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  • Provide correct air changes to laboratory, office and warehouse.

    Providing a 100% outdoor air ventilation solution can be challenging when a rooftop installation will not work. Learn how Greenheck’s solution allowed for the installation of dedicated outdoor air systems units without costly plenum curbs.

  • Dollar Per CFM - Why is it Important

    Many options exist for building ventilation. Most options depend on the building’s use. For example, warehouses, distribution centers, and manufacturing buildings often use a combination of gravity and powered fan equipment to ventilate the facility. This method is popular because it offers effectiv

  • Why is My Bathroom Mirror Foggy?

    Bath Fans and the Importance of Certified Airflow Should a company manufacture products that perform as tested in ideal conditions or conditions based on real-life experiences? This conundrum is an age-old debate. For example, would you buy a new vehicle that advertised its fuel efficiency based on

  • When is Make-Up Air Required for Kitchens?

    When is Make-Up Air Required for Kitchens? Have you ever left a restaurant smelling like you’ve been cooking burgers for hours? If you have, it could be that the restaurant has a make-up air/exhaust system not working correctly. Selecting the correct make-up air solution for your kitchen can be the

  • Be Confident In Your HVLS Fan Selections

    High volume, low speed (HVLS) fans are large diameter ceiling fans that circulate large volumes of air at low operational speeds. These fans are increasingly popular because of two main uses-- thermal comfort and energy efficiency. Several companies currently manufacture HVLS fans, providing end-use

  • Energy Efficiency and Indoor Air Quality Help Transform 94-Year-Old Building

    Older buildings have many qualities, such as architectural features not seen on many newer structures. However, few have the energy efficiency required to attract tenants. Learn how Greenheck’s solution improved energy efficiency and indoor air quality (IAQ).

  • How to Select the Best Kitchen Hood for a Residential Kitchen in a Commercial Building

    Selecting a kitchen hood is a relatively straightforward decision for a restaurant or commercial kitchen. The decision is equally straightforward when purchasing a kitchen hood for your house. One simply selects the features needed and desired that meet the various building codes for the location an

  • What You Need to Know About DOAS And the New Efficiency Ratings

    Dedicated outdoor air systems (DOAS) are gaining popularity in the commercial HVAC industry. These systems consist of ventilation units that dehumidify 100% outdoor air coupled with air handling units that heat or cool the space air. Figure 1 is a schematic of a typical DOAS. Figure 1: DOAS units pr

  • How to Adjust Your HVAC System and Minimize the Spread of COVID-19

    Keeping people safe and protected from contagious viruses has reached unprecedented levels over the past few months. Leading organizations such as the Center for Disease Control (CDC) and medical professionals stress the need for common sense practices to slow the spread of COVID-19 and other contag

  • Sign-Up for and Comment on Fresh Air Blog Posts

    Greenheck’s Fresh Air blog recently added new functionality to make your blog experience even better. Now, you can have notifications of new blog posts sent directly to your email inbox. We know your time is valuable and this notification can save you time. But that’s not all. Our intention has alwa

  • How to Select the Proper Explosion-Proof Motor for Your Fan Application

    A variety of exhaust fans with spark-resistant designs that are suitable for contaminated and flammable environments are available in the marketplace. Many of these environments can use totally enclosed (TE) motors since the motors are not in the contaminated airstream and pose no threat to ignite a

  • Understanding the basic Operation of a Variable Volume Lab Exhaust System

    Lab ventilation systems are traditionally high users of energy based on the objectives of: Safely exhausting fumes and odors from the lab space Expelling fume and odor contaminants above the facility to prevent entrainment back into the lab or neighboring facilities Supplying 100% fresh make-up air

  • How Well do You know Your Industrial Isolation Dampers?

    Dampers can have many different functions within an HVAC or process application. One such function prevents or restricts the free flow of air, requiring the use of an isolation damper. Isolation dampers are generally two-position dampers and actuated to be fully open or fully closed. The degree of i

  • Elements of motor sizing

    What size motor best suits a fan? It is a common question that is more complex than one would imagine. Many variables exist based on an application. Different technologies also affect the fan selection. The following will discuss torque, horsepower and fan laws. Here is an example. “My direct drive

  • Understand the Energy Efficiency Codes Before Selecting an Inline Fan

    Are you in the market for an inline fan? Wonderful! Many energy-efficient options exist. But how do you know whether the inline fan you select offers the performance you want and complies with relevant codes and standards? Perhaps a better question is, do you know what codes and standards emphasize

  • How to Avoid Selecting the Wrong Ceiling Damper

    Ceiling dampers, also called ceiling radiation dampers (Figure 1), are crucial components of fire-rated floor/ceiling and roof/ceiling assemblies. However, confusion often occurs during the specifying and selection of these products. It is common to install the wrong damper, or worse, install each i

  • Exploring the Benefits of Factory-Installed Ceiling Radiation Damper—Bath Exhaust Fan Combination

    Bathroom exhaust fans are the most common way to properly ventilate and control moisture in residential bathrooms. Along with providing effective ventilation, bath fans with a ceiling radiation damper (CRD) are one of many components used to mitigate the spread of fire in many multi-family residenti

  • Fresh Air for the HVAC Industry

    Welcome to the blog for air movement, control, and conditioning professionals that addresses your technical interests and needs. You will find valuable information on topics important to you and your work as it relates to heating, ventilation, and air conditioning (HVAC). No hype or hyperbole—just v

  • Louver Requirements for the Hurricane-Prone Region

    Nearly 40 hurricanes and tropical storms have made landfall in the United States (U.S.) and its territories in the past 10 years. These storms pose an extreme risk for inhabitants of the areas affected. This risk includes injury and loss of life. Risk also extends to damage incurred to property—home

  • Aspirus Wausau Hospital Medical Surgical ICU Remodeling

    The intensive care unit of a hospital requires a unique approach to ventilation to protect against contaminated air and pathogens, and still maintain patient comfort. Learn how Greenheck provided the right solution.

  • Apply energy recovery to ventilation systems -- It's the Law!

    Recovering energy sounds pretty good, right? But how many realize it is possible to recover energy from HVAC equipment that is ventilating a space? An energy recovery ventilator (ERV) consists of a supply fan, exhaust fan, and an energy recovery device. The ERV takes spent/stale conditioned air from

  • How to Survive a Retrofit Fan Installation in a Tight Space Location

    Specifying and installing a [physically] large fan and its related housing in new construction frequently is quite easy. Exposed openings allow contractors to move it to the required location. However, that same installation to replace the existing equipment becomes far more difficult years after th

  • Understanding FEI; the new Fan Energy Index

    As the saying goes “The only thing that is constant is change.” As we all know, change isn’t always good. However in this case, changing to the new Fan Energy Index (FEI), replacing the much criticized and flawed FEG (Fan Efficiency Grade) metric, is great! FEI replaces existing fan energy metrics i

  • Considerations for Warehouse Summer Ventilation Systems

    Heat builds up in warehouses and distribution centers in the summer months without proper ventilation. Summer ventilation systems exhaust heated air from the warehouse and replaces it with fresh outdoor air. These systems replace the air in the building 1 – 3 times per hour, which minimizes the diff

  • Leading Causes of Coil Failures Explained

    Whether you own a large commercial building or are homeowner, you rely on heating, ventilation and air conditioning (HVAC) equipment to maintain the comfort level of your building. While this equipment is reliable, it inevitably fails. Then, if you find the culprit is a heating or cooling coil, you

  • The Impact of Poor Indoor Air Quality in Multifamily Buildings

    According to the United States Environmental Protection Agency (EPA), the concentration of some pollutants is often 2 to 5 times higher indoors than outdoors. The average American spends approximately 90% of their time indoors, so indoor air quality (IAQ) is extremely important to everyone’s health.

  • Improved Indoor Air Quality Raises Math/Science Scores

    tbd Indoor air quality is a concern in schools across the country. It affects health and the ability to learn. Yuma High School in Yuma, Arizona solved its air quality challenge and eliminated another common issue. Read about Greenheck’s solution.

  • Does Your HVLS Fan Perform As Advertised?

    High volume, low speed (HVLS) fans are large diameter ceiling fans that have gained significant popularity in the HVAC industry over the last several years. Like your ceiling fan at home, HVLS fans are a great way to circulate air and make the places that we live and work more comfortable. But, unli

  • Fire Dampers 101 – Types, Testing, and Ratings

    Fire dampers play a very important role in protecting buildings and saving lives in the event of a fire. Building codes require fire dampers to maintain the fire-resistance ratings of walls, partitions, and floors when penetrated by air ducts and transfer openings. (Figure 1) Upon detection of eleva

  • How to Adjust Air Performance in the Field without Sheave Changes or VFDs on Adjustable Blade Fans

    Air performance adjustments in the field are sometimes necessary for a variety of reasons. For example, the system’s design looks perfect on paper, but the realities of installation can require airflow changes. Other factors include unaccounted or overestimated pressures, or building renovations. It

  • The Energy Savings Revolution in Make-up Air

    A mechanical ventilation system provides fresh, outdoor air, as well as heating and cooling to the space in most commercial buildings. The system design varies depending on the application and uses various components such as air-handlers, make-up air units, and energy-recovery ventilators. Each prod

  • Understanding LODs and its Use in Building Information Modeling

    Building information modeling (BIM) in its most simplistic form is all about data; specifically, the data contained in individual BIM elements. These elements – e.g., walls, windows, doors, fixtures, etc. – are the building blocks of any building information model, and can each contain information t

  • Improved Thermal Comfort and Aesthetics Make the Journey Enjoyable

    TBD Central Wisconsin Airport in Mosinee, Wisconsin serves as a gateway for leisure and business travel. More than 280,000 people use the airport annually. Read about Greenheck’s solution to improve thermal comfort with using stylish fans that complements the airport’s newly remodeled concourse.

  • How to Design Laboratory Ventilation

    The COVID-19 pandemic exposed the need for more information in fighting contagious diseases. Research on its causes, controls and cures spiked and continue still as the world attempts to protect against such viruses. Of course, laboratories work on a variety of projects in addition to contagious dis

  • Protecting Ventilation Openings for Storm Shelters and Tornado Safe Rooms; FEMA Louver Requirements

    Springtime in many parts of North America ushers in many changes. Snow melts, temperatures rise and the land starts producing again. These are welcome changes for many, but these changes do not come without some challenges. Spring is a volatile season and is often known for violent weather. Tornadoe

  • Understanding the Differences Between Backdraft and Relief Dampers – Application and Selection

    A successful HVAC system installation requires the correct components. Selecting most components is pretty simple. However, some can create problems. Backdraft and relief dampers, because of subtle differences and uses, can fall into that category. (Figure 1) Figure 1 Backdraft dampers, also known a

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