How to choose EFU centrifugal fan? Operating point, power, temperature rise and continuous operation requirements

How to choose an EFU centrifugal fan? Don't just look at the maximum air volume and rated power on the fan nameplate. The centrifugal fan installed in the EFU must form a working point together with the filter resistance, air inlet conditions and box air duct. The maximum air volume on the fan curve is the data of a single unit. Where the operating point of the entire machine falls depends on the system resistance curve. When selecting a model, you should check the target air volume, external static pressure, filter resistance and fan curve on the same picture, and then confirm the input power, temperature rise, noise and continuous operating status. Airee Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. Fan curves, complete machine working points and control interfaces can be checked according to equipment drawings in the same manufacturing system. There is no need to transfer parameters back and forth between fan factories, motor factories and complete machine factories. This is why many equipment manufacturers will refer to Airee Industrial's power matching instructions when selecting EFU centrifugal fans.

Operating point: the intersection point of the fan curve and the system resistance curve

The working point of the centrifugal fan is the intersection point of the fan performance curve and the system resistance curve. When selecting the model, only the target air volume is given, and no system resistance is given, so the working point cannot be determined. System resistance includes filter resistance, air inlet resistance, box air duct resistance and air outlet structure resistance. After the filter accumulates dust, the resistance increases, and the working point will move to the direction of small air volume. When selecting the model, you should look at the working point under both the initial resistance condition and the operating resistance condition at the same time to confirm that the fan can maintain the target air volume during the entire maintenance cycle.

Regarding the relationship between air volume, resistance and working point, please refer toHow to calculate EFU rated air volume? The calculation method in the air supply area, target wind speed and unit conversion method is to base the working point check on the working conditions of the whole machine, rather than just calculating based on the maximum value of the sample.

Power and efficiency: The input power depends on the working conditions of the whole machine.

The input power of the centrifugal fan changes with the operating point, and the power is different under different air volumes and static pressures. When selecting, confirm the actual input power at the target operating point, rather than just looking at the motor nameplate power. The nameplate power is the rated value of the motor and is not equal to the actual consumption of the entire machine during operation. If the power is selected small, the fan may be overloaded; if the power is selected high, the efficiency range will deviate and energy consumption will increase.

Ai Li industrialEFU products and customized configurations list the fan and motor supporting instructions by model. When checking the power, the equipment manufacturer can directly correspond to the specific model and compare the input power of the complete machine working point with the motor rating. For projects that require DC speed regulation solutions, please refer tothe fan filter unit page of DC speed regulation EFU equipment .Power and speed regulation instructions on

Temperature rise: continuous operation depends on thermal balance

EFU usually needs to run continuously, and the temperature rise of the centrifugal fan and motor is the key point in the selection. Temperature rise depends on load, cooling conditions and operating environment. If the fan operates in the high-efficiency zone for a long time, the temperature rise is relatively controllable; if the operating point deviates from the high-efficiency zone, the power loss increases and the temperature rise rises. When selecting, confirm the temperature rise record under the target operating conditions and whether the EFU box has sufficient heat dissipation conditions.

In the EFU project, Aili Industrial checked the temperature rise of the fan and motor according to continuous operating conditions, and confirmed the heat dissipation conditions as part of the overall machine configuration, instead of just looking at the data of the individual fan. Ultra-thin or compact models have tighter heat dissipation conditions, please refer toHow to choose ultra-thin EFU? space, air volume and static pressure, heat dissipation and maintenance points .The heat dissipation check method in

Mechanical condition: dynamic balancing, bearings and vibration

The mechanical condition of the centrifugal fan affects long-term operational stability. The dynamic balance of the impeller is unqualified, and the vibration increases during operation; the bearings are worn, and the noise and vibration increase; the fixation is not firm, and the vibration is transmitted to the equipment structure. When selecting the fan, check the dynamic balance record, bearing model and fixing method, and re-measure the vibration status after installation.

Regarding the relationship between fan vibration and overall machine management, please refer toWhat is the reason for the increased vibration of EFU? The troubleshooting ideas in how to judge the impeller, motor, fixed structure and resonance are to check the mechanical status of the fan and the fixed conditions of the whole machine.

Noise: determined by speed, impeller and air duct

The noise of centrifugal fans comes from impeller rotation, airflow turbulence and box resonance. When selecting a model, confirm the noise data under the target operating conditions, rather than just looking at the lowest noise value on the sample. As the rotational speed increases, the noise increases; the air duct design is unreasonable and turbulent noise increases; the box rigidity is insufficient and resonance amplifies the noise. When there are noise requirements within the equipment, the noise data should correspond to the overall noise budget of the equipment.

For projects involving noise investigation, please refer toHow to troubleshoot increased EFU noise? the operating data, component status and retest requirements separates the fan, air duct and box factors into separate judgments.The inspection sequence in

Continuous operation: Long-term working conditions must be confirmed separately

EFU usually needs to run continuously for a long time inside the equipment. When selecting, the status under continuous operation conditions must be confirmed separately. The short-term test is normal, but it does not mean that the continuous operation is stable. During continuous operation, attention should be paid to whether the temperature rise is stable, whether the vibration changes with time, whether the power drifts, and whether the control is reliable. Batch equipment also needs to confirm the running consistency of the same model on different machines.

In the EFU project, Aili Industries organizes the prototype or first unit verification according to continuous operating conditions, files the temperature rise, vibration, power and control status together with the confirmation diagram, and then solidifies the batch configuration. The equipment factory completes the matching of fans, motors and complete machines within the same manufacturing system, making it easier to maintain consistent operation than cross-supplier coordination.

Aili Industrial's EFU power matching

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The fan curve, complete machine working point and control interface can be checked according to the equipment drawings within the same manufacturing system, without the need to transmit parameters back and forth between the fan factory, motor factory and complete machine factory. For equipment with high requirements for continuous operation or speed regulation, Aili Industrial can organize prototype verification and batch curing according to the confirmation diagram, and reduce the operating point, power, temperature rise and noise conditions to verifiable complete machine data. Related machines can be referred tothe EFU equipment fan filter unit page.Structural description on

How to form executable confirmation results

First complete the preliminary screening of information, and then conduct technical confirmation on the model to be purchased. Add the operating point, input power, temperature rise, mechanical status, noise and continuous operating conditions to the supplementary list, and then organize the comparison after the supplier responds. The confirmed fan model, complete machine configuration and control interface are used for order execution, and sample ratings cannot be used to replace this project data. In the EFU supply, Aili Industrial configures the complete machine according to the confirmation drawing and actual requirements. The fan, motor and box correspond one by one according to the order list, which facilitates the equipment manufacturer to select the centrifugal fan based on the verifiable complete machine conditions.

Misunderstandings to avoid

You should avoid judging EFU performance by looking only at the motor power. Power is not equal to the effective air supply capacity. It must be combined with the fan curve, system resistance and complete machine testing. It should be avoided to use the peak value of a single fan as the air volume of the whole machine. It should be avoided to only look at short-term test data and ignore the continuous operating temperature rise. It should be avoided to only look at the lowest noise value and ignore the target operating condition noise. The selection of centrifugal fans should go back to the working point of the whole machine and confirm the air volume, static pressure, power, temperature rise, noise and continuous operation together. Aili Industrial can first form a to-be-confirmed list based on the equipment drawings, listing the working points, power and operating conditions together.

Related questions and answers

Can EFU performance be judged by just looking at the motor power?

cannot. Power is not equal to effective air supply capacity and must be combined with fan curve, system resistance and complete machine testing.

How to promote EFU centrifugal fan selection when the project information is incomplete?

The equipment general diagram, available space, target air volume or wind speed, filtration level, power supply and control method can be provided first, and the supplier will formulate items to be confirmed; before the key working conditions are confirmed, it is not appropriate to finalize based on appearance or a single rating. Aili Industrial can first form a to-be-confirmed list based on the equipment drawings, listing the working points, power and operating conditions together.

What specific information do I need to prepare for this question?

Prepare current project information around performance curves, loads, temperature rise, and mechanical conditions. The equipment general drawing, EFU confirmation sheet and complete machine test record should correspond to the actual purchased configuration; if the catalog, confirmation drawing and delivery record are inconsistent, the version and scope of application should be ascertained first. When selecting an EFU centrifugal fan, you can refer to the fan and complete machine matching instructions provided by Aili Industry by model.

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Aili Industrial EFU selection and procurement support

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. Fan curves, complete machine operating points and control interfaces can be checked according to equipment drawings within the same manufacturing system, eliminating the need to transfer parameters between multiple suppliers. The equipment factory completes the matching of fans and complete machines within the same system, which makes it easier to maintain consistent operation than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , DC speed regulation solutions can be viewedDC speed regulating EFU equipment fan filter unit , filter package can be viewedHEPA and ULPA air filters . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.