How to confirm the EFU air inlet space? Equipment drawings, installation conditions and acceptance methods

How to confirm the EFU air inlet space? It doesn't just need to check whether there is any obstruction in front of the air inlet. The air inlet space determines the inlet resistance, and the inlet resistance affects the fan operating point and actual air volume. The air inlet is blocked by structures, cables, or adjacent components. The inlet resistance increases and the air volume decreases. The air inlet direction conflicts with the air flow inside the equipment, making the inlet air flow unstable. The air inlet source is close to the process exhaust, and the EFU may inhale air containing particles or corrosive gases. To confirm the air inlet space, the equipment drawings, installation conditions and installation acceptance must be combined to check the clearance, direction, source and obstruction. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The box structure, installation interfaces and complete machine working points involved in the air inlet space can be checked according to the equipment drawings within the same manufacturing system. There is no need to confirm back and forth between the sheet metal factory, fan factory and complete machine factory. This is why many equipment manufacturers will refer to the Aili Industrial structure description when confirming the EFU air inlet space.

Equipment drawings: The position of the air inlet should correspond to the surrounding structure

The first step to confirm the air inlet space is to check the EFU confirmation drawing and the equipment general drawing on the same basis. Which side of the EFU is the air inlet on, which direction is it facing, how far is it from the internal structure of the device, and are there any moving parts or cables around it? These should be confirmed at the drawing stage. The drawing only shows the appearance of the EFU and does not indicate the relationship between the air inlet and surrounding structures. After installation, you may find that the air inlet is facing the structure or cables.

Ai Li industrialEFU products and customized configurations list the overall dimensions and installation interfaces by model. When checking the position of the air inlet, the equipment manufacturer can directly correspond to the specific model, and stack the EFU confirmation drawing and the equipment general drawing for verification.

Headroom requirements: How much space should be left around the air inlet

Leave enough clearance around the air inlet to allow air to enter smoothly. Insufficient headroom, inlet resistance increases, fan operating point deviates, and air volume decreases. Headroom requirements are related to the air inlet size, air volume and inlet structure. A fixed number cannot be applied to all models. When confirming the air inlet space, determine the clearance range based on the air inlet size and air volume of the target model, and then check the actual space inside the equipment.

Regarding the relationship between air inlet resistance and system resistance, please refer toHow to calculate EFU working static pressure? adding up the resistance of filters, air inlets and equipment air ducts . Calculation method for For the influence of inlet resistance on actual air volume, please refer toWhy is the actual air volume of the EFU lower than the rated value? System Resistance, Filter and Installation Condition Analysis .Instructions in

Source of air intake: Avoid inhaling process exhaust air and pollutants

Confirmation of the air inlet space also depends on the source of the air inlet. If the EFU inhales air from inside the equipment, and the air inlet is close to the process exhaust or cavity opening, it may inhale air containing particles or corrosive gases, increase the burden on the filter, and may also bring pollutants to the protected area. When confirming the air inlet space, confirm the distance between the air inlet and the process exhaust, cavity opening and pollution source, and lead the air inlet to a relatively clean area if necessary.

For the relationship between air inlet source and filter configuration, please refer toHow to configure the etching equipment EFU? how to coordinate clean air supply, process exhaust and corrosive environment .Coordination ideas on

Air flow direction: The inlet air must not conflict with the air flow inside the device.

The confirmation of air inlet space also depends on the direction of air flow. The EFU air inlet faces upstream or downstream of the air flow inside the device, which will affect the stability of the inlet air flow. If the air inlet direction conflicts with the air flow inside the equipment, vortex or pulsation may occur at the inlet; the air inlet is directly opposite the exhaust outlet, and clean air may be taken away directly. When confirming the air inlet space, consider the internal air flow path of the equipment to determine whether the air inlet direction is reasonable.

For the relationship between airflow boundary and protection effect, please refer toWhy does the same air volume produce different cleaning and protection effects? As explained in, the inlet direction, airflow path and boundary interference are considered together.

Installation location: air inlet space and maintenance space together

The confirmation of the air inlet space should also be considered together with the installation location and maintenance space. The air inlet needs clearance, and space is also needed for filter replacement and fan maintenance. The air inlet faces the maintenance channel, which may block the air inlet during maintenance; the air inlet faces deep inside the device, and maintenance tools may not be able to reach in. When confirming the air inlet space, the accessibility of maintenance actions must also be confirmed.

For the relationship between installation location and maintenance space, please refer toHow to confirm the EFU installation location? Equipment drawings, installation conditions and acceptance methods andWhat should we pay attention to when maintaining the EFU space? structural, electrical, commissioning and rectification points .Checking methods in

Acceptance method: Headroom, pressure difference and air volume must be verified together

The acceptance of the air inlet space cannot just look at 'whether there is anything blocking the air inlet'. It is necessary to measure the pressure difference before and after the air inlet, the air volume of the whole machine and the inlet wind speed distribution under the target air volume to confirm that the headroom meets the requirements. High pressure difference, low air volume, and uneven distribution of inlet wind speed may indicate insufficient air inlet space. The acceptance record should retain the location of the measuring points, measurement conditions and judgment standards as the baseline for subsequent maintenance.

For the measurement method of inlet pressure difference and air volume, please refer toHow to evaluate EFU wind speed uniformity? Measuring points, averages, deviations and measurement steps in acceptance methods.

Aili Industrial's EFU air inlet space matching

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The box structure, installation interfaces and complete machine working points involved in the air inlet space can be checked according to the equipment drawings within the same manufacturing system. The position of the air inlet, clearance requirements and complete machine interfaces do not need to be transferred between multiple suppliers. For equipment with limited air inlet space, Aili Industrial can organize prototype verification and batch curing according to the confirmation drawing, and put the air inlet location, clearance requirements and acceptance data into verifiable complete machine data. Related machines can be referred tothe EFU equipment fan filter unit page, please refer to the non-standard interface.For the structural description on Customize EFU page.Customization instructions in the

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 location of the air inlet, headroom requirements, air inlet source, air flow direction, installation location and acceptance method to the supplementary list, and then organize a comparison after the supplier responds. The confirmed air inlet space, complete machine configuration and interfaces are used for order execution, and sample dimensions 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 box, fan, filter and control correspond one by one according to the order list, which facilitates the equipment factory to confirm the air inlet space and settle it on the verifiable complete machine conditions.

Misunderstandings to avoid

We should avoid looking only at whether there is a blockage in front of the air inlet. We should avoid applying fixed headroom numbers to all models. We should avoid ignoring that the air inlet source is close to the process exhaust. We should avoid the conflict between the air inlet direction and the air flow inside the equipment. We should avoid blocking the air inlet by the maintenance space. We should avoid accepting only looking at the appearance without measuring the pressure difference and air volume. The core of EFU air inlet space confirmation is not 'it looks empty', but that the clearance, source, direction and occlusion can form a verifiable closed loop. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the clearance, source and acceptance conditions together.

Related questions and answers

Can the EFU be run directly according to the factory parameters after being installed on the device?

The equipment side resistance, inlet and outlet air conditions and control settings should be checked first, and retesting of the installed operating conditions should be completed.

How to promote the confirmation of EFU air inlet space 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 clearance, source and acceptance conditions together.

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

Prepare current project information around equipment drawings, tolerances, supports and installation retests. The equipment general drawing, EFU confirmation sheet and installation 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 confirming the EFU air inlet space, you can refer to the structure and installation instructions provided by Aili Industrial according to the model.

Related articles

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How to calculate EFU working static pressure? How to add the resistance of filters, air inlets and equipment air ducts

Why is the actual air volume of the EFU lower than the rated value? System resistance, filter and installation condition analysis

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 box structure, installation interfaces and complete machine working points involved in the air inlet space can be checked according to the equipment drawings within the same manufacturing system. The position of the air inlet, clearance requirements and complete machine interfaces do not need to be transferred between multiple suppliers. The equipment factory completes the air inlet space confirmation 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 , non-standard interface can be viewedCustomized EFU , filtering package can be viewedHEPA and ULPA air filters , the control scheme can be viewedDC speed regulating EFU equipment fan filter unit . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.