Bifurcated Axial Flow Fans: A Comprehensive Guide

Bifurcated axial flow fans, commonly called BIF fans or Biffs and, in some cases, (quite comically) bifuricated fans, play a crucial role in various industrial and commercial settings. These fans are uniquely designed to ensure efficient air movement while protecting the motor from harsh environments. This guide delves into the world of bifurcated fans, exploring their design, applications, and benefits.

What are Bifurcated Axial Fans?

Conical design bifurcated fan. full airflow.

Overview of Bifurcated Fans

Bifurcated fans feature a distinct design where the motor is positioned outside the airflow. This separation is achieved through a bifurcation in the fan casing, allowing air to flow around the motor chamber. Such a design is particularly beneficial in environments where the air contains corrosive elements, steam, grease, hazardous gases and high temperatures.

Types of Bifurcated Fans

Bifurcated fans are available in two main types: conical and cylindrical. These both cater to different airflow requirements and space constraints, offering flexibility in application. However, the conical design allows full airflow, whereas a cylindrical design has a slightly restricted airflow.

Features and Benefits of Bifurcated Axial Fans

Cylindrical Style Bifurcated Fan. Restricted airflow

High-Temperature Tolerance

One of the primary advantages of bifurcated fans is their ability to operate in high-temperature conditions, with some models handling air up to 200⁰C+. This makes them ideal for use in Industrial kitchen extraction, such as food factories and industrial processes—spray booth applications.

Durable Construction

The fans’ impellers are typically made from high-quality die-cast aluminium, glass-reinforced polypropylene or glass-reinforced nylon, depending on the application (as an example, where the temperature is below 150degC, but there’s a corrosive solution in the atmosphere, GRN or GRP blades would be used) and are dynamically balanced for optimal performance. Additionally, the casings are often made from galvanised steel, enhancing their corrosion resistance, but are also available in stainless steel and plastic. 

Motor Protection and Longevity

Since the motor is isolated from hot or corrosive air, it tends to have a longer lifespan. The external air cools the motor, reducing wear and tear from extreme conditions.

Applications of Bifurcated Axial Flow Fans

Bifurcated axial flow fans find their use in a variety of settings, including but not limited to:

• Commercial Kitchen Ventilation: They are often used in industrial kitchens such as food factories for efficient and safe extraction of hot air and cooking fumes. Ideally, they should be used in commercial kitchens, too! But there are many other suitable fans for commercial applications available, too.
• Industrial Spray Booths: In spray booths, particularly those dealing with corrosive materials, bifurcated fans are essential for maintaining a safe working environment. If the spray booth uses Cellulose paint, there will also be the need for an ATEX-rated bifurcated fan depending on Zone and Category.
• Heavy Industrial Settings: Their robust design makes them suitable for heavy industrial applications where air might contain small abrasive or corrosive elements.

Frequently Asked Questions

Q1: Can bifurcated fans be used in outdoor settings?

A1: Bifurcated fans are weather-resistant and, in most cases, at least IP55 and can, therefore, be used in external applications.

Q2: Are there different sizes available for bifurcated axial fans?

A2: Yes, these fans come in various sizes, from 150mm to 1200mm in diameter, to suit different industrial needs. At Beatson Fans & Motors we hold 150mm to 630mm on the shelf!

Q3: How does the bifurcated design benefit the motor?

A3: The bifurcated design protects the motor from hot or corrosive air, prolonging its life and reducing maintenance needs, compared to a standard long-cased or short-cased axial fan. 

Q4: Can bifurcated fans handle abrasive air conditions?

A4: Absolutely; these fans are designed to withstand abrasive conditions, making them ideal for environments with particulate matter or other abrasive elements.

Q5: Are custom designs available for specific applications?

A5: Yes, custom axial fans can be designed to meet specific requirements regarding size, airflow, and environmental conditions.

Q6: How do bifurcated fans contribute to energy efficiency?

A6: By protecting the motor from extreme conditions, bifurcated fans often require less maintenance than standard axial fans and can have a longer lifespan, contributing to overall energy efficiency in industrial systems. 

Conclusion

Bifurcated axial flow fans are vital in many industrial and commercial environments. Their unique design offers significant advantages, including high-temperature tolerance, durability, and motor protection. Understanding these fans’ features and applications can help make informed decisions for ventilation solutions in challenging environments.

Feel free to contact us for more information on Bifurcated Fans or to view a selection of top-quality fans suited to your industrial requirements. We are committed to helping you achieve optimal ventilation and airflow in your industrial setting. Call: 0114 2449955,  email: [email protected] or complete our contact form below