In November 2025, the manufacturer's in-house testing laboratory was accredited by CNAS for air-performance, sound, and vibration testing of fans, formalising its existing measurement capability.
A manufacturer's test report carries different weight depending on whether the laboratory behind it is accredited, because accreditation confirms the methods, equipment calibration, staff skill, and traceability meet recognised international criteria, turning an internal number into defensible evidence a customer can show a consulting engineer or authority. For fans, the three measurements that decide fitness for a specification are how much air and pressure the unit delivers, how loud it is, and how steadily it runs, and accreditation forces discipline on the unglamorous details, instrument calibration dates, documented procedures, and trained personnel, that separate a trustworthy test from a figure written on a sheet.
What CNAS Accreditation Means
CNAS (China National Accreditation Service for Conformity Assessment) accreditation confirms that a laboratory operates to recognised international criteria for competence, covering its methods, equipment calibration, staff skill, and traceability. For a fan maker, an accredited lab means test reports carry independent weight rather than being internal claims that a customer must take on trust.
The scope here covers the three measurements that decide whether a fan is fit for a specification: how much air and pressure it delivers, how loud it is, and how steadily it runs. Each answers a different buyer question: will it move the air, will it be quiet enough, and will it survive.
Accreditation also forces discipline on the boring but vital details: instrument calibration dates, documented procedures, and trained personnel. Those details are exactly what separate a trustworthy test from a number written on a sheet, and an auditor verifies them on a cycle.
Test Scope of the Laboratory
The accredited disciplines and what they verify are listed below.
| Test | Measures | Why it matters |
|---|---|---|
| Air performance | Flow vs pressure | Confirms the curve |
| Sound | dB(A) levels | Noise planning |
| Vibration | Bearing/imbalance | Reliability sign |
| Calibration | Traceable standards | Report credibility |
Vibration testing in particular catches impeller imbalance and bearing issues before shipment, the same faults that would otherwise surface as noise and early failure in the field. A fan that passes a vibration limit at the factory is far less likely to arrive with a damaged or poorly balanced rotor.
Sound measurement supports acoustic design. Quoted dB(A) values from a consistent method let a consultant place the fan in a noise budget with confidence, rather than guessing from an unverified figure that may use a different basis.
Checklist for Using Test Data
Engineers should ask for and apply lab data as follows to get real value from accreditation:
- Request the report: Accredited data should be available on request per model, not only for a showcase unit.
- Check the method: Confirm air performance follows a named standard so the curve is comparable to others.
- Read sound levels: Use measured dB(A) for realistic acoustic design and check the measurement condition.
- Track vibration: Low vibration correlates with longer bearing life, so include it in acceptance criteria.
- Trace calibration: Accreditation implies calibrated, traceable instruments, which is what makes the numbers defensible.
- Keep records: Store the accredited report with the project file for future audits and exact replacements.
Significance for Customers
Keruite has manufactured fans for 30+ years from its 80,000 m² Dezhou facility and already ran an in-house performance laboratory; CNAS accreditation now validates that practice to an external benchmark. With ISO 9001:2015 certification and export to 50+ countries, the company can back selection with defensible measured data.
For specifiers, the practical gain is selection confidence grounded in accredited testing, not estimated curves, and a report they can show a consulting engineer or authority. the company views the lab as central to its offer, because measured data is what turns a fan from a commodity into a specified component.
For engineers, the value is realised by requesting the accredited report per model, confirming air performance follows a named standard so curves compare fairly, and using measured dB(A) for realistic acoustic design while tracking vibration as a proxy for bearing life in acceptance criteria. Low vibration correlates with longer bearing life and fewer early failures, and traceable calibration is what makes the numbers defensible in an audit. With 30+ years of fan manufacturing and ISO 9001:2015 certification at the 80,000 m² Dezhou facility, and exports to 50+ countries, the company can back selection with accredited, measured data rather than estimated curves.
The credibility of a test report rests on traceability as much as on the measurement itself, because an instrument that has drifted gives a confident but wrong number, and accreditation verifies the calibration chain from the sensor back to a national standard. For a buyer, that chain is what makes the supplier's curve defensible in an audit or a dispute, and it is why an accredited laboratory matters more than a larger unaccredited one. Vibration testing in particular pays back at the factory, catching impeller imbalance and bearing faults before shipment so the unit arrives balanced rather than as a noise and early-failure risk, and the result is documented for the project file.
Engineers in Dezhou respond to selection enquiries within 24 hours, and the factory ships most standard fans from its 80,000 m² site within agreed lead times.