Direct answer: The selection of small-sized EFU should be confirmed from the four key points of equipment opening size, target air volume, effective filtration area of ​​the filter and control interface, instead of first selecting a standard product with similar size. The equipment opening determines the shape boundary of the box, the air volume determines the fan working point, the filter area determines the surface wind speed and resistance, and the control interface determines whether it can be linked with the equipment system. The four restrict each other. If any one is decided first, it will compress the choice space of the other three.

Small-sized EFU is often used in scenarios where the internal space of the equipment is limited but local clean air supply is still required. The smaller size does not mean that the performance can be scaled down. On the contrary, it is more likely to cause problems such as insufficient air volume, uneven surface wind speed, increased noise, and mismatched interfaces. Below are the four main points explained one by one.

1. Point 1: The size of the equipment opening determines the box boundary

Equipment opening is the first constraint for small-size EFU selection. Need to confirm:

• The available dimensions of the opening are length, width and depth;

• Are there any mechanical structures, pipes or cables interfering around the opening?

• Whether the installation surface is flat and whether it can meet the sealing requirements;

• Is there room for filter replacement and fan maintenance?

• Does the opening allow fine-tuning on site or does it have to be in place in one go.

Once the equipment opening is determined, the outline boundaries of the EFU box are also determined. At this time, you should not only look at the box size, but also confirm whether the filter, fan, control panel and terminal blocks can be loaded into this space at the same time.

For equipment with particularly tight openings, please refer tothe fan filter unit of the small-sized EFU equipment is combined with the specific opening size to make non-standard adjustments.The compact structure of

2. Point 2: The air volume should be confirmed according to the target area, not just the nominal value.

When selecting air volume for small-sized EFU, a common misunderstanding is to directly compare the nominal air volume of the fan. Actual air volume will be affected by the following factors:

1. System resistance : filter resistance, air inlet local resistance, air outlet resistance;

2. Box structure : The internal diffusion space of a small box is limited, making airflow organization more difficult;

3. Filter grade : H14 filter resistance is usually higher than H13, and ULPA is higher;

4. Installation method : opening position, air supply distance and return air path will all affect the actual effect;

5. Fan operating point : The working conditions corresponding to the nominal air volume are often different from the actual system working conditions.

Therefore, for small-size EFU, the required air volume should be inferred based on the wind speed and coverage area of ​​the target air supply area, and then combined with the system resistance to confirm the fan operating point. For applications that require speed regulation and equipment linkage, considerDC EFU equipment fan filter unit solution.

3. Point 3: Filtration area determines surface wind speed and resistance

Filtration area is one of the most easily overlooked but most influential factors in small-size EFU selection.

Under the same air volume, the smaller the filtration area, the higher the wind speed on the windward side of the filter. The result is:

• The filter resistance increases and the fan load increases;

• The surface wind speed is uneven and local high-speed areas affect the cleaning effect;

• The dust holding capacity of the filter decreases and the replacement cycle is shortened;

• Noise and vibration may increase.

Small-sized EFU is limited by the box space, and the filter area often cannot be enlarged. Therefore, a balance needs to be made between air volume, filter area and noise. Common processing methods include:

• Choose a filter that is thinner but has a more densely folded filter material;

• Use reasonable diversion structures to improve the uniformity of the windward surface;

• Appropriately reduce the target wind speed to avoid excessive pursuit of high air volume;

• Choose the appropriate filtration level according to the cleanliness requirements, rather than blindly selecting a high level.

For equipment that requires frequent filter replacement, please refer toSnap-on EFU filter fixing and disassembly structure.

4. Point 4: The control interface must be able to communicate with the equipment system

Small-sized EFU is often used in device-side applications. Whether the control interface matches or not directly determines whether debugging and acceptance can go smoothly.

Need to confirm:

If the number of equipment is small and centralized operation is required on site, we can cooperate withThe small FFU/EFU controller realizes start and stop, speed adjustment and communication status viewing.

If the device is sensitive to static electricity, you can configureAnti-static EFU , taking into account both cleanliness and static electricity control in a limited space.

5. Common misunderstandings in small-size EFU selection

1. Select based on box size only : ignore filters, fans and wiring space;

2. Only look at the nominal air volume : ignore the actual air volume drop caused by system resistance;

3. Ignoring the filtration area : the face wind speed is too high, and the cleaning effect and filter life are affected;

4. Post-confirmation of the control interface : the equipment system has been finalized and the EFU cannot be linked;

5. Ignore the maintenance space : the filter cannot be replaced, and subsequent maintenance costs will increase;

6. The acceptance method was not agreed upon in advance : the measurement plane, number of measurement points and judgment values ​​were not uniform.

6. Small-size EFU selection direction in different equipment scenarios

• Semiconductor equipment : compact space, high cleanliness requirements, and often need to be linked with the equipment main control;

• SMT placement machine : top space is limited, please refer toFFU/EFU dedicated to SMT placement machines ;Adaptation ideas for

• Ultra-thin installation scenario : when height is limited, please refer toThe structural direction of the ultra-thin EFU ;

• Static-sensitive equipment : anti-static module can be configured;

• In-depth non-standard projects : please refer toThe overall customization process of customizing the fan filter unit at the EFU equipment end .

7. What information is required for small size EFU selection?

It is recommended to provide: when communicating with the project:

1. Equipment opening size and installation space;

2. Target air supply area and allowable wind speed;

3. Air volume, static pressure or air duct resistance information;

4. Filtration efficiency requirements;

5. Filter size restrictions;

6. Power supply, control methods and communication requirements;

7. Maintenance space and replacement methods;

8. Equipment drawings or installation interface sketches;

9. Estimated quantity and delivery date.

When Aili Industrial handles small-sized and non-standard EFU projects, it will first confirm the equipment boundaries and acceptance conditions, and then match the fans, motors, filters, boxes and control systems. For ultra-small size, ultra-thin or special interface solutions, the curing drawings, materials and control parameters can be tested through the prototype and the first one, so that the configuration can be consistent in subsequent batches. For more product systems, please refer toEquipment-side fan filter unit (EFU)。

FAQ

How big can the smallest size EFU be?

Dimensions need to be confirmed in conjunction with filters, fans and control components. Some of the ultra-small size EFU cabinets of Aili Industrial can reach the 350×180×100mm level. The specific size needs to be confirmed according to the project.

Will the air volume of the small size EFU be insufficient?

Air volume depends on fan selection, system resistance and filter configuration. For small-sized EFU, the air volume should be deduced based on the wind speed in the target area and the actual working point should be confirmed.

Can small size EFU be equipped with H14 filter?

Can. HEPA H13/H14 or ULPA U15/U16 filters can be configured according to cleanliness requirements. The specific size must match the cabinet.

Can the speed of small size EFU be adjusted?

Can. Multi-stage speed regulation, stepless speed regulation or communication speed regulation can be configured according to the control scheme.

Can small-sized EFU be group controlled by multiple units?

Can. Single unit, group, centralized or communication control can be configured according to project requirements.

What devices are small size EFU suitable for?

Suitable for semiconductor equipment, placement machines, precision testing equipment, automation equipment and local clean units with limited space.

What should we pay attention to when accepting small-sized EFU?

The measurement plane, number of measurement points, air volume or wind speed determination value, and the actual operating status of the equipment should be agreed upon during the design stage.