How to design the special air outlet EFU? It should be determined backward from the target clean area instead of determining the opening shape first.

Direct answer: The design of the special air outlet EFU should proceed backward from the target clean area, rather than determining the opening shape first. It is necessary to first clarify the air supply coverage, allowable wind speed, equipment shielding and return air path, and then determine the outlet size and internal diversion structure.

In non-standard EFU customization projects, the air outlet is often limited by the equipment space, process area and installation interface. If the shape of the opening is determined first and then the air volume and wind speed are calculated backwards, problems such as excessive local wind speed, uneven air supply, increased noise, or acceptance disputes may easily occur. A more reasonable approach is to first define the cleanliness target and then design the air outlet structure.

1. First draw the target air supply range

Mark the key process areas, mechanical movement ranges and parts that cannot be blown directly on the equipment drawings, and determine the locations that need to be covered and avoided.

This step is the basis for the special air outlet design. Before designing, it should be clear:

• Which areas must achieve target wind speeds or cleanliness levels;

• Which parts cannot be blown directly;

• Whether the mechanical range of motion will block the wind;

• Whether the return air path is smooth and whether there are short circuits or dead corners;

• Whether the measuring plane and measuring point locations are operable.

Only by first determining the air supply target can we determine whether the air outlet should be in the form of a strip, a partial opening, an orifice plate, a multi-point air outlet, or a connected air duct.

2. The outlet shape will change the velocity distribution

Long openings, partial openings, orifice plates or connecting air ducts have different resistances. After the outlet area is reduced, local wind speed and noise may increase.

The shape of the special air outlet not only affects the appearance and installation, but also directly affects:

• Outlet wind speed distribution;

• static pressure loss;

• Fan working point;

• noise level;

• Uniformity of cross section in front of filter;

• Actual coverage effect of clean area.

Therefore, the size and shape of the outlet should be designed after the target air volume, allowable wind speed and structural boundaries are determined, rather than opening holes first and then matching the fan.

3. The internal diffusion space cannot be compressed

A reasonable diffusion distance is required between the fan outlet and the filter or special outlet. When space is insufficient, uniformity should be assessed through structural optimization and multi-point testing.

In ultra-thin EFU, small size EFU or special interface EFU, the internal diffusion space is often compressed. At this time, you need to focus on:

• Whether the fan outlet is too close to the filter;

• Whether there is a local high-speed zone;

• Whether the diversion structure causes additional resistance;

• Whether the wind speed on the outlet surface meets the uniformity requirements;

• Whether noise and vibration are within acceptable limits.

When space is limited, it is recommended to assist the design through CFD simulation and confirm it with actual measurement of the prototype.

4. The acceptance method should be agreed upon during the design stage

Clarify the measurement plane, number of measurement points, air volume or wind speed judgment value, and the actual operating status of the equipment to avoid deviations due to different methods after delivery.

Common disputes in EFU non-standard projects are often not caused by the product itself, but by failure to unify the acceptance methods in advance. The design phase should confirm:

• Measure plane position;

• Number of measuring points and point distribution method;

• Air volume, wind speed or static pressure judgment value;

• Filtration efficiency requirements;

• power supply and control methods;

• The actual operating conditions of the equipment;

• Allowable deviation range.

5. Project confirmation form

6. How does Aili Industry cooperate with this type of EFU project?

When Aili Industrial handles non-standard EFU customization projects, it will first confirm the equipment boundaries and acceptance conditions, and then match the fans, motors, filters, boxes and control systems. For ultra-thin, small-sized or special interface solutions, the curing drawings, materials and control parameters can be tested through the prototype and the first machine to facilitate consistent configuration in subsequent batches.

During project communication, the following information can be provided to determine whether standard products are suitable or whether non-standard design is required:

• Available length, width and height inside the device;

• Target air supply area;

• Air volume or wind speed requirements;

• Static pressure or air duct information;

• Filtration efficiency;

• power supply;

• control method;

• Estimated quantity.

FAQ

The smaller the outlet, the more concentrated the air supply?

Local wind speeds may increase, but so will drag, noise, and uniformity. Special air outlet EFU cannot improve concentration by simply narrowing the outlet. It needs to be comprehensively evaluated based on fan performance, internal diffusion space, and actual air supply targets.

Can I use only simulation results for acceptance?

Simulation can assist design, and ultimately it should be confirmed by actual measurement according to the agreed working conditions. For non-standard EFU projects, it is recommended to combine simulation, prototype testing and first unit acceptance.

What should be determined first for special air outlet EFU?

The target clean area, air supply coverage, allowable wind speed, equipment shielding and return air path should be determined first, and then the outlet size and internal diversion structure should be determined.

What parameters need to be provided for non-standard EFU customization?

It is recommended to provide the available space inside the equipment, target air supply area, air volume or wind speed, static pressure or air duct information, filtration efficiency, power supply, control method and estimated quantity.