24 NOVEMBER 2025
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When specifying performance louvres, you’re not just choosing a product — you’re relying on verified, repeatable test data, to ensure airflow, rain rejection, and overall system performance match the design intent. With the updated AS 4740:2025 standard now in effect, it’s more important than ever to confirm that test certificates are genuine, compliant, and conducted under the right conditions.
All testing to AS 4740:2025 should be carried out by an independent facility, not by the manufacturer themselves. Why? Because independence removes bias and ensures the results you’re reviewing are authentic and reproducible.
Look for: • The facility’s name on the test report • A statement confirming independence • Clear alignment with the AS 4740:2025 methodology
If the manufacturer tested the product in-house, be cautious — this is not considered compliant.
A valid AS 4740:2025 test certificate must include sign-off by a Registered Australian Engineer.
Their signature confirms: • The test followed the correct procedure • Results are technically sound • Data is complete and unaltered
No signature = no verification.
The test facility should be accredited by a recognised authority — for example, NATA, or the rigs/tests/data/certifications have been quality assured and scrutinised by Chartered Professional Engineers.
This accreditation means the facility has been physically inspected and approved to conduct AS 4740 testing correctly. It confirms: • Equipment is calibrated • Staff are competent • Testing follows the standard rigorously
If there’s no accreditation, the results cannot be treated as compliant.
Even if the test results look genuine, the supplier’s quality management system matters. AS 4740:2025 acknowledges that compliance is reinforced when the manufacturer operates under: • AS/NZS ISO 9001, ISO 14001, and ISO 45001 or equivalent quality systems
This ensures that: • The tested louvre is the same as the one being supplied • Production is consistent • Documentation is properly controlled
Good testing on a poor QA system is still a mismatch.
Ensuring a louvre has been genuinely tested to AS 4740:2025 protects your design, your project performance, and your professional reputation. By following these simple checkpoints — independent testing, engineering sign-off, proper accreditation, and proven quality systems — you can confidently specify louvres that meet the standard, not just claim to.
https://louvreclad.victor.nichestudio.biz/insights/how-to-validate-as-47402025-test-certificates-for-performance-louvres/