Air Shower Pass Box: Troubleshooting Low Airflow Issues
创建于06.25
Problem: Low Airflow in Air Shower Pass Box
When the airflow in an Air Shower Pass Box becomes noticeably weaker than normal, it can compromise the cleanliness of the controlled environment. This issue typically manifests as:
l Weak or insufficient airflow during operation
l Longer air shower cycles
l Pressure differential alarms
Possible Causes
Based on the provided fault analysis table, the two most common causes of low airflow are:
Clogged Pre-Filter
l The pre-filter captures large particles before air passes through the HEPA filter.
l Excessive dust accumulation increases airflow resistance, reducing overall efficiency.
Failed HEPA Filter
l The HEPA (High-Efficiency Particulate Air) filter ensures clean airflow.
l Over time, it can become clogged or develop leaks, reducing performance.
Step-by-Step Troubleshooting & Solutions
1. Replace the Pre-Filter
Steps:
l Power off the Air Shower Pass Box for safety.
l Open the pre-filter access panel.
l Remove the old pre-filter carefully to avoid spreading dust.
l Clean the filter housing to remove residual debris.
l Install the new pre-filter, ensuring a proper seal.
l Power on the unit and test airflow.
Maintenance Tips:
✅ Replace pre-filters every 3–6 months (or more frequently in high-dust environments).✅ Always use compatible filters to maintain performance.
2. Replace the HEPA Filter
Steps:
l Wear PPE (mask, gloves) to avoid contamination.
l Disconnect power to the unit.
l Remove the HEPA filter cover panel.
l Carefully extract the old HEPA filter.
l Clean the mounting frame and sealing surfaces.
l Install the new HEPA filter, ensuring airtight sealing.
l Reassemble the unit and perform a leak test (DOP/PAO test recommended).
Maintenance Tips:
✅ HEPA filters typically last 1–2 years but may need earlier replacement in harsh conditions.✅ After replacement, calibrate the pressure sensor (if equipped).
Preventive Maintenance Recommendations
To avoid recurring airflow issues:
Mnitor Airflow Weekly – Use an anemometer to check air velocity. Set Filter Replacement Reminders – Track usage and replace filters proactively. Inspect Seals & Gaskets – Ensure no air leaks around filter edges. Log Maintenance Activities – Keep records of replacements and tests.
Conclusion
Low airflow in an Air Shower Pass Box is often caused by clogged pre-filters or worn-out HEPA filters. Regular maintenance and timely replacements can restore optimal performance. If airflow remains weak after filter replacement, check the blower motor, duct obstructions, or control system for further issues.
For complex repairs, consult a qualified technician to ensure compliance with cleanroom standards.
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