Backward Curved Centrifugal Blowers & Types | AS Engineers

Backward curved centrifugal fan is commonly used in various industrial and commercial applications. These fans have backward-curved blades designed to move air in a radial direction. They offer high efficiency and low noise levels, making them suitable for various settings.

One of the primary applications of AS Engineers’ backward curved centrifugal fans is in HVAC systems. These fans effectively move air through ductwork in commercial and industrial buildings, providing ventilation and air conditioning. They are also employed in exhaust systems to eliminate contaminated air from a building. Additionally, AS Engineers’ backward curved centrifugal fans are widely used in industrial processes such as furnace and oven systems, cooling towers, and other process cooling applications.

We offer various types of backward curved centrifugal fans, each with distinct features and capabilities. These include:

1. Direct drive backwards curved centrifugal fan: An electric motor drives this type of fan directly, without using a belt or pulley system between the engine and the fan, resulting in a more efficient and reliable operation.The high efficiency of a direct drive backwards curved centrifugal fan is one of its main advantages. It operates with minimal energy loss due to the absence of a belt or pulley system, allowing for improved efficiency. Moreover, direct drive fans have a longer lifespan and require less maintenance than belt drive fans.
2. Belt drive backwards curved centrifugal fan: This type of fan causes air movement through a belt and pulley system. It finds extensive use in larger industrial applications that require high airflow. It proves beneficial when direct drive fans cannot meet the application’s power requirements.The belt drive system enables precise control over the fan’s speed and airflow, making it suitable for applications that demand accurate airflow regulation. Moreover, the belt and pulley mechanism offers a mechanical advantage, allowing the use of a smaller motor. This, in turn, reduces energy consumption and cost.

   One of the primary advantages of belt drive backwards curved centrifugal fans is their superior reliability compared to direct drive fans. The belt and pulley system acts as a mechanical buffer between the motor and the fan, reducing the risk of damage to either component. These fans are also easy to maintain as the belt can be replaced without disassembling the entire fan.

   Furthermore, belt drive backwards curved centrifugal fans are typically more durable than direct drive fans since they are not subject to the same level of wear and tear. The belt and pulley system serves as a mechanical buffer, minimizing the likelihood of damage to the fan or motor.

   Another benefit of belt drive backwards curved centrifugal fans is their lower noise levels than direct drive fans. The belt and pulley system helps absorb some of the noise generated by the fan, resulting in reduced overall noise output. Additionally, the belt drive system allows for easy maintenance as the belt can be replaced without disassembling the entire fan.

1. Variable speed backward curved centrifugal fan: This type of fan incorporates a variable speed drive, enabling precise control over airflow. It finds widespread use in applications that require accurate airflow management, such as HVAC systems, industrial processes, and various settings.One of the primary advantages of a variable speed backward curved centrifugal fan is its capability to tailor airflow to specific requirements of the application. This feature enhances energy efficiency as the fan can operate at lower speeds when less airflow is necessary, and at higher speeds when increased airflow is needed. Furthermore, this flexibility aids in reducing noise levels since the fan can be operated at lower speeds when noise reduction is a concern.

   Another advantage of a variable speed backward curved centrifugal fan is its rapid response to system changes. For instance, in HVAC systems, a variable-speed fan can swiftly adapt to fluctuations in room temperature by adjusting the airflow to maintain the desired temperature. In industrial processes, a variable-speed fan can promptly respond to changes by adjusting the airflow as required to maintain the desired process conditions.

Several different types of variable speed drives are available for variable speed backward curved centrifugal fans. Some of the most common types include:

1.) AC variable frequency drives (VFDs): This variable speed drive uses AC power to control the fan’s speed.

2.) DC variable speed drives: This variable speed drive uses DC power to control the fan’s speed.

3.) Servo variable speed drives: This variable speed drive uses a servo motor to control the fan’s speed.

A variable speed backward curved centrifugal fan offers versatility and reliability for various industrial and commercial applications. It adjusts the airflow to meet specific application requirements and responds quickly to system changes, making it suitable for use in HVAC systems, industrial processes, and other applications that demand precise airflow control. Furthermore, the availability of various variable speed drives enables the selection of the perfect fan for specific needs.

4.) Plug fan backward curved centrifugal fan: This type of fan, also known as a plug fan, is designed to be mounted directly into a duct. This fan is characterized by its backwards-curved blades, which provide high efficiency and low noise levels. The plug fan design allows easy installation and maintenance, making it a popular choice for HVAC and industrial applications.

The plug fan backwards curved centrifugal fan spins a set of backwards-curved blades at high speeds to create a centrifugal force that moves air in a radial direction. The backwards-curved design of the blades increases efficiency and maintains low noise levels, making it suitable for various settings.

An electric motor powers the plug fan backward curved centrifugal fan, driving the blades at high speeds. Various means, including variable frequency drives and speed controllers, control the fan for precise airflow management, which is advantageous in applications requiring precise airflow control.

One of the main benefits of the plug fan backward curved centrifugal fan is its easy installation and maintenance. Users can mount the fan directly into a duct, eliminating the need for additional ductwork or support structure. Furthermore, the fan disassembles easily for cleaning and maintenance purposes.

5.) Airfoil backward curved centrifugal fan: This type of fan utilizes airfoil blades designed to provide higher efficiency and lower noise levels. Users commonly use this fan in HVAC systems, industrial processes, and other applications that require air movement while prioritizing noise reduction.

The airfoil blades of an airfoil backward curved centrifugal fan aim to decrease turbulence and minimize generated noise. We shape the blades to ensure smooth and consistent airflow, reducing noise from turbulent airflow. Moreover, the airfoil design of the blades enables enhanced efficiency as they move more air with less energy.

Airfoil backward curved centrifugal fans typically offer direct or belt drive models that can be equipped with variable speed drives to facilitate precise airflow control. People frequently use these fans in commercial and industrial settings, such as HVAC systems, industrial processes, and cooling towers. They are also well-suited for environments like data centers, server rooms, and other noise-sensitive applications.

Process cooling applications also employ airfoil backward curved centrifugal fans when precise airflow control is required. These fans are particularly beneficial in noise-sensitive environments and situations demanding high efficiencies, such as laboratory and cleanroom settings.

Professionals prefer airfoil backward curved centrifugal fans because they provide high efficiency and low noise levels. They are relatively easy to maintain, as they possess few moving parts, making them a cost-effective choice for numerous applications.

Overall, AS Engineers’ backward-curved centrifugal fans are versatile and reliable for various industrial and commercial applications. Their high efficiency and low noise levels make them well-suited for use in HVAC systems, industrial processes, and other applications requiring air movement. Additionally, the variety of types available allows professionals to choose the perfect fan for specific needs. Direct drive, belt drive, variable speed, plug fan, and airfoil backward curved centrifugal fans offer unique benefits and are popular choices.