CZ02 – Ozone Concentration Test Summary

Guangdong Detection Center of Microbiology

Report No.: 2021FM08210R02Da

1. Testing Facility Credibility

The Guangdong Detection Center of Microbiology (GDDCM) is a CNAS-accredited national laboratory recognized for chemical, biological, and air-quality testing.

The laboratory meets ISO/IEC 17025 competence standards and is widely used for third-party verification of disinfection and air-purification devices.

2. Description of the Test

• Test Standard: HJ 504-2009 (Ozone concentration measurement in sealed test chambers)
• Device Tested: OH-FEEL Hydroxyl Air Protection System (Model CZ02)
• Sample Quantity: 4 units
• Test Chamber Volumes: 1 m³ and 10 m³
• Exposure Time: 1 hour
• Purpose: Measure ozone accumulation in confined environments

3. Key Results

1 m³ sealed chamber (1 hour): 0.095 mg/m³ (~47.5 ppb)

10 m³ sealed chamber (1 hour): <0.010 mg/m³ (<5 ppb)

4. Interpretation

The 1 m³ chamber represents an extreme and unrealistic confinement condition, far smaller than any vehicle, room, or indoor space.

Even under this stress test, ozone levels remained near international safety limits.

The 10 m³ chamber result demonstrates safe operation far below the internationally recognized 50 ppb indoor ozone health threshold.

5. Summary Statement

Testing confirms that the OH-FEEL CZ02 produces extremely low ozone levels in realistic indoor spaces below 10 m³.

Higher ozone values were observed only under artificially small 1 m³ stress chamber conditions.

These results validate that OH-FEEL portable and vehicle units operate safely within global ozone exposure guidelines.

Report Issue Date: 2021-06-18

This summary is provided for clarity. Refer to the original ozone concentration test report for full data and detailed methodology.