fan sound continues to be one of the most misunderstood topics in the air handling industry. In an effort to provide a better understanding and point of...
    October 1st, 2003

  25. Energy Recovery Applications: Cross Leakage - Application and Purge Considerations (ERA/108-02)

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    There appears to be some misconceptions surrounding energy recovery wheels and the need to minimize airstream cross leakage. One area of confusion relates to acceptable cross leakage rates to differing applications. Another area of misunderstanding pertains...
    November 7th, 2002

  26. Energy Recovery Applications: Sizing Air Conditioning Equipment to Maximize Energy Recovery Benefits(ERA/107-02)

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    Many designers have realized the benefits of energy recovery. In addition to complying with ASHRAE 62-1999 while controlling operating expenses, a properly designed ventilation system that incorporates total enthalpy recovery will realize the following benefits....
    November 7th, 2002

  27. Energy Recovery Applications: Energy Recovery Wheel Maintenance (ERA/106-02)

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    The routine maintenance requirements of all equipment needs to be considered in the initial system design. If equipment is difficult to maintain, chances are it will be ignored, reducing the effectiveness and life expectancy of the equipment. The maintenance...
    November 1st, 2002

  28. Energy Recovery Applications: The Importance of ARIPerformance Certification for Energy Recovery Ventilators (ERA/109-02)

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    Engineers rely heavily on manufacturers performance data for product selection. The source of the data needs to be credible to ensure that engineers meet their design intentions. In the selection process, engineers typically review data from multiple manufacturers...
    October 29th, 2002

  29. Fan Applications: Understanding the Development of Fan Sound Data and the Product Rating Process (FA/120-02)

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    Sound is a very important consideration in the selection and application of fans. If not properly evaluated, fan sound can turn an otherwise completely acceptable application into a disaster. In spite of this, fan sound continues to be one of the most misunderstood...
    October 29th, 2002

  30. Fan Applications: An Outline for Successful Fan Selections (FA/112-02)

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    This article outlines the considerations involved to properly select, apply and control fans. Emphasis is placed upon matching the fan equipment to the requirements of the system from several different perspectives. However, specific fan design and construction...
    October 1st, 2002

  31. Fan Applications: Multiple Fan Systems - Fans in Series and Parallel (FA/115-02)

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    In most fan systems a single fan is selected for the required system design rating. Various methods of control are employed such as dampers, variable inlet vanes, variable pitch blades or variable speed to meet other operating points defined by the system duty...
    October 1st, 2002

  32. Technical Information: General Conversion Table (TI/100-02)

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    July 1st, 2002

  33. Damper Applications: Actuators for Commercial HVAC Dampers (DA/101-02)

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    To accomplish its intended purpose, every damper installed in an HVAC system must be equipped with an appropriate actuator. Selection of the appropriate actuator for a specific damper requires the consideration of a number of factors. This article will examine...
    June 1st, 2002

  34. Fan Applications: Field Testing Overview (FA/114-02)

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    This article provides an overview of field testing and how the principles contained in AMCA 203, Field Performance Measurement of Fan Systems, can be applied. (The AMCA publications described in this article may be obtained from www.amca.org. ) The purpose...
    March 1st, 2002

  35. Make-Up Air Applications: Industrial Heating Equipment Comparison and Evaluation (MUA/100-02)

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    The purpose of this application guide is to provide an objective evaluation of five different gas-fired industrial space heating systems. Each evaluation offers a basic operational description, benefits and drawbacks. A comparison chart is included that rates...
    March 1st, 2002

  36. http://www.greenheck.com/library/articles?c=900: Suggested Air Changes for Good Ventilation (TI/101-02)

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    The most common method used to calculate cfm requirements for a given fan or fans is based on complete changes of air in a structure or room in a given time period. To determine the cfm required to adequately ventilate an area,divide the room volume (in cubic...
    March 1st, 2002

  37. Fan Applications: Motor Application Guide for Ventilation Products (FA 113-01)

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    The evaluation of a fan's motor is a time consuming part of the design of air handling equipment. Selection of the proper electrical characteristics and construction features can involve factors not known to everyone. The purpose of this article is to aid in...
    December 1st, 2001

  38. Fan Applications: High Temperature Exhaust (FA/109-01)

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    "Many are never used; some are used just once; others are used all the time." What are they? They're high temperature exhaust fans. High temperature exhaust fans can be grouped into two general categories: emergency smoke evacuation and process ventilation....
    June 15th, 2001

  39. Damper Applications: New UL Test Standards for Life Safety Dampers (DA/100-01)

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    To address the changing requirements in building codes, system design, and product application, Underwriters Laboratories (UL) is continually revising and upgrading their Standards for Safety to assure end users that products will perform their intended function...
    June 1st, 2001

  40. Fan Applications: Balance, vibration, and vibration analysis (FA/108-00)

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    There are many factors that can have a substantial effect on the vibration level of air movement equipment; such as wheel balance, rotational speed, drive components, motor operation and wiring. Providing equipment that operates well within acceptable vibration...
    February 26th, 2001

  41. Fan Applications: A Guide to Explosion Resistant Disconnect Switches for Ventilation Products (FA/107-00)

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    This article addresses the mounting and wiring of two types of explosion resistant disconnect switches. Explosion resistant disconnect switches are a recommended and necessary safety feature for every fan operating in a hazardous environment. Mounted directly...
    December 1st, 2000

  42. Energy Recovery Applications: Silica Gel Dessicant (ERA/105-00)

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    Silica gel is a highly porous solid adsorbent material that structurally resembles a rigid sponge. It has a very large internal surface composed of myriad microscopic cavities and a vast system of capillary channels that provide pathways connecting the internal...
    July 1st, 2000

  43. Louver Applications: Wind-Driven Rain Testing for Louvers (LA/100-00)

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    Different regions of the world require special considerations for building construction and component design. One consideration is a climate with severe wind and rain, such as hurricanes. Typical louvers in the industry were not originally designed or tested...
    July 1st, 2000

  44. Fan Applications: A Guide to Disconnect Switches for Ventilation Products (FA/106-00)

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    Fan-mounted disconnect switches are a recommended and necessary safety feature for every fan. Mounted directly on the fan, within sight and reach, disconnect switches provide the best protection against accidental startup during service or inspection. Disconnect...
    June 1st, 2000

  45. Fan Applications: Inlet Pressure Correction (FA/105-00)

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    A fan rating consists of five different interdependent variables - flow rate, pressure, speed, power and density. However, it isn¹t always recognized that flow rate and density are based upon fan inlet conditions. When the inlet pressure exceeds 10 inches in...
    May 1st, 2000

  46. Energy Recovery Applications: Moisture Transfer and Fungal Growth in Desiccant-based Enthalpy Wheels (ERA/104-00)

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    There is evidence that fungi germinate when water condenses onto surfaces of air handling systems where nutrients are present. Surfaces which remain wet for a period of 12 to 24 hours allow fungi and mold spores already present to "bloom", resulting in a potential...
    May 1st, 2000

  47. Fan Applications: Fan Discharge and Throw Information (FA/104-00R)

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    The following information provides general guidelines for selection and placement of fans used for air circulation and personnel cooling. The first subject that the designer must address is what velocity of air will provide personnel comfort in the working...
    April 1st, 2000

  48. Energy Recovery Applications: Gasseous Carryover and Cross Leakage in Energy Recovery Wheels (ERA/103-00)

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    There seems to be a certain degree of confusion in the industry as to what measures are appropriate to limit gaseous carryover and cross leakage of energy recovery wheel products. Of course, gaseous carryover and cross leakage is something that we would like...
    April 1st, 2000

  49. Fan Applications: Understanding Bearings for the Fan Industry (FA/103-00)

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    Bearings are one of the most critical components in the operation of a fan and careful consideration must be given to the selection of the appropriate bearing for each application. Fan manufacturers that have comprehensive product line ranging from small light...
    April 1st, 2000

  50. Fan Applications: Understanding Temperature and Altitude Corrections (FA/102-99)

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    The most common influences on air density are the effects of temperature other than 70°F and barometric pressures other than 29.92 caused by elevations above sea level. Ratings found in fan performance tables and curves are based on standard air. Standard...
    April 1st, 2000

  51. Energy Recovery Applications: Energy Recovery Ventilators - Stand Alone vs. Bolt-on Systems (ERA/102-00)

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    Many HVAC system designers have realized the benefits of using Energy Recovery Ventilators (ERVs) in commercial and institutional buildings. However, as with many newly adopted technologies, questions of how best to apply this product are being raised. One...
    March 1st, 2000

  52. Fan Applications: Understanding Fan System Effects (FA/101-99)

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    The air moving industry uses a common term to describe certain inlet and outlet conditions that adversely affect fan performance. The term used is "system effect". Perhaps the term should be "fan installation effect", because system effect results from the...
    March 1st, 2000

  53. Energy Recovery Applications: Energy Wheels vs. Plates (ERA/101-00)

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    For commercial and institutional comfort ventilation applications, total energy heat wheels are far superior to plates in terms of total heat transfer. The reason is simple: Wheels transfer latent energy (moisture), plates do not. Both wheels and plates transfer...
    December 1st, 1999

  54. Fan Applications: The Basics of Fan Performance Tables, Fan Curves, System Resistance Curves and Fan Laws (FA/100-99)

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    Engineers and designers who select and specify fans should have a good basic knowledge of the content of this article. An understanding of these subjects is vital for verifying the original fan selection, trouble shooting after the installation, and understanding...
    December 1st, 1999

  55. Codes and Standards: UL - Product Safety Certification in Air Movement and Control (CS/101-00)

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    The UL product safety certification organization is dedicated to product safety, just as AMCA is dedicated to the certification of performance ratings for our industry. Most of us are familiar with UL Listings only as they pertain to electrical appliances,...
    December 1st, 1999

  56. Energy Recovery Applications: Energy Recovery Ventilators: The Engineer's Solution (ERA/100-00)

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    Evidence continues to mount that adequate ventilation in the workplace is necessary for a healthy and productive indoor environment. The current ASHRAE ventilation standard (62-1999) addresses this need by requiring 3 to 4 times more outside air than standard...
    November 1st, 1999

  57. Codes and Standards: Why AMCA? Because you need the performance you specify. (CS/100-99)

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    The engineers and designers who select and specify products of all types for building projects carry a great deal of responsibility. That's why you need to specify fan, damper, and louver products that are AMCA licensed and that each individual product bear...
    October 1st, 1999

  58. http://www.greenheck.com/library/articles?c=0: http://www.greenheck.com/library/articles/90

    December 31st, 1969

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