Accurate testing under ISO 16890 is essential for reliable air filter classification. However, in real-world laboratories, many errors can affect test results and lead to incorrect conclusions.
In this article, we highlight the most common ISO 16890 testing mistakes—and how to avoid them.
1. Unstable Airflow Control
Problem
Airflow fluctuations during testing can significantly affect filtration efficiency and pressure drop measurements.
Impact
- Inconsistent test results
- Poor repeatability
- Incorrect classification
Solution
✔ Use a system with precise and stable airflow control
✔ Regularly calibrate airflow sensors
2. Inaccurate Particle Measurement
Problem
Particle counters may produce inaccurate readings due to poor calibration or incorrect positioning.
Impact
- Wrong PM1 / PM2.5 / PM10 efficiency
- Misleading performance data
Solution
✔ Use high-precision particle measurement systems
✔ Ensure proper upstream/downstream sampling
3. Ignoring the Discharge Process
Problem
Some laboratories skip or improperly perform the discharge (conditioning) step.
Impact
- Overestimated efficiency
- Non-compliance with ISO 16890
Solution
✔ Always perform proper discharge
✔ Use integrated conditioning systems
👉 This step is critical to simulate real-world filter performance.
4. Inconsistent Dust Feeding
Problem
Unstable or uneven dust feeding during loading tests.
Impact
- Irregular pressure drop curve
- Unreliable efficiency trend
Solution
✔ Use automated and controlled dust feeding systems
✔ Monitor dust concentration continuously
5. Poor Test System Sealing
Problem
Air leakage in the test rig can bypass the filter.
Impact
- False low efficiency results
- Incorrect classification
Solution
✔ Ensure proper sealing of the test system
✔ Perform regular leak checks
6. Incorrect Filter Installation
Problem
Improper installation or positioning of the test filter.
Impact
- Air bypass
- Non-representative results
Solution
✔ Use standardized fixtures
✔ Ensure correct mounting and alignment
7. Lack of System Calibration
Problem
Failure to regularly calibrate sensors and instruments.
Impact
- Long-term data drift
- Reduced accuracy
Solution
✔ Schedule periodic calibration
✔ Maintain calibration records
8. Environmental Factors Ignored
Problem
Temperature and humidity variations are not controlled.
Impact
- Affects particle behavior
- Impacts measurement stability
Solution
✔ Maintain stable lab conditions
✔ Use environmental control systems
9. Low Automation Leading to Human Error
Problem
Manual operation increases variability and errors.
Impact
- Poor repeatability
- Time-consuming testing
Solution
✔ Use automated testing systems
✔ Reduce operator dependency
10. Using Non-Compliant Test Equipment
Problem
Some systems do not fully meet ISO 16890 requirements.
Impact
- Invalid test results
- Certification issues
Solution
✔ Choose fully compliant systems
✔ Verify system capabilities before testing
11. Recommended Solution for Reliable Testing
To avoid these common issues, a professional testing system is essential.
The SC-16890 General Ventilation Filter Test System from SCPUR is designed to eliminate these problems.
Key Benefits
- Stable airflow control
- Accurate particle measurement
- Integrated discharge system
- Automated dust loading
- High repeatability
👉 Helps ensure accurate, consistent, and compliant test results.
12. Conclusion
ISO 16890 testing requires not only understanding the standard but also avoiding common operational and system-related mistakes.
By addressing these issues and using the right equipment, laboratories can ensure:
✔ Reliable data
✔ Accurate classification
✔ Compliance with international standards
