What details should be noted when installing an embedded transfer window?

A Detailed Guide to the Entire Installation Process of Embedded Transfer Windows (with Technical Parameters and Key Points to Avoid Pitfalls)
I. Wall pretreatment and reservation of Installation holes
Wall material and load-bearing requirements
The thickness of the wall should be ≥100mm. Common types:
Color steel plate: Rock wool sandwich panels with A thickness of ≥0.8mm (fire resistance grade A) should be selected.
Brick-built walls: Concrete precast frames need to be built in advance (to prevent wall cracking).
Load-bearing test: When the transfer window is fully loaded (such as 100kg), the walled settlement is ≤0.5mm/㎡.
Dimensional accuracy of installation holes
The width and height of the reserved hole should be 5-10mm larger than the transfer window box (for example, the box size is 1000×1000mm, and the reserved hole is 1010×1010mm).
The diagonal error is ≤2mm and the flatness error is ≤1.5mm/m (calibrated with a laser level).
Ii. Clean Area control before Installation
Environmental cleanliness standard
Twenty-four hours before installation, the construction area should be disinfected with ozone (concentration ≥ 20 ppm, action time ≥30 minutes).
During construction, clean suits and shoe covers must be worn. Tools should be wiped with 75% alcohol (ordinary lubricating oil is prohibited).
Equipment unboxing specifications
Open the box in the adjacent clean area, and wipe the surface of the box with a lint-free cloth dipped in isopropyl alcohol.
The filter should be kept in its original packaging and unsealed before installation (to prevent contamination of the filter material).
Iii. Box fixation and Sealing Treatment
Horizontal and vertical calibration
Adjust the box body with a high-precision level (accuracy 0.05mm/m), with the levelness deviation ≤1mm and the verticality deviation ≤2mm.
The bottom is raised with metal gaskets (with a thickness of 0.5-2mm) to ensure that the box is closely attached to the wall.
Key points of the sealing process
Fill the joint with food-grade silicone sealant (such as Dow Corning 737), with the sealant layer thickness ≥3mm, and there should be no bubbles or broken sealant.
The corner connection points should be treated with R corners (radius ≥50mm) to prevent dust accumulation.
After sealing, conduct a smoke test: Release smoke inside the box and observe from the outside that there is no leakage at the joint (air leakage volume ≤0.1m³/h · m).
Iv. Installation of Electrical and Purification Systems
Electrical Wiring Specification
The interlock circuit needs to adopt dual protection (mechanical interlock + electronic interlock), and the wires should be run through metal bellows (protection grade IP54).
The grounding resistance should be ≤4Ω. The static discharge terminal needs to be connected to the workshop grounding system (the cross-sectional area of the grounding cable should be ≥6mm²).
Key Points for Filter Installation
Before the HEPA filter is installed, a leakage test (DOP method, scanning wind speed 0.35±0.05m/s, leakage rate ≤0.01%) is required.
When installing, wear dust-free gloves. The gap between the filter frame and the box body should be compacted with sealing strips (compression ≥50%). Do not touch the filter material with your hands.
V. Function Debugging and Performance Verification
Interlocking system test
When one side door is opened, the other side door should not be able to open (response time ≤0.5 seconds).
The door can be opened and closed continuously 50 times without any jamming of the interlocking mechanism (the closing force of the door is ≤40N).
Verification of airflow and cleanliness
Wind speed test: The average wind speed at the supply air surface is 0.45±0.1m/s (measured by multi-point anemometers, with one measurement point per 0.3 square meters).
Cleanliness test: After installation, run it unloaded for 30 minutes. Use a particle counter for detection. In the ISO 5 level area, the number of particles ≥0.5μm is ≤3520 per cubic meter.
Vi. Installation Precautions for Special Scenarios
Key details of the application scenario
Pharmaceutical GMP workshop - The box body needs to undergo passivation treatment (nitric acid concentration 20-25%), and the surface roughness Ra≤0.8μm;
The wavelength of the ultraviolet lamp is 253.7nm, and the irradiation intensity is ≥40μW/cm² (1m away from the lamp tube).
Semiconductor cleanroom - All metal components need anti-static coating (surface resistance 10⁶-10⁹Ω);
After installation, it needs to pass the SEMI S2 standard certification (micro-vibration test ≤50μm/s²).
Biosafety laboratory - Double-door transfer Windows need to be equipped with vaporized hydrogen peroxide sterilization function (H₂O₂ concentration ≥6mg/L, sterilization time ≥60 minutes);
The exhaust air must be filtered through a high-efficiency filter before being discharged.
Vii. Common Installation Errors and Avoidance Solutions
Risk of wall cracking
Error: Directly drill holes in the lightweight partition wall for installation;
Countermeasures: Install a metal reinforcing frame (Angle steel specification ∠50×50×5mm), and fix the frame to the wall with expansion bolts (spacing ≤300mm).
Filter leakage
Error: The sealing rubber strip is aged or the compression is insufficient;
Countermeasures: Select silicone rubber strips (with a temperature resistance range of -60 ℃ to 200℃), and tighten the frame bolts with a torque wrench (torque 8-10N · m) during installation.
Viii. File archiving after installation
Documents to be submitted:
Installation Confirmation Report (IQ): Including wall structure drawings and sealing test records;
Operation Confirmation Report (OQ): Interlock function, wind speed test data;
Performance Confirmation Report (PQ): Cleanliness Test Report (third-party certification);
Material proof: SGS report of stainless steel plate (for 316L material, the molybdenum content should be ≥2.0%).
Summary: The core of the installation of embedded transfer Windows lies in "precision control" and "clean protection". From wall pretreatment to the sealing process, each link needs to comply with the ISO 14644-4 standard. It is recommended to be carried out by a team with cleanroom construction qualifications (such as a contractor holding ISO 14644 certification). After installation, it passes the dual verification of FAT (Factory Acceptance Test) and SAT (Field Acceptance Test).