What does the EFU fan do? Position and usage boundaries of equipment-side clean air supply

What does the EFU blower do? You can't just answer 'blowing'. The EFU fan is responsible for pressurizing the whole machine, sending the filtered air from the air inlet to the air outlet, overcoming the filter resistance, air inlet resistance, box air duct resistance and air outlet path resistance, forming a local clean air supply inside the equipment. The scope of action of the fan is the air flow path inside the EFU, not the air flow organization of the entire device. To understand the role of the EFU fan, you need to look at its position in the air path, how it cooperates with the filter, how the power and speed affect the air supply capacity, and what problems are not within the scope of the fan. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The coordination of fans and complete machines can be checked according to equipment drawings within the same manufacturing system. There is no need to transfer parameters back and forth between the fan factory, motor factory and complete machine factory. This is why many equipment manufacturers will refer to Aili Industrial Power Supporting Instructions when understanding the functions of EFU fans and planning and selection.

Position in the air path: Boosting is a central role

EFU fans provide pressurization in the air path. The air enters from the air inlet, passes through the filter, is pressurized by the fan, and is sent out from the air outlet. The position of the fan determines which section of air it pressurizes: the fan is in front of the filter, sucking in the negative pressure section; the fan is after the filter, sending out the positive pressure section. Different structures have different positions and the fans work in different ways.

Regarding the composition and working principle of EFU in the whole machine, please refer toWhat is EFU? The structure, function, working principle and applicable equipment description are explained in the description, and the function of the fan is understood in the air path of the whole machine.

Cooperating with the filter: the fan must overcome the filter resistance

The function of the EFU fan is directly related to the filter. The filter has resistance, and the fan needs to provide enough static pressure to overcome the resistance and deliver the target air volume to the protected area. As the filter level increases, the resistance increases, and the fan operating point shifts toward the direction of smaller air volume; the filter accumulates dust, the resistance increases, and the air volume decreases. The fan and filter are in a cooperative relationship, not independent components. Only confirm the filter level and not the fan residual pressure. The air volume may be insufficient after installation.

Regarding the relationship between the fan operating point and filter resistance, please refer toHow to view the EFU fan performance curve? air volume, static pressure, power and operating point . Interpretation methods in To confirm the initial resistance of the filter, please refer toHow to confirm the initial resistance of EFU filter? rated air volume, test conditions and fan matching .Verification steps for

Power and speed: determine the air supply capacity

The power and speed of the EFU fan determine the air supply capacity. When the rotational speed increases, the air volume and static pressure increase, but the power, noise and temperature rise also increase; when the rotational speed decreases, the air volume decreases and the energy consumption decreases. The power of the fan should cover the target operating point with a margin, and the rotation speed should be set according to the equipment operating gear. If the power or speed does not match, the fan may be overloaded, inefficient or insufficient in air supply.

Regarding the relationship between fan power and operating point, please refer toHow to determine EFU input power? operating point, speed, load and operating time analysis . Analytical methods in For the method of speed setting, please refer toHow to set the EFU fan speed? Calibration of Air Volume, Static Pressure, Noise and Operating Gear .Explanation in

Matching with the box: installation conditions of the fan in the box

The function of the EFU fan also depends on its installation conditions in the box. The fan is not firmly fixed and vibrates during operation; the gap between the fan and the box is unreasonable and the air flow is short-circuited or backflowed; the fan inlet is blocked by the structure and the suction efficiency is reduced. The cooperation between the fan and the box is a key link in whether the fan can play its role.

Regarding the relationship between fan vibration and box structure, please refer toWhat is the reason for the increased vibration of EFU? how to determine impeller, motor, fixed structure and resonance . Troubleshooting ideas on For the verification method of box structure, please refer toHow to design the EFU box? strength, sealing, air inlet and outlet and maintenance points .Instructions on

Boundary of use: Which problems are not within the scope of the fan

To understand the function of the EFU fan, you must also understand which problems are not within the scope of the fan. The overall cleanliness level of the equipment, the pollutants taken away by the process exhaust, the external environment of the equipment, the particles brought in by personnel operations, and the pollution of the air supply path after the filter cannot be solved by the fan alone. The fan is responsible for providing air supply power, and the filter is responsible for intercepting particles. The overall airflow organization of the equipment and the control of external pollution sources require the cooperation of the equipment designer and the system solution.

For the relationship between airflow boundary and protection effect, please refer toWhy does the same air volume produce different cleaning and protection effects? In the instructions, consider the fan's operating range together with the airflow conditions inside the equipment.

Applicable scenarios: Different equipment has different requirements for fans

The scope of action of the EFU fan changes with the equipment scene. Semiconductor front-end equipment focuses on the air supply stability of the wafer path, photolithography equipment focuses on wind speed stability and vibration control, etching equipment also considers the impact of corrosive gases on fans, and SMT placement machines focus on compact space and noise. Different equipment has different requirements for fan power, speed, noise and protection. When selecting, first clarify the equipment scenario and protection area, and then determine the power, speed and control method of the fan.

For EFU configuration methods of different devices, please refer toHow to configure the semiconductor front-end equipment EFU? the key points of clean areas, air volume filtration and equipment interfaces . Area division and interface confirmation ideas in For the wind speed and vibration requirements of lithography equipment, please refer toHow to configure EFU of lithography equipment? how to confirm local cleanliness, air flow stability and space interface .Instructions on

Aili Industrial's EFU fan package

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The coordination between the fan and the complete machine can be checked according to the equipment drawings within the same manufacturing system, and the matching between the fan, motor and box does not need to be passed across suppliers. For equipment with clear requirements for fans, Aili Industrial can organize prototype testing and batch curing according to the confirmation drawing, and put the fan power, speed, operating point and noise conditions into verifiable complete machine data. Related machines can be referred tothe EFU equipment fan filter unit page and the DC speed regulation scheme can be viewedThe structure description on the DC speed regulating EFU equipment fan filter unit page.Control instructions 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 fan position, cooperation with the filter, power speed, cabinet cooperation and usage boundaries 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 parameters 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, filter, box and control correspond one by one according to the order list, which facilitates the equipment manufacturer to understand the function of the fan and settle it on the verifiable complete machine conditions.

Misunderstandings to avoid

It should be avoided to equate EFU fans with ordinary air supply fans. It should be avoided to only confirm the fan power without confirming the filter resistance. It should be avoided to ignore the installation cooperation between the fan and the box. It should be avoided to attribute the overall air flow problem of the equipment to the fan. It should be avoided to ignore the fan noise and temperature rise limits. The function of the EFU fan is to pressurize and supply air, but it is not a universal component to solve all air flow problems. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the fans, filters and complete machine conditions together.

Related questions and answers

Is the EFU equivalent to a regular supply fan?

no. EFU also includes filtration, sealing, structure and control requirements, which should be evaluated according to the operating conditions of the entire machine.

How to promote EFU 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 according to the equipment drawings, listing the fans, filters and complete machine conditions together.

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

Prepare current project information around functional boundaries, rated operating conditions and equipment interfaces. 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 understanding the functions of EFU fans, you can refer to the fan and complete machine matching instructions provided by Aili Industry by model.

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Key points for selection and acceptance inspection

Aili Industrial EFU selection and procurement support

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The coordination between the fan and the complete machine can be checked according to the equipment drawings within the same manufacturing system, and the matching between the fan, motor and box does not need to be passed across suppliers. The equipment factory completes fan selection and complete machine matching within the same system, which is easier to maintain consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , the complete machine structure can be viewedEFU equipment fan filter unit , the control scheme can be viewedDC speed regulating EFU equipment fan filter unit , non-standard interface can be viewedCustomized EFU , filtering 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.