Frequently asked questions about HVLS fans(large industrial/commercial/PMSM fans) and air coolers with explanatory links.

What are HVLS fans?

You might have heard a lot about HVLS fans, but what are HVLS fans? These fans are very common in large spaces. You will find them at shopping malls, factorieswarehouses, restaurants, dairy barns, libraries, etc. There is no doubt that these fans are common, and we see them in many places. They are excellent for large spaces. Therefore, people prefer them and install them. You might be thinking about why these fans are called HVLS fans and why they are different from the fans that we use in our homes. We are going to discuss everything about HVLS fans in detail.

What are HVLS fans? HVLS stands for High Volume Low Speed. So, HVLS fans provide a high volume of air at a very low speed. They run at low speed, but they direct a high volume of air in the area. High volume at low speed is the specialty of these fans that make them different from other fans. The fans that we use at our home provide air at a very high speed. But still, the air volume of a normal residential fan is much less than an HVLS fan.

Reasons Behind High Volume at a Low Speed

You might be thinking that it is not possible to get a high volume of air at a low speed. But this is possible. The reasons behind high volume are the aerodynamic design and the large size of the fan. The fans are specially designed for large spaces. They have special blades that are placed in a specific manner on the fan. This enables the fan to ventilate a large area while running at a very low speed.

These fans have large fan blades and the number of blades is almost twice the fan that you use at your home. There can be 6 blades or more in an HVLS fan. Moreover, the diameter of the fan can be up to 7.3m/24ft. These fans can be mounted on walls and ceilings according to the place and use.

Features of HVLS Fans

There are unique features of HVLS fans that enable them to serve a large area without any hassle. Let’s get into the details of their features.

Size of HVLS Fans

HVLS fans are quite large as compared to residential fans. The diameter of these fans can be in the range of 2.8m (8ft) to 7.3m (24ft). Now you can imagine how large these fans are. Due to their large size, they can even provide a high volume of air at a very low speed. You can choose the size of the fan according to the area where you want to install them.

HVLS fans can work in industrial and commercial places. The only difference is the size. Commercial fans are a little smaller than Industrial fans. RTFANS make commercial and industrial fans in a wide range of sizes. The size of RTFANS commercial fans ranges from 2.8m to 4m (8ft to 14ft). In contrast, the size of industrial fans ranges from 3.7m to 7.3m (12ft to 24ft). If you are not sure about the size, then you can contact us. We will tell you the right size according to the area.


The blades of HVLS fans are not like simple residential fans. They are made according to aerodynamic principles to offer a high airflow. They are called airfoil blades, having a special shape and design. These blades are made from special alloys to offer maximum durability. The number of blades is also an important matter. The airflow of the fan depends on the number of blades it has. They usually have 6 to 8 blades depending on the manufacturer.

RTFANS have contributed a lot to the betterment of the HVLS fans. Our research teams have tried a different number of blades to achieve maximum performance. Finally, they have reached to the conclusion and placed six blades in all fans.


We told you that HVLS fans run at a low speed as compared to residential fans. The speed of the fans ranges from 50-100 RPM depending on the size and type of the fan. They run at this speed but provide a high volume of air.

High Airflow of HVLS fans

The reason due to which HVLS fans are common is the high airflow. Due to high airflow, a single fan serves a large area up to 1800 square meters. This is the reason that a few HVLS fans can cover a large area. They have large blades with an aerodynamic design that pushes the air. The airflow of these fans ranges from 4,500 to 15,000 cubic meters per minute.

Due to this high airflow, HVLS fans can improve the air quality of the area. They can decrease the relative humidity and provide a cooling effect. The cooling effect makes people feel cooler up to 5-8˚C. This is also known as the chill effect. These fans can make the people in the area comfortable and fresh. Most importantly, the well-aligned breeze of the fan reaches every corner of the area that is impossible with wall-mounted and small ceiling fans.

Low Cost of Ventilation​

HVLS fans are excellent to ventilate a large area at a very low cost. They are relatively cost-effective as compared to small ceiling fans, wall-mounted fans, and HVAC systems. You only need to install a few units in a large area, so there is a very low running cost. The fans can also help to spread the cool air of air conditioners in a large area. They can also reduce the cost of the HVAC system; you can lower the set point of the air conditioner to a few degrees and save energy.

RTFANS is a well-known and reputable manufacturer of HVLS fans in China. We have a wide range of commercial and residential HVLS fans. We have also introduced our new technology of PMSM fans in the market that has better airflow, and they can act in a very large area. If you want to install HVLS fans, then our team representatives can guide you in selecting the right size for your area. For more information, quote, or questions, feel free to contact us.

We aim to be a world-leading solution supplier specialized in large space ventilation and cooling. join us to develop more and help our earth to be greener.
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