China’s GB 29539-2025 takes effect on 1 November 2026. For OEM and sourcing teams handling household and similar-purpose ventilating fans, the immediate job is not to guess efficiency thresholds: it is to confirm scope, lock the correct standard version, and reconcile every model with its production evidence.
GB 29539-2025 scope, version and model-evidence review Information checked 19 October 2026
The decision in one sentence
Official Chinese standard records identify GB 29539-2025 as the mandatory national standard for minimum allowable energy-efficiency values and energy-efficiency grades for household and similar-use range hoods and ventilating fans. It was published on 31 October 2025, is scheduled to take effect on 1 November 2026, and replaces GB 29539-2013 and GB 32049-2015 in full. The official record also identifies Amendment No. 1; the related notice shows a release date of 25 May 2026 with immediate effect.
That combination creates a version-control problem as much as a test problem. A buyer needs to know whether the product is in scope, which amended text governs the evaluation, whether the tested sample matches the production BOM, and whether model names are consistent across reports, labels, packaging and purchasing systems.
1. Decide whether the product is actually in scope
The title of the standard is deliberately specific: household and similar-purpose range hoods and ventilating fans. It is not a blanket rule for every industrial fan, AHU fan, special-purpose blower or HVAC component.
Do not classify a product from its English catalogue name, its appearance or the fact that it exhausts air. Give the intended use, installation arrangement, rated data, control method, sales description and target channel to a qualified China regulatory specialist or recognised laboratory. The decision should be based on the official standard text and Amendment No. 1.
Keep a short written classification record containing:
- the sales model and model family;
- intended use and representative installation;
- the in-scope or out-of-scope conclusion;
- the official clauses and amendment version used;
- the reviewer and conditions that would trigger reassessment.
2. Control the version, not only the standard number
Writing “GB 29539-2025” on a test request is not sufficient when an amendment exists. The test order, supplier specification, compliance matrix, label artwork and release checklist should all state the version status that was used.
|
Control point |
Evidence to retain |
Typical failure |
|---|---|---|
|
Official source |
Official metadata and controlled copy record |
Treating a training slide or third-party summary as the standard |
|
Version status |
Effective date and Amendment No. 1 status |
Testing to one version and labelling to another |
|
Scope |
Reviewed product-classification memo |
Inferring scope from a product name or shape |
|
Change control |
BOM, firmware, control-setting and critical-supplier changes |
Changing a critical part after testing without evaluation |
3. Connect the model, sample, BOM and report
Most evidence failures are not caused by a missing PDF. They happen because the available documents describe different products. Build a model-evidence matrix with one row for each sales model or technically justified family, linking:
1. the sales name, nameplate model and internal material code;
2. test-sample serial number and photographs;
3. released production BOM and critical components;
4. relevant motor, impeller, controller, capacitor or electronic-control data;
5. report number, sample description and test conditions;
6. model wording used on the energy label and market documents;
7. approved changes and the reassessment decision.
Where one report covers several models, document the family logic and show why the differences do not invalidate the regulated result. A shared enclosure is not, by itself, a technical basis for shared evidence. Motor, impeller, airflow path and control changes can affect performance.
4. Ask suppliers questions that can be verified
“Please send compliance documents” often produces a folder that cannot be audited. Replace it with a field-by-field request:
- What is the scope determination for this exact product, who made it, and which clause supports it?
- Does the report apply GB 29539-2025 together with Amendment No. 1?
- Are the quoted model, nameplate model, report model and label model identical?
- Does the tested sample use the same motor, impeller, controller and critical BOM as production?
- What model-family rule was accepted, and which differences require retesting or supplementary review?
- When will the label, manual, packaging and master-data changeover occur?
- Who decides whether later BOM, supplier or firmware changes require reevaluation?
Require the response to cite a file name, page or controlled record for every answer. Statements such as “passed”, “can comply” or “same as before” are not acceptance evidence.
5. Run a four-party reconciliation before 1 November
Bring sourcing, engineering, quality/regulatory and the supplier together around the same model list. The meeting is not a seminar about the standard. Its purpose is to release or stop each model.
|
Owner |
Input before the review |
Required output |
|---|---|---|
|
Sourcing |
Active and planned models, inventory, suppliers |
Document owner and due date for every model |
|
Engineering |
BOM, drawings, settings and change history |
Test-sample versus production reconciliation |
|
Quality/regulatory |
Scope memo, version, reports and label files |
Release decision and objective closure criteria |
|
Supplier |
Sample record, component evidence and report index |
Difference explanation, missing file or retest plan |
Use only three statuses: release, conditional release, or hold. Every condition needs an owner, due date and objective closure record. “Documents pending” is not a durable status once the implementation date arrives.
What a fan or motor supplier can—and cannot—prove
A component supplier can organise drawings, critical parameters, performance curves, BOM traceability, change notices and test conditions for the supplied scope. Longwell’s internal knowledge base includes catalogues, specification materials and performance curves that can support project evidence preparation.
Component data does not automatically prove that a complete ventilating product complies with GB 29539-2025. Scope, test-sample identity, regulated energy result, labelling and market responsibility remain with the applicable finished product and its responsible party. A qualified laboratory or regulatory team should confirm the test plan and conclusion against the official text.
Eight release gates for buyers
1. A written scope decision exists.
2. The controlled version records Amendment No. 1.
3. Sales, nameplate, report and label model names match.
4. The test sample matches the production BOM, with all differences assessed.
5. Model-family coverage has a technical basis.
6. Packaging, manuals, labels and master data change together.
7. Supplier change notification and reevaluation rules are active.
8. Every open gap has an owner, due date and acceptance record.
Frequently asked questions
Does GB 29539-2025 apply to every HVAC fan?
No. The official title is limited to household and similar-purpose range hoods and ventilating fans. Applicability to any specific product must be determined from the official scope, intended use and product characteristics.
Why must Amendment No. 1 be checked separately?
Because citing only the base number does not show that testing, specifications and labelling use the same version state. The amendment status and effective date should be explicit in controlled project documents.
Can an existing old-standard report simply continue to be used?
Do not decide from the report expiry date alone. Compare the old and new requirements, the amendment, the product configuration, model-family logic and any transition provisions, then obtain a decision from the responsible laboratory or compliance team.
Can models with the same enclosure share one report?
Not merely because the enclosure is shared. Motors, impellers, control electronics, airflow paths and control logic may change performance. Family coverage needs a technical rationale accepted by the responsible evaluator.
Can Longwell issue the finished-product compliance decision?
Longwell can prepare component evidence for the supplied fan or motor and support duty-point and configuration checks. It does not replace the finished-product responsible party, regulator or recognised laboratory.
Next action
If you are preparing a China-market ventilating-fan project, send the intended use, model list, rated data, BOM revision, existing report index and launch date to the Longwell engineering team. We can help organise a component evidence matrix and difference list; your compliance team or recognised laboratory remains responsible for scope and finished-product conclusions.
Official sources
- China national standard record: GB 29539-2025
- National Public Service Platform for Standards: detailed record
- Official national-standard amendment notice
Information checked on 19 October 2026. Standards and implementation requirements can change; recheck the official sources before procurement, testing or market release.
