How to design the ULPA sealing surface? Side width, aluminum profile and equipment sheet metal coordination

The design of the ULPA filter sealing surface must coordinate the working conditions of the filter frame side width, profile stiffness, equipment sheet metal and sealing materials. Effective sealing requires a continuous, flat, and force-controlled contact area. Just because the side width is large enough does not mean that it can be used for sealing, and the profile is thick enough does not mean that it will not deform after being stressed. The design should check these items together. Aili Industry has corresponding capabilities in filter frame manufacturing, sheet metal processing and complete machine assembly, and can cooperate to check boundary conditions during the sealing surface design stage.

1. Determine the available width of the sealing surface

Deduct the hole position, folding edge, seam and assembly deviation, and check the actual placement point of the seal. Just because the outer frame looks wide, it doesn't mean that all widths can be used for sealing.

The area occupied by holes, hems and seams cannot form continuous contact and should be deducted item by item when calculating the available width. The relationship between sealing method and contact width can be referred toHEPA FAQs and Selection Guide。

2. Consider profile and sheet metal deformation

Long edges, thin sheets, and sparse pinch points can cause localized warping. Support and force design should be combined to avoid relying on increased fastening force to make up for insufficient stiffness.

Increased tightening force will cause new deformation of thin plates or long-side profiles, making the sealing worse. The stress conditions on the ceiling structure side can be combinedFFU fan filter unit .Check the installation method of

3. Verify materials and processing status

Check for burrs, surface cleanliness and sealing material compatibility. After the sample is assembled, leaks are detected according to regulations, and the impact of tolerance superposition on continuous fit is evaluated.

Burrs and processing residues will push up the seal and form local gaps; incompatible materials may cause the seal to age or deform. For the sealing conditions installed inside the equipment, please refer tothe fan filter unit on the EFU equipment side .Instructions related to

4. When the sheet metal seam is just under the gasket, it must be processed separately.

When a sheet metal seam is located just below a gasket, verify that the seam is flat and airtight rather than just checking gasket specifications. If the joints are not smoothed, the compression amount of the gasket will be different from that of the surrounding area, forming an air leakage path.

Aili Industry isFor the HEPA/ULPA filter frame manufacturing and ceiling sheet metal interface, the side width, profile and sheet metal joints can be checked under the same drawing conditions.For non-standard ULPA filter projects, the continuity of the sealing surface can be confirmed before batch arrangement.

5. Related questions and answers

Can the sealing surface be filled with glue instead of processing control?
Size and flatness issues should be addressed first. Whether glue repair is allowed needs to be confirmed according to the structure and acceptance requirements, and cannot be used as a universal method for all uneven problems.

Is the sealing more reliable when the edge width is larger?
uncertain. The available width must be deducted from holes, folds and seams, and must be continuously flat. Areas with wide edges but interrupted by seams do not form an effective seal.

What to do if the profile stiffness is insufficient?
We should start from the support position and the layout of the pressing points, rather than simply increasing the tightening force. Increasing the tightening force may further deform the profile.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

HEPA FAQs and Selection Guide

FFU FAQ and technical support

EFU FAQ and technical support

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industrial canThe ULPA filter size, sheet metal interface, fan space and complete machine assembly are checked under the same drawing.The non-standard ULPA filter project can provide the equipment opening, installation direction, target air volume and testing space. First confirm the sample fit and then arrange the batch. Ceiling projects can be combinedFFU fan filter unit discusses the installation structure, and equipment-side items can be checked at the same timeEFU equipment side fan filter unit . Provide process objectives, installation drawings, operating conditions and acceptance requirements for further communicationULPA ultra-high efficiency filters . Standard specifications, non-standard interfaces, samples and batch matching of The specific parameters and test range are based on the confirmed model and technical documents.