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How to Purchase a Centrifugal Fan?

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Centrifugal fans are an indispensable tool in many industries, ranging from HVAC systems to industrial air movement. However, with so many options available, choosing the right one can be a daunting task. In this post, we will explore the different types of centrifugal fans and the selection criteria you should consider when buying one.

Centrifugal fan selection criteria

Types of centrifugal fans:

  • Fans can be classified according to impeller form into centrifugal fans, axial fans, mixed-flow fans, tangential blowers, and others.
  • They can also be categorized by installation location or form, such as roof fans, wall-mounted axial flow fans, duct fans, fan case, and more.
  • Fans can also be used for various purposes, such as exhaust fans, supply fans, filter fans, dust removal fans, smoke exhaust fans, and so on.
  • These categories can also be combined, such as roof-mounted centrifugal exhaust fans, wall-mounted axial flow exhaust fans, and mixed-flow smoke exhaust fans.

Centrifugal fan selection criteria:

The most important principle of choosing a fan is to use the air flow reasonably to achieve the required function

Application Requirements:

  1. If there is a need to exhaust heat or steam, it is recommended to prioritize using a roof exhaust fan.
  2. When heating, cooling, or introducing fresh air, it is best to direct the warm or cool air flow towards the work area. Therefore, duct fans or wall-mounted axial fans should be used whenever possible.
  3. For fire smoke exhaust, priority should be given to roof fans or suspended ducts, making duct fans a common choice.
  4. In situations where air layering is required, it is necessary to consider and control the air flow within a certain space or height range. Examples of such scenarios include surgical rooms, bacteria culture rooms, flour filling workshops, canteens, welding workshops, etc. In these scenarios, mixed-flow fans, exhaust fans, or filter fans should be selected whenever possible.
  5. In order to maintain overall cleanliness within the workshop, while also having a few specific areas that produce severe pollution (or excessive heat), local exhaust needs to be implemented. This can be achieved by selecting a new air fan to supply air locally.

Fan Construction Materials:

The materials used in constructing the fan can impact its performance, durability, weight, and cost. For instance, fans made from steel tend to be heavier but are more durable and better suited for rugged or corrosive environments. On the other hand, aluminum fans are lighter and less expensive, making them a good choice for less demanding applications,At the same time,PA66+GF Material of Impeller can reduce fan weight, save transportation costs, and achieve energy saving effect,PA66 has the characteristics of temperature resistance, flame retardant, corrosion resistance, heat insulation, high tensile strength and good electrical insulation,This allows PBM Fan to reach-25℃~+60℃。

Operating Environment:

The operating environment of the fan is another important consideration. The temperature and humidity levels of the space where the fan will operate can affect its performance and lifespan. Some fans are designed to withstand extreme temperatures, while others may require additional cooling measures.

Required Maintenance:

Maintenance requirements should also be factored into the decision-making process. Fans with simple designs and fewer moving parts typically require less maintenance than those with more complex structures. It's important to evaluate the cost and frequency of maintenance to determine the total cost of ownership over the life of the fan.

Regulatory Requirements:

Depending on the application and location, there may be regulatory requirements that must be met when selecting a centrifugal fan. For example, some industries have specific safety regulations related to fan operation and maintenance. It's important to research any applicable regulations and ensure the fan meets the necessary requirements.

Centrifugal fan selection criteria

Cost Considerations:

Finally, cost considerations are an important factor when purchasing a centrifugal fan. The cost of a fan can vary widely depending on its size, construction materials, and features. However, it's important to remember that the initial cost is just one component of the overall cost of ownership.

A fan with higher efficiency may have a higher upfront cost but can result in lower energy costs over time. Additionally, fans with lower maintenance requirements may have a higher upfront cost but can save money on repairs and downtime in the long run.

When considering cost, it's essential to evaluate the fan's lifetime cost and weigh it against the potential benefits in terms of performance and efficiency.

Common parameters (performance indicators) for fans include:

Air flow: volume of air conveyed by the fan per minute (m³/h)

Total pressure: energy possessed by gas, equal to dynamic pressure + static pressure (Pa)

Dynamic pressure: pressure required to accelerate gas from zero velocity to a certain velocity (Pa)

Static pressure: difference between absolute pressure at a point and atmospheric pressure for fluids (Pa)

Fan speed: number of rotations per minute made by the fan impeller (RPM)

Shaft power: actual power transmitted from the motor to the fan shaft, excluding external loss factors. Typically considered as the actual power required by the fan (KW)

Noise: noise generated by aerodynamic and mechanical noise during normal operation of the fan; most manufacturers report dB(A) at 1.0m distance

Overall Pressure Efficiency: Airflow x Total Pressure / Shaft Power / 1000 / 3600 x 100%

Power supply: AC: 380~3, 220~3, 220~1, 110~1, DC: 310, 110, 85, 48, 24, 12, etc.

Outlet wind speed: wind speed at the cross-sectional area of the fan outlet. Controlling the outlet wind speed can indirectly control the noise level (m/s).

Contact Us for Your Centrifugal Fans

Purchasing the right centrifugal fan involves taking multiple factors into account. At PBM, we are a China mainland EC brushless motor manufacturing and technology consulting company that offers an extensive range of EC motors, fans, and intelligent ventilation solutions. Our Campany have 15 years experience and Five Years Warranty for all of our EC fan products;Our products are designed to provide precise and constant air-moving with maintenance-free operation throughout their life cycles. If you are looking for a reliable and energy-efficient centrifugal fan, don't hesitate to contact us today. Our team of experts can help you choose the best solution to meet your specific needs and ensure optimal performance, efficiency, and cost-effectiveness.

A Customer Case of Fan Type Selection:

For example, in 2022, a French customer has a requirement for PBM to provide an underground ventilation system for a winery. When the fan rotates at n=1600rpm, the airflow required is 2.0m³/s with a total pressure of 400Pa, assuming standard intake conditions. The appropriate type of fan should be selected to meet these requirements.

Centrifugal fan selection criteria

We apply the formula to get the final 140.4.

Centrifugal fan selection criteria

Combined with the figure below, it can be concluded that 140.4 is suitable for Axial Fan, and then we chose this axial fan PW3N350B2EP2 from PBM.

Centrifugal fan selection criteria

These are the specification sheets for our PW3N350B2EP2.

Centrifugal fan selection criteria

Centrifugal fan selection criteria

Centrifugal fan selection criteria

Centrifugal fan selection criteria

Centrifugal fan selection criteria

Centrifugal fan selection criteria

Centrifugal fan selection criteria

After three days of production,we completed two prototypes and delivery to place.

Centrifugal fan selection criteria

Welcome to contact us for centrifugal fans. www.pbmmf.com

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