Depending on your budget and the reason you are seeking to install an industrial fan, there are some fans for the industrial industry to choose from. There are basically two major types of fans used in industries. They are classified as either centrifugal fans or axial fans, which vary in design, functionality and airflow direction.
Here are the 13 different types of fans:
1. Airfoil Fan
This is a highly efficient fan that runs relatively higher than the standard flat blades. Airfoil fans are used in a wide range of industrial applications. An airfoil fan is an ideal choice for airstreams where efficiency is critical. A multi-wing airfoil axial fan may be used in applications such as cooling towers, engine cooling and refrigeration. Airfoil fans may be set out for either blowing or sucking.
These types of fans control air volume by the help of the blades, which have different pitch angles. These types of fans do not consume a lot of power and is not noisy.
2. Backward Curve Fans
These types of fans are almost as efficient as the airfoil fans. They do not allow dust build up due to their single-thickness and curved plate blades. Its deep blades allow adequate expansion along the blades’ passages. The velocity of the air leaving the impeller is lower than the speed at the tip. This fan is often used in high-pressure applications.
3. Backward Inclined Fans
Backward inclined fans have simple backwardly inclined flat blades. This is to minimize interference of air passing through the fan and to match its velocity. It is also cheaper and produces lower sounds than other types of fans. It is typically suited for high-volume, low pressure and clean air applications.
4. Radial Blade Fans
Radial blade fans are rugged with blades arranged in a radial pattern. These types of fans are fitted with liners that are erosion-resistant, hence extending rotor life. It does not require large floor spaces since they have a compact design. They offer high-pressure capabilities and are averagely efficient.
5. Radial Tipped Fans
Their wheels are curved backward but not as much as backward curved fans. Their blades have radial tips and are bent inward, hence the name radial tips. Their degree of curve may also be said to be radial at the tips but slowly tilting towards the direction of rotation. This design for these types of fans is used in high volume flow applications and offer medium efficiency. It is more compact than backward curved, backward inclined, or airfoil fans.
6. Paddle Wheel Fans
Paddlewheel fans feature a shroud-less impeller design, which offers low efficiency. It is ideal for applications with significantly high dust loading. Paddlewheel fans can withstand high-temperature applications.
7. Forward Curve
Of all centrifugal fans, the forward curve fan offers the highest volume flow rate. It also has the advantage of having the smallest physical package. These types of fans are only essential for conveying low dust air since they are highly sensitive to particle build up and have a large number of blades. Typically, they are used in high-temperature furnaces.
8. Pre-engineered Fans
The pre-engineered fans have blades that vary in shape and are only available in standardized sizes. Their delivery times are relatively short and are usually installed in a common housing. To meet the needs of a variety of applications, they have a full range volume and pressure requirements.
9. High-Temperature Axial Fans
These are ideal for operations against low flow aversion in industrial convention furnaces. Their designs may be single or bi-directional and are almost always used in high-temperature furnace applications.
10. Tube Axial Fans
The wheels of the tube axial fan are positioned in cylindrical tubes. They have neither inlet nor outlet dampers. They are modelled to make up for the performance difference between heavy-duty vane axial and the typical duct fans.
11. Vane Axial Fans
Due to the static vanes present, they have a high-pressure capability. Vane axial fans are effective in removing smoke, fumes and heat. These types of fans may also be used in drying processes, comfort and process cooling, and conventional ventilation.
12. Variable Pitch Fans
The blade angles may be changed since they can be manually adjusted. This provides for operation over a wide range of volume and pressure. Efficiency is optimized when the blades are adjusted continuously. This is done by complementing the pitch of the blade to the different conditions for the application.
13. Cooling Fans
Cooling fans usually feature large diameter to allow for low pressure and high volume airflow. They are used in wet mechanical cooling towers, air-cooled steam condensers and heat exchangers, radiators and any other air-cooled application.
Choosing the right industrial fan involves many factors. In most cases, the type of establishment where you need an industrial fan installed dictates the appropriate fan to use. Whichever fan you use will either be a centrifugal or axial fan, which is easily set apart by their functionality, design, and airflow direction.