How to distinguish the air inlet end and the air outlet end of EFU? Air flow direction, installation location and interface instructions

Direct answer: The difference between the air inlet and outlet ends of the EFU mainly depends on the direction of air flow: the air enters the box from the air inlet end, is driven by the fan and filtered by the filter, and is sent from the air outlet end to the target clean area. The distinction can be confirmed from three directions: first, look at the box logo and structure, the filter is usually located on the air outlet side; second, look at the position of the fan, the fan is usually close to the air inlet end or between the air inlet and the filter; third, look at the interface design, the air outlet end is usually connected to the target clean area, and the air inlet end faces the internal space of the equipment or the return air area. The installation location will directly affect the choice of air inlet and outlet directions.

Correctly distinguishing the air inlet end and air outlet end of the EFU is a prerequisite for installation, takeover and debugging. If the air inlet and outlet directions are reversed, the filter will be contaminated, the air speed will be insufficient, or the cleaning effect will not be up to standard. The following will start from three aspects: air flow direction, installation location and interface.

1. How to judge the direction of air flow

The basic airflow path of the EFU is:

Air enters the air inlet end → fan drive → filter filtration → clean air is sent out from the air outlet end

To determine the air inlet and outlet ends, you can confirm from the following aspects:

If the label is unclear, it is recommended to refer to the product drawings or technical documents to avoid judging based on appearance alone.

2. The influence of installation position on the direction of air inlet and outlet

The installation position of the EFU will affect the selection of the air inlet and outlet directions:

1. Top installation : air inlet from the top, air outlet from the bottom, direct airflow path, suitable for equipment with sufficient top space;

2. Side installation : side air inlet or side air outlet, suitable for equipment with limited top space;

3. Embedded inside the equipment : It is necessary to confirm the air inlet and outlet direction based on the internal structure of the equipment and the target clean area;

4. Install close to the equipment : the air outlet end is close to the target area, and the air inlet end faces the inside of the equipment or the return air area;

5. Multiple units connected in parallel : When installing multiple EFU units, it is necessary to ensure that the air inlet and outlet directions of each unit are consistent to avoid mutual interference of air flows.

After the installation location is determined, the direction of the inlet and outlet wind is also determined. If the internal space of the device is limited, please refer toSmall size EFU equipment fan filter unit andthe 70mm ultra-thin EFU confirms the air inlet and outlet methods.The structural plan of

3. Air outlet interface description

The air outlet directly faces the target clean area, and the interface design needs to be confirmed:

1. Air outlet size : matches the target area or device interface;

2. Air outlet direction : vertically downward, sideways or other directions;

3. Flow equalization structure : whether a flow equalization net or diversion structure is needed to improve wind speed distribution;

4. Sealing method : Whether sealing is required between the air outlet and the equipment interface;

5. Air supply distance : the distance from the air outlet surface to the target area, which affects the actual arrival wind speed;

6. Maintenance space : Whether there is room for filter replacement at the air outlet end.

The design of the air outlet interface directly affects the air supply effect, and it is recommended to confirm it simultaneously during the equipment structure design stage.

4. Air inlet interface description

The air inlet end faces the internal space or return air area of ​​the equipment, and the interface design needs to be confirmed:

1. Air inlet size : Whether the air inlet area is sufficient to avoid excessive local wind speed;

2. Location of the air inlet : whether it is blocked by mechanical structures, pipes or cables;

3. Protective structure : whether a protective net or grille is needed to prevent foreign objects from entering;

4. Filtration pretreatment : whether primary filtering or protective net is needed to reduce the entry of large particles;

5. Return air path : Whether the air inlet end is smoothly connected with the return air path;

6. Maintenance space : Whether there is a need for maintenance space at the air inlet end.

Once the position of the air inlet is determined, the box structure and fan installation direction are also determined.

5. Precautions for installation at the air inlet and outlet ends

When installing EFU, pay attention to the following at the air inlet and outlet ends:

1. Direction confirmation : Before installation, confirm that the direction of the air inlet and outlet is consistent with the equipment requirements;

2. Seal inspection : Whether the seal between the air outlet and the equipment interface is in place;

3. Blockage inspection : Whether there are structural blocks at the air inlet and outlet ends;

4. Wiring location : Whether the electrical interface is easy to maintain;

5. Fixing method : Whether the installation and fixation are firm to avoid vibration during operation;

6. Marking confirmation : After installation, confirm that the inlet and outlet directions are clearly marked to facilitate subsequent maintenance.

If the wind speed is found to be uneven after installation, it can be checked from three aspects: fan position, filter status and structural shielding. For specific methods, please refer towhat to do if the EFU air outlet speed is uneven .Troubleshooting ideas on

6. Information required to confirm the direction of inlet and outlet wind

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

1. Equipment installation space and installation location;

2. Target clean area location;

3. Inlet and outlet wind direction requirements;

4. The distance from the wind outlet surface to the target area;

5. Return air path and site layout;

6. Internal occlusion of the equipment;

7. Interface size and sealing requirements;

8. Maintenance space and inspection methods.

7. Aili Industrial EFU air inlet and outlet supporting capabilities

Aili Industrial has the following supporting conditions in terms of EFU air inlet and outlet structures:

• Structural design : The air inlet and outlet methods can be designed according to the equipment installation space;

• Self-produced sheet metal : It has sheet metal processing capabilities and can manufacture boxes and interface structures;

• Sealing package : The sealing scheme can be designed according to the air outlet interface;

• Whole machine verification : conduct air volume, wind speed, resistance and operation tests before leaving the factory;

• Customization capabilities : The cabinet, air inlet and outlet methods, and installation structure can be customized according to the equipment space.

For more product information, please refer toEquipment-side fan filter unit (EFU)、Custom EFU andDC EFU equipment fan filter unit。

FAQ

How to distinguish the air inlet and outlet ends of EFU?

It mainly depends on the direction of air flow: air enters from the air inlet end, is filtered by the filter, and is sent out from the air outlet end. It can be confirmed through the box identification, filter position, fan position and product drawings.

Is the filter on the inlet side or on the outlet side?

The filter is usually located on the air outlet side, close to the air outlet surface. The air is filtered by the filter and then sent to the target area.

Can the EFU installation direction be adjusted?

Some EFUs can customize the air inlet and outlet directions according to the equipment requirements, which need to be confirmed based on the box structure and installation method.

What will happen if the air inlet and outlet directions are reversed?

It may cause the filter to be contaminated, the wind speed is insufficient, or the cleaning effect is not up to standard. Before installation, you should confirm that the air inlet and outlet directions are consistent with the equipment requirements.

Does the air outlet need to be sealed?

The air outlet end and the equipment interface usually need to be sealed to prevent clean air from leaking or external air from entering.

Is a protective net needed at the air inlet end?

A protective net or grille can be configured according to project requirements to prevent foreign matter from entering the box.

What should we pay attention to in the air inlet and outlet directions when installing multiple EFUs?

It is necessary to confirm that the air inlet and outlet directions of each unit are consistent to avoid airflow interference with each other or short circuit.

Can the EFU air inlet and outlet method be customized?

Can. The air inlet and outlet methods and interface structure can be customized according to the equipment installation space and air flow organization requirements.

The content of this article is for reference only, please confirm with the actual project. The air flow direction, air inlet and outlet methods, interface structure and installation parameters mentioned in this article may vary depending on product models, project conditions and actual working conditions. For specific EFU solutions, please refer to the actual confirmed product technical documents, drawings and test results.