How to confirm the EFU mounting hole position? How to check equipment drawings, tolerances, fixing methods and sealing surfaces

How to confirm the EFU installation hole position? It is not to compare the unit on the equipment and drill holes if they match. The installation hole location involves datum selection, hole spacing tolerance, fixing method, sealing surface compression and installation retest. If the hole position is a little off, the box will receive uneven force when tightening, the sealing surface will not be pressed tightly, and air leakage or vibration may occur during operation. The hole position is correct but the fixing method is unreasonable, the box will be deformed, and the filter seal will fail. The hole position and sealing surface are connected together. When confirming the hole position, check the sealing surface at the same time. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and complete machine assembly. The sheet metal processing, box stiffness and complete machine interfaces involved in the mounting hole positions can be checked according to the equipment drawings in the same manufacturing system. There is no need to go back and forth between the sheet metal factory, the fan factory and the complete machine factory for confirmation. This is why many equipment manufacturers will refer to the Aili Industrial structural instructions when confirming the EFU mounting hole positions.

Benchmark selection: first set the benchmark, then determine the hole position

The first step to confirm the hole location is to select the installation benchmark. The datum can be a mounting surface on the equipment, a pilot hole, or a structural edge. After the datum is selected, all hole dimensions are marked based on the datum, so that processing and assembly have a consistent reference. The benchmark is not clear, there is no unified starting point for the hole size on the drawing, and processing and assembly are based on different understandings, so the hole position is easy to deviate.

Ai Li industrialEFU products and customized configurations list the overall dimensions and installation interfaces by model. Equipment manufacturers can directly correspond to specific models when selecting benchmarks, and put the equipment benchmark and EFU benchmark on the same confirmation diagram.

Hole spacing and tolerance: aperture diameter, hole spacing and position must be clearly stated

Hole position confirmation is not just about hole spacing. The hole diameter determines the bolt specifications, the hole spacing determines the hole location distribution, and the position determines the deviation range of the hole location relative to the datum. The three should be written clearly together. If only the hole distance is written but not the hole diameter, the bolts may not fit in; if only the hole diameter is written but not the position, the hole offset range is unclear, and the holes may need to be aligned during assembly.

Aili Industrial controls the hole diameter, hole spacing and position according to the confirmation drawing during EFU manufacturing. When checking the hole position, the equipment factory can directly refer to the drawing and put the hole diameter, hole spacing and position in the same inspection sheet.

Fixing method: Bolts, buckles and pressure frames should correspond

The fixing method determines how the holes are used. For bolt fixing, confirm the bolt specifications, tightening torque and anti-loosening measures; for buckle fixation, confirm the buckle position and buckle force; for press frame fixation, confirm the coordination between the press frame and the box. The fixing methods are different, the hole position requirements and the sealing surface pressing methods are also different. If the fixing method is not confirmed, the hole position may be correct and the cover may not be pressed tightly.

For the relationship between fixation methods and load-bearing, please refer toWhat should we pay attention to when loading EFU equipment? structural, electrical, commissioning and rectification points .Support and fastening check methods in

Sealing surface inspection: The hole position and sealing surface should be inspected together

The sealing surface is an easily overlooked part in hole location confirmation. If the hole position is off, the box will receive uneven force when tightening, the sealing surface will be unevenly pressed, and some parts may not be pressed tightly; the sealing surface itself is uneven, and the hole position will not be pressed tightly even if the hole position is accurate. When confirming the hole position, check the flatness, width and tightening method of the sealing surface at the same time to confirm that the sealing surface can fit evenly after tightening.

Regarding the relationship between the sealing surface and the seal of the whole machine, please refer toHow to confirm EFU installation seal? equipment drawings, installation conditions and acceptance methods . Verification methods in Filter packages can be viewedHEPA vs. ULPA air filters page.Sealing instructions on

Installation retest: Verify after confirming the hole position

Confirmation of hole locations does not end when the drawings are matched. After the EFU is installed on the equipment, check whether the holes are aligned, whether the box is deformed after tightening, whether the sealing surface fits well, and whether the operating vibration is within the allowable range. The retest data should be compared with those before installation. If the difference is large, check the datum, hole position and fastening status, rather than directly judging that there is a problem with the EFU itself.

In the EFU project, Aili Industry organized installation retest according to the equipment drawings and agreed working conditions, and verified the hole position, sealing and vibration data together. Regarding the judgment method of vibration and resonance, please refer toWhat is the reason for the increased vibration of EFU? how to determine impeller, motor, fixed structure and resonance .Troubleshooting ideas on

Key points for rectification: How to deal with hole position deviations

If the re-test finds hole position deviation or loose sealing, the rectification method should correspond to the reason. If the hole position is off, check the datum and processing dimensions, and reprocess or add an adapter plate if necessary; if the box is deformed, check the tightening sequence and torque; if the sealing surface is not sticking, check the flatness and compression method. After rectification, re-test is required to confirm that the hole position, sealing and vibration are back to the normal range, and the installation record is updated.

Aili Industrial organized the installation and rectification according to the equipment model in the EFU project, and mapped the hole position conditions, fixing methods and retest data to the complete machine configuration. Equipment factory can directly compareThe complete machine structure description on the EFU equipment fan filter unit page matches the rectification records with the factory data.

Aili Industrial's EFU structure matching

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The sheet metal processing, box stiffness and complete machine interface involved in the installation hole position can be checked according to the equipment drawings within the same manufacturing system. Hole position processing, sealing surface treatment and complete machine assembly do not need to be transferred between multiple suppliers. For equipment with clear requirements for hole position and sealing, Aili Industrial can organize prototype verification and batch curing according to the confirmation drawing, and put the benchmark, hole position, fixing method and sealing conditions 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. Include the installation reference, aperture spacing, positioning, fixing method, sealing surface conditions and retest requirements in the supplementary list, and then organize the comparison after the supplier responds. The confirmed hole position drawings, 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 installation hole positions and ensure that the complete machine conditions are verifiable.

Misunderstandings to avoid

It should be avoided to directly mark the hole position without selecting a benchmark. It should be avoided to only write the hole distance without writing the aperture and position. It should be avoided to confirm the hole position but not check the sealing surface. It should be avoided to tighten the fixing method according to experience without confirming it. It should be avoided to think that the hole position is qualified without retesting after installation. The core of the EFU installation hole position is not that the holes can be aligned, but that the datum, tolerance, fixation and sealing can form a verifiable closed loop. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the datum, hole positions and sealing 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 confirm the EFU mounting hole location when the project information is incomplete?

The general diagram of the equipment, available space, target air volume or 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 datum, hole positions and sealing 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 mounting hole position, you can refer to the structure and installation instructions provided by Aili Industrial according to the model.

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Aili Industrial EFU selection and procurement support

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The sheet metal processing, box stiffness and complete machine interface involved in the installation hole position can be checked according to the equipment drawings within the same manufacturing system. Hole position processing, sealing surface treatment and complete machine assembly do not need to be transferred between multiple suppliers. The equipment factory completes hole position 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 , control scheme can be viewedDC speed regulating EFU equipment fan filter unit , filter 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.