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An Air Shower Pass Box is a key contamination control device used in cleanrooms, pharmaceutical facilities, laboratories, and hospital pathology departments. By delivering high-velocity, HEPA-filtered air, it effectively removes particles from material surfaces during transfer between different cleanliness zones.

However, reduced or insufficient airflow is one of the most common operational issues encountered during long-term use. Low airflow not only compromises cleaning efficiency but also increases the risk of cross-contamination. This article provides a systematic guide to identifying, analyzing, and resolving low airflow problems in Air Shower Pass Boxes.

Correct airflow velocity is critical to the performance of an Air Shower Pass Box. Adequate airflow ensures:

• Effective removal of surface particles
• Stable internal pressure and airflow uniformity
• Compliance with ISO, GMP, and hospital infection control standards
• Consistent and repeatable cleaning results

When airflow drops below the design threshold, the air shower function becomes ineffective, defeating its contamination control purpose.

Pre-filters are the first barrier capturing large dust particles. Over time, accumulated dust increases resistance and restricts airflow.

Symptoms:

• Gradual airflow reduction
• Increased fan load or noise

HEPA filters can become clogged with fine particles or lose efficiency after extended use.

Symptoms:

• Sudden or persistent airflow drop
• Increased pressure differential across the filter

Fan wear, motor aging, or bearing damage can significantly reduce air volume.

Symptoms:

• Abnormal noise or vibration
• Delayed startup or unstable operation

Dust accumulation, packaging debris, or foreign objects may block air shower nozzles.

Symptoms:

• Uneven airflow distribution
• Weak or inconsistent air jets

Voltage instability, control panel errors, or faulty sensors may prevent the fan from operating at full capacity.

Symptoms:

• Fan running at reduced speed
• Intermittent airflow during operation cycles

• Check internal chamber cleanliness
• Inspect nozzles for visible blockages
• Confirm doors are fully closed and interlocks engaged

• Remove and inspect pre-filters
• Clean reusable filters or replace disposable ones
• Reset maintenance indicators if applicable

• Measure pressure drop across the HEPA filter
• Conduct airflow velocity testing
• Replace HEPA filters if resistance exceeds design limits

• Listen for abnormal noise or vibration
• Verify fan rotation direction and speed
• Inspect electrical connections and motor condition

• Check control panel settings
• Confirm correct voltage supply
• Inspect sensors, timers, and safety interlocks

To minimize low airflow issues:

• Establish a regular filter inspection and replacement schedule
• Keep internal chambers and nozzles clean
• Avoid overloading the pass box with large or dense materials
• Ensure proper operator training and standard operating procedures (SOPs)
• Maintain detailed maintenance and inspection records

Preventive maintenance is always more cost-effective than reactive repairs.

If low airflow persists after basic troubleshooting, professional technical support is recommended. Situations requiring expert intervention include:

• Repeated HEPA filter clogging
• Fan or motor failure
• Control system or electrical faults
• Compliance testing for GMP or ISO certification

Attempting unauthorized repairs may compromise safety and certification compliance.

Low airflow in an Air Shower Pass Box is a critical issue that directly affects contamination control performance. By understanding common causes and following a structured troubleshooting approach, most airflow problems can be quickly identified and resolved.

Consistent maintenance, proper operation, and timely professional support ensure that the Air Shower Pass Box continues to deliver reliable, efficient, and compliant performance in cleanroom environments.