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  • Understanding Fan System Effects

    The air movement 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 difference in how the fan was tested, comp

  • How to Prevent Thermal Expansion and Contraction in HVAC Grilles, Registers, and Diffusers (GRD)

    What if the occupants of a newly constructed building hear clicking or popping noises coming from the linear diffusers as the air conditioning is cooling the space? This issue can be frustrating, and it's important to understand why this situation can occur and how to prevent it from happening. In t

  • Benefits of Heating Warehouses with Direct Gas-Fired Equipment

    Direct gas-fired equipment has been used for many years in industrial make-up air applications. Benefits including 92% thermal efficiency, low first cost, and compact footprints make direct gas-fired equipment the ideal choice. For these same reasons, direct gas-fired equipment is also a great fit f

  • Achieve Long-Term Indoor Air Quality with These DOAS Fundamental Features

    Investing in dedicated outdoor air systems (DOAS) for your building can ensure lasting indoor air quality (IAQ) for the life of the equipment. This assumes the DOAS units receive regular maintenance and that the DOAS equipment you purchase has the fundamental features designed to protect the unit. T

  • Benefits of Air Balancing and Commissioning for Make-Up Air Units

    Make-up air unit commissioning for new projects or pre-existing buildings is a quality assurance process to verify and document that HVAC systems function as specified and meet the operational needs of the building. The value of the initial commissioning is represented by operating savings, unit per

  • How to Select and Apply Balancing Dampers

    It is more important than ever for a building’s HVAC system to be adjusted and balanced correctly to achieve the required indoor air quality at the lowest possible operating costs. Pressure imbalances within an HVAC system can make it more difficult to maintain a given condition within a room (i.e.,

  • How to Prevent Condensation in HVAC Grilles, Registers, and Diffusers (GRD)

    Finishing a newly constructed building is a moment of great satisfaction and excitement for everybody involved. However, what if, after all the hard work and dedication, occupants begin to notice water dripping from the metal HVAC grilles when the air gets too cold? Or what if you hear clicking or p

  • Meeting Energy Code Requirements with Fan Energy Index (FEI) Ratings

    State Energy Code Requirements The deadline for states to comply with U.S. Department of Energy (DOE) commercial building energy code stipulations was July 28, 2023. To satisfy DOE regulations, states must certify that their energy codes deliver energy savings at least equivalent to ANSI/ASHRAE Stan

  • Product Application Articles: Fan Sound

    Product Application Articles: Fan Sound Sound is a critical consideration in the selection and application of fans. Despite this, fan sound remains one of the least understood topics in the air handling industry. This series of articles provides a better understanding and point of reference on how f

  • How to Specify HVAC Equipment to Attain LEED Certification

    Leadership in Energy and Environmental Design (LEED) is nearly 30 years old. The voluntary rating and certification program has had a profound impact on the direction of building design and construction. More than 93,000 projects and more than 19 billion square feet of space have qualified (register

  • Save Time and Money with True Round Life Safety Dampers

    Building codes require life safety dampers to protect openings in walls, ceilings, floors, and/or partitions to prevent the spread of fire and/or smoke. The four types of life safety dampers are: Fire dampers Smoke dampers Combination fire smoke dampers Ceiling radiation dampers Round ductwork requi

  • What you need to know about ASHRAE 90.1-2022, FEG, and FEI - Part I

    ASHRAE 90.1 revisions over time have reduced HVAC energy consumption in nonresidential buildings by 50% since the standard's introduction in 1975. Like software updates that incorporate improvements and bug fixes, so it is with standards and code revisions. Hence this is the reason to update your pr

  • What you need to know about ASHRAE 90.1-2022, FEG, and FEI - Part II

    In our previous blog post, we explained the inconsistencies that were in the Fan Efficiency Grade metric (FEG) which was included in ASHRAE Standard 90.1-2019 and other energy standards. Because of these inconsistencies, the FEG metric could not accurately define the most energy-efficient fan for an

  • Air Terminal Units – The Basics

    Ever think to yourself, how come I can adjust the temperature in the conference room without affecting my office? The answer is air terminal units (ATUs)! Why use ATUs? ATUs, also referred to as VAV boxes, allow occupants in a specific zone to adjust the temperature to their comfort level by regulat

  • Addressing Two Trends that will Strain Efficiency in the Warehouse

    The COVID-19 pandemic will continue to shape our world for years to come. Two trends—growth in e-commerce and the need for improved indoor air quality (IAQ)—have increased in significance because of the pandemic. Interestingly, these trends place added pressure on warehouse operations to meet growin

  • Bubble-Tight Damper Performance Requirements

    In today’s world of harmful chemicals, particulate matter, and noxious gases, bubble-tight dampers are more important than ever. A bubble-tight damper is an isolation damper designed to meet the performance requirements for zero leakage in critical leakage applications such as clean rooms, medical f

  • Ventilation Fundamentals for Indoor Air Safety

    The National Education Association cites that nearly 57.5 million students and school employees enter the doors of our nation’s schools every day. According to estimates from the U.S. Environmental Protection Agency, half of these adults and children spend their school days breathing air polluted wi

  • What Are the Effects of Increasing Air Filtration Requirements on Fan Performance?

    The Centers for Disease Control and Prevention have recently released guidance for improving air quality in buildings. In addition, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has recently published ASHRAE Standard 241P, Control of Infectious Aerosols. Thes

  • Understanding GRD Performance Data and Applications

    Grilles, Registers, and Diffusers (GRDs) are designed to enable the efficient distribution of conditioned air within a given space. Each type of GRD product offers unique advantages and disadvantages, making them suitable for specific applications. When it comes to selecting GRD products, engineers

  • Static Pressure, Throw, NC Level, and Other GRD Terms (Get to Know the Language of GRD)

    Anyone who works in the HVAC industry knows it has its own language. Heating, ventilation and air conditioning (HVAC) language contain words and acronyms that, outside of the industry mean little to the average person. Subsets of the HVAC industry also use specialized terms to describe the function

  • What You Need to Know About Fire Ratings to Select the Correct Ceiling Radiation Damper

    Selecting the correct ceiling radiation damper (firestop flap for our friends in Canada) requires a solid understanding of the testing and expected damper performance. This understanding guides the selection based on the protection needed and shows the importance of proper selection and installation

  • How Do Thermally Actuated Diffusers Conserve Energy in Commercial Buildings?

    With HVAC systems and fans comprising over 35% of a building’s overall energy consumption, it’s imperative to incorporate energy-saving devices into the HVAC system design. Thermally Actuated Diffusers are useful devices to help conserve energy while creating more comfortable environments. What are

  • Addressing the Challenges of Operating Room Air Distribution

    What differentiates critical environments from regular commercial construction is the necessity for very carefully controlled parameters for the quality of air. These parameters could include specific temperatures, humidity, pressure, velocity, particle counts, oxygen content, etc. In addition to th

  • Will the Energy Crisis Choke the Lifeblood Out of Data Centers?

    What happens when you combine a fragile supply chain, a pandemic, and a wildly unexpected rapid economic rebound? The answer most often is short-term shortages. However, because the combination of events covered the entire world, the short term is lasting longer and causing more challenges. The ener

  • Choosing the Right Air Distribution Partner for Data Centers

    Choosing the right air distribution partner is essential to the success of data center projects. Power costs are a critical element of data center operations. With the constant need to keep servers cool, energy-efficient air movement must be an integral part of the core strategy to reduce overall po

  • Podcast: Energy Recovery: A Clear Solution for Improved IAQ in Existing Buildings

    Energy Recovery: A Clear Solution for Improved IAQ in Existing Buildings Improving IAQ through mechanical ventilation presents many challenges, especially in existing, and often outdated, buildings. Listen as Tyler Mancl, P.E. of Greenheck talks with ACHR News about how Energy Recovery Ventilators (

  • How Recent Changes in UL Standards Affect Fans

    You may have been familiar with fans meeting UL Listing criteria that aligned under three UL Standards: Power Ventilators (UL 705), Power Ventilators for Smoke Control, and Power Ventilators for Restaurant Exhaust (UL 762). As of June 2021, UL made changes to these standards. Here’s a breakdown of w

  • Changing the Narrative: From Indoor Air Quality to Indoor Air Safety

    Before the pandemic, the majority of us took for granted that the air we breathe indoors is safe, just as we trust the water we drink is safe. Since the pandemic, we’ve learned that this is not always the case. Indoor Air Quality (IAQ) suddenly became a hot topic due to airborne viral transmission,

  • Energy Recovery: A Clear Solution for Improved IAQ In Existing Buildings

    As building occupancy continues to return to pre-pandemic levels in the wake of COVID-19, a heightened awareness exists to improve the quality and safety of the air we breathe. The most proven and longstanding method of doing this is by increasing the amount of ventilation, or fresh air, that we bri

  • Data Center Energy Efficiency

    According to the Department of Energy, data centers are one of the most energy-intensive building types, consuming 10 to 50 times the energy per floor space of a typical commercial office building. Collectively, these spaces account for approximately 2% of the total U.S. electricity use and will con

  • The Importance of Handing - Air Terminal Units with Hot Water Coils

    Air terminal units (ATUs) are essential to the air distribution system within commercial buildings. These units are responsible for delivering conditioned air from an air handler to the occupied space. ATUs are often equipped with reheat capabilities, either electric or hot water coils, for fine-tun

  • What are the Top Questions Engineers and Contractors Ask about Life-Safety Dampers?

    Greenheck manufactures several hundred different damper products. Each offers variations to customize the product to specific applications. This large number of dampers and variations can create a little confusion. We receive many questions regarding life-safety damper products. The following are am

  • EC Motor Fundamentals: Choosing the Right Motor—EC versus Belt Drive

    New developments in EC motor technology and a growing list of benefits make EC motors attractive options in fan applications. But do these benefits make traditional belt drives obsolete? Let’s consider why customers select EC motors. All motors in fan equipment have two magnetic fields located in th

  • How to Improve HVAC Systems by Making a Fraction of an Inch Change

    The impact HVAC grilles and registers have in a total ventilation system may seem small compared to the system overall. However, a fraction of an inch in the spacing of the grille or register blades makes a big difference. Most supply and return grilles use 3/4" blade spacing, but evidence suggests

  • Louver Fundamentals: Understanding Louver Performance Criteria

    The proper selection of louvers can be complex as many variables determine how they will perform. An understanding of basic louver performance criteria including free area, air volume, the beginning point of water penetration, and pressure drop can help guide your louver selection process. These per

  • Podcast: Improving Indoor Air Quality And Energy Efficiency In Schools

    Schools in Focus: Greenheck School Ventilation Solutions Mike Wolf, Director of Industry & Regulatory Relations, and Tyler Mancl, Principal Application Engineer, talk about improving indoor air quality and energy efficiency in both new and retrofit school facility applications in Spaces4Learning’s S

  • HVAC Energy Recovery Technologies: Wheel versus Core

    Energy recovery technology is commonly used in industrial, commercial, and institutional applications to provide comfort ventilation. Utilizing energy recovery allows for the supply airstream to be pre-conditioned by the return airstream, effectively reducing the amount of mechanical cooling or heat

  • Louver Fundamentals: Form Meets Function

    What exactly is a louver? What is its function in a building and an HVAC system? Simply, a louver is a device comprised of blades that permit the flow of air but inhibits the entrance of water or other elements. But simple doesn’t truly get at the form and function of louvers. Selecting the correct

  • Effective Strategies for Healthier Indoor Air

    The importance of indoor air quality (IAQ) has continued to grow as we focus on improving societal health. Of course, the COVID pandemic has reinforced the need for well-designed ventilation systems that provide improved IAQ. If you are focused on improvement, particularly by reducing the efficacy o

  • Exhaust System Stack Design and Plume Rise

    One of the critical features of a properly designed laboratory or industrial exhaust system is the exhaust stack. The exhaust stack helps ensure polluted exhaust is dispersed into the atmosphere before it can be re-entrained into building air intakes or settle on occupied areas such as building entr

  • Fire Dampers 102: Application, Installation, Options, and Accessories

    In our Fire Dampers 101 blog post, we discussed the different types of fire damper products and the associated testing and rating requirements. In this post, we will examine the correct application and installation of fire dampers, and review some of the available options and accessories. Applicatio

  • 3 Reasons to Work with a Greenheck Rep

    Many in the HVAC industry have a go-to-market model using manufacturer’s representatives as the sales force. Finding every niche in a geographical market requires a large sales team, more than most companies can afford. The manufacturer’s reps provide tremendous value to customers in their local mar

  • Podcast: Amplifying UV-C performance for better IAQ

    Newsmaker’s Coverage of AMPLIFY™ Overhead fans with Northern Light® Technology Listen as Tyson Sargent, segment manager for Greenheck’s overhead HVLS products, shares valuable information on AMPLIFY™ overhead fans with Northern Light® technology. Once you've listened to the podcast, read more about

  • Leverage Employee Comfort and Make it a Critical Part of Your Hiring Strategy

    “How do I attract and retain employees for my distribution centers?” That’s a great question because the warehousing and storage market segment is growing exponentially. From 2010 through projections for 2022, CAGR for the Warehouse segment have come back at nearly 25% (Dodge Data & Analytics) with

  • A healthier, more comfortable, environment for employees and plants.

    A typical outdoor greenhouse can reach 110ºF inside making conditions uncomfortably warm and humid especially during summer months. Air movement is critical to lowering the temperature as well as moisture evaporation to help keep plants healthier.

  • 5 Ways to Create and Maintain Perfect Building Temperature Using the Right Equipment

    If you've ever worked when it's too hot or too cold, concentrating, being productive, and getting the job done is tough. Sweat dripping into your eyes or tensed up muscles from the chill can make life exponentially harder. That’s why maintaining a relatively stable and comfortable temperature is so

  • Fans vs. Air Conditioners: Which Cools Better?

    Keeping an indoor space at a comfortable temperature is extraordinarily important. There are many options available to accomplish that task, and some are far better than others. The two basic methods are fans and air conditioners but figuring out exactly which works best for your particular situatio

  • How to Cool a Building Without Air Conditioning

    When the weather warms up, an air conditioning unit can help keep large indoor spaces comfortable. But sometimes installing an air conditioning unit isn’t always possible or economical, so finding ways to cool the interior of a building without using AC is necessary. There are numerous benefits to k

  • Three Tactics to Improve Indoor Air Quality (IAQ) in Schools and Commercial Buildings

    The COVID-19 pandemic has opened the eyes of many regarding the importance of indoor air quality (IAQ) in schools and commercial buildings. Poor IAQ causes illness and other health problems. The impact of poor IAQ becomes worse when you consider this key statistic: The Environmental Protection Agenc

  • How to Avoid the High-Temperature (and Odorous) Exhaust Associated with Diesel Generators

    Electricity. Practically everyone uses it. We power everything from a children's toy to hearing aids using some form of electrical power. Electric power makes life productive and comfortable. Sometimes, it even saves lives. However, what happens when the power is interrupted? For most, it's an irrit

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