4 Advice to Choose a HVLS Fans

Good quality HVLS ceiling fans: Four important factors to consider before making a purchase

High-flow, low-speed (HVLS) ceiling fans have become the standard for low-cost, high-efficiency climate control in many commercial and industrial applications. However, not all HVLS Fans are created equal. There are many important design and manufacturing variations that can impact everything from air movement quality, to operating and maintenance costs. When researching for a good quality HVLS fan, there are four main areas to consider, including: propeller design, hub and structural systems, safety features, and on-site consultation. All four of these factors must be properly tested to select the right HVLS fan for a particular application.
As the name suggests, HVLS fans move large amounts of air from the ceiling to the floor of the factory. This controlled airflow ' ceiling to floor ' creates a more comfortable and productive work environment, and helps businesses control their energy costs. Improved airflow means improved temperature control throughout the year, which ultimately saves on electricity bills. Many businesses ' from distribution centers, manufacturing facilities' and farms, to shopping malls, schools, restaurants, churches' and gyms ' are choosing to install HVLS fans. HVLS fans are rapidly replacing outdated high-speed fans that are noisy, less efficient, and can take up large floor space. Businesses looking to install  good quality HVLS ceiling fans into their facility should understand that not all HVLS fans are created equal. There are four main factors to consider:

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1. BLADE DESIGN OF GOOD QUALITY HVLS CEILING FANS:

The outstanding benefit of an HVLS fan is the amount of air produced, which is generated by a large diameter propeller that can extend up to 24 feet. However, the large fan diameter is only part of the design. Each propeller must be able to move air efficiently, otherwise energy will be wasted. Propeller designs vary by manufacturer, so it is important to come up with a design that produces uniform pressure and velocity from the center to the tip of the propeller. The lack of pressure and/or uneven velocity will create a number of problems, including backflow and increased energy consumption. Also, it is important to consider the angle of the blade as it relates to the plane of rotation. The overall shape and design of the blades is what generates the maximum amount of air ' not the number of blades. Greentec impellers have an enhanced contoured shape that produces consistent airflow over the entire length of the blades.

2. HUB AND STRUCTURE OF GOOD QUALITY HVLS CEILING FANS:

The design and construction of the propeller is very important; however, it is equally important to consider the way the propeller is mounted and the overall structure of the hub construction. A tight, solid connection between the impeller and the rim is extremely important. Similar to helicopter blades, Greentec's propellers are attached to the rim by a load-bearing blade arm. All Greentec bladearms and balades are 'rotationally balanced' at the factory and will never need adjustment. This ensures smooth and balanced operation throughout the life of the fan. Most manufacturers of HVLS fans use die castings, which are created by pouring molten aluminum into a mold. It is difficult to adjust the consistency of castings due to differences in materials and manufacturing processes. As a result, cast hubs are more porous and prone to cracking. Greentec uses a milled aluminum hub that is much more durable than a traditional die-cast hub. A computer controlled milling machine is used to remove materials from an aluminum block. This process produces a rim that is more durable and reliable when compared to a cast rim.

Structure of Greentec HVLS ceiling fan

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3. SAFETY OF GOOD QUALITY HVLS CEILING FANS:

Safety is always an important factor to consider when purchasing industrial equipment. Businesses should look for HVLS fans that provide a secure connection from the motor, fan structure to installation. The fan plate is first attached to the motor using reverse threaded bolts and has a taper locking pin. Second, an anti-drop safety ring to secure the connection between the engine and the wheel. And finally, each propeller is attached to a safety ring to ensure the blades stay together as one unit. These three features work together to help ensure the safety of those under and around the fan.

4. DIRECT CONSULTATION:

Before purchasing an HVLS fan, customers should speak to an expert who can analyze a specific application. A consultant will look at things like the size and operations of the plant; the amount of open and limited space in a facility; existing HVAC systems and more. The goal is to choose the right fan size and achieve the desired airspeed with a specific floor plan. Greentec offers a wide range of good quality HVLS fans and can recommend the most suitable solution for a particular application. HVLS fans are commonly found in industrial environments such as distribution centers and manufacturing facilities, farms' however, they are becoming more common in sports facilities, theatres, churches, homes. stores, malls, and other environments where air movement is critical.

HVLS FANS: Four important factors to consider prior to making a purchase decision March WHITE PAPER ".. .NOT ALL HVLS FANS ARE CREATED EQUAL ." THE NEW STANDARD HIGH-VOLUME, LOW-SPEED (HVLS) FANS HAVE BECOME THE STANDARD FOR LOW-COST, HIGH- EFFICIENCY CLIMATE CONTROL IN A WIDE VARIETY OF COMMERCIAL AND INDUSTRIAL APPLICATIONS. As the name suggests, HVLS fans move large volumes of air down from the ceiling and across the floor of a building. This controlled flow of air ' from ceiling to floor ' creates a more comfortable and productive work environment, while helping businesses control their energy costs. Improved air flow translates to improved temperature control throughout the year, which ultimately saves money. A wide variety of businesses ' from distribution centers and manufacturing facilities, to shopping malls and gyms ' are choosing to install HVLS fans. HVLS fans are quickly replacing antiquated high-speed fans that are noisy, less- efficient and can take up valuable floor space. Businesses that are looking to integrate HVLS fans into their facilities should understand that not all HVLS fans are created equal. There are significant design and manufacturing variations that can impact everything from the quality of air movement, right down to the cost of operation and maintenance. When researching HVLS fans, there are four key areas for consideration: Blade Design Hub and Mounting Safety On-site Consultation 1HVLS fans improve airflow by drawing air down from the ceiling and across the floor. This helps to improve climate control and energy efficiency. Rite-Hite fan blades are seated on the hub arm and locked into position with a machined bolt. In addition, the hubs and blades are rotationally- balanced and never require adjustment. Rite-Hite, a leading manufacturer of HVLS fans, constructs its blades from strong, light-weight aluminum. This produces a more stable blade that maximizes air movement directly underneath the fan. In addition, Rite-Hite fan blades have an advanced, contoured shape (tilt, taper and twist) that produces consistent airflow across the entire length of the blade. This unique fan blade design produces the most air, over the largest area, at the lowest cost when compared to competitive HVLS fans. 2. HUB AND MOUNTING SYSTEM The design and construction of the fan blade is important; however, it's equally important to look at how the fan blade is mounted and the overall construction of the hub. A tight, solid connection between the blade and hub is critically important. Similar to the blades of a helicopter, Rite-Hite's fan blades are attached to the hub by a pivot. The pivot is surrounded by a resilient, vibration-absorbing material, which eases the stress transferred to the hub and drive during operation. When compared to fans with rigidly- mounted blades, Rite- Hite blades can reduce stress to the hub and drive by upwards of 50 percent, which substantially increases the life of the drive mechanism. 1. BLADE DESIGN The signature benefit of an HVLS fan is the production of air volume, which is created by a large diameter fan blade that can span up to 24 feet. A large fan diameter, however, is only part of the equation. Each blade must be capable of efficiently moving air or the result will be wasted energy. Fan blade design varies by manufacturer, so it is important to look for a design that produces uniform pressure and velocity from the hub to the tip of the blade. A lack of uniform pressure and/or velocity creates a number of issues, including backflow and increased energy consumption. To maximize performance, look for a tapered blade design that is narrow at the tip, where the blade velocity is higher, and widens toward the hub, where more blade area is required due to lower blade velocity. Also, it is important to look at the angle of the blade as it relates to the plane of rotation. The chord angle of the blade should be minimal at the tip and gradually increase as it gets closer to the hub. The overall shape and design of a fan blade is what produces maximum air volume ' not the number of blades. Certain HVLS fans struggle to produce consistent air movement because they are made from extruded aluminum. With extruded blades, the shape or blade angle is uniform from root to tip, or in other words, there is no blade twist. With this type of design, there is limited or no air movement directly underneath the fan center. This is a result of the blade tip moving most of the airflow and the blade root producing limited airflow. As a result, some manufacturers add blades to help compensate, which adds cost to the fan without increasing performance or value. 2 Rite-Hite fan blades have an advance, contoured shape (tilt, taper and twist) that produces consistent airflow across the entire length of the blade. 3To schedule an onsite analysis by an HVLS professional, call Rite-Hite at 888-841- or visit www.ritehite.com to learn more. Some HVLS fans specify clearances or distances from other fans or HVAC equipment. Competing air currents can damage fans that are unable to absorb the forces created by lift or air pressure. To ensure a tight connection, Rite-Hite fan blades are mounted in two specific ways. They are seated on the hub arm and then locked into position with a machined bolt that requires a torque setting. In addition, all Rite-Hite hubs and blades are 'rotationally-balanced' at the factory and will never require adjustment. This ensures smooth and balanced operation over the lifetime of the fan. Most HVLS fan manufacturers use a cast hub, which is created by pouring molten aluminum into a mold. It is difficult to regulate the consistency of a casting due to variances in the materials and manufacturing process. As a result, cast hubs are more porous and susceptible to cracking. Rite-Hite uses a milled aluminum hub that is much stronger than a traditional cast hub. A computer- controlled milling machine is used to remove materials from a block of aluminum. This process produces a more durable and reliable hub when compared to a cast hub. 3. SAFETY Safety is always an important consideration when purchasing a piece of industrial equipment. Businesses should look for HVLS fans that offer a three-way motor-to- hub safety connection. First, look for a hub that attaches to the motor using a reverse thread bolt and tapered aluminum bushing. Second, look for a safety ring that backs up the motor to hub connection. And finally, each blade arm should be attached to the safety ring. These three features, working together, help to ensure the safety of people underneath and around the fan. 4. ON-SITE CONSULTATION Prior to purchasing HVLS fans, companies should to talk with a professional who can analyze a specific application. A consultant will look at things like building size and operation; the amount of open and confined spaces within a facility; existing HVAC systems and more. The goal is to match the right size fan and desired air speed to a specific floor plan. Rite-Hite offers a wide variety of HVLS fans and can recommend a solution that is best suited for a specific application. HVLS fans are often found in industrial settings like distribution centers and manufacturing facilities, however, they are becoming more common place in athletic facilities, amphitheaters, malls and other environments where air movement is critical. Improved air f low translates to improved temperature control throughout the year, which ult imately saves money.