Door Manufacturer in China for Global Projects
To verify a fire door certificate, check three things: whether the document is authentic, whether its scope covers your ordered configuration, and whether the delivered product can be traced to that configuration. A genuine certificate for one door does not automatically cover every size, opening arrangement, hardware set or glass option sold by the supplier.
For importers, distributors, contractors and developers, the useful question is: Does the evidence cover the door we are buying for this particular opening?
This guide explains how to answer that question before approving drawings or starting production. It focuses on procurement verification, using a UL 10C / Intertek Warnock Hersey configuration as an example. Other certification systems require their own documents and verification procedures.
Start with the project’s door schedule and specifications. Confirm the destination market, intended opening, required performance, accepted standards and documentation requirements with the project team.
A request for a “90-minute fire door” leaves important questions unanswered:
Put these requirements in writing. A buyer’s willingness to accept a different product does not, by itself, establish that the product meets the project’s applicable requirements.
Buyers often use “certificate” to describe several different documents. Ask the supplier to identify each document and its purpose.
| Document | Procurement question it helps answer | What still needs checking |
|---|---|---|
| Fire test report | What specimen was tested, by which method, and with what result? | Whether the ordered construction is covered by the relevant supporting evidence |
| Product certification or listing | Which identified product is covered under the certification scheme? | Current status, construction limits, permitted components and applicable conditions |
| Classification report, where applicable | What classification was assigned under that system? | Its stated application scope and supporting documents |
| Controlled product drawings and specifications | What construction should be manufactured? | Their connection to the certification documents and order |
| Installation instructions | How should the specified product be installed? | Suitability for the actual opening and wall construction |
A test report and a product listing serve different purposes. Read the relevant supporting documents rather than relying on a cover page alone.
Intertek’s Inspector Information Center directs users to its online directories to verify certified products. Its Warnock Hersey Mark information describes the building-product certification mark and associated conformity controls.
Request enough information to locate the product independently:
For Intertek-certified building products, use the official Directory of Building Products. For UL-certified products, use UL Product iQ.
UL 10C is a test standard; Intertek Warnock Hersey identifies a certification scheme and mark. A door evaluated to UL 10C under Intertek certification should be checked through the relevant Intertek records. The words “UL 10C” do not, by themselves, mean that UL Solutions issued the certification.
Match the supplier’s documents to the official information. If names, models or document numbers differ, request an explanation supported by documents. A different seller and certificate holder may have a legitimate relationship, but the relationship should be clear for the actual supply arrangement.
If a record cannot be located, ask the issuing organization for clarification before drawing a conclusion. An unsuccessful search alone does not prove that a document is fraudulent.
Finding a genuine record is only the first part of verification. Now compare it with your quotation, door schedule and drawings.
| Item | What the buyer should compare |
|---|---|
| Product identity | Ordered model and manufacturing identity against the supporting documents |
| Rating and standard | Project requirement against the stated performance and test basis |
| Opening arrangement | Single-leaf, double-leaf or another arrangement |
| Dimensions | Ordered leaf and frame sizes against documented limits |
| Door construction | Facing, thickness, core, reinforcement and edge details |
| Frame construction | Profile, materials, fixing details and permitted installation |
| Glazing | Whether a vision panel is allowed and which complete glazing arrangement is covered |
| Hardware | Specified locks, hinges, closer and other components against permitted requirements |
| Seals | Required type, location and installation |
| Wall and installation | Actual wall construction and fixing method against applicable instructions |
Ask the supplier to point to the relevant document section for any uncertain item. Record “not yet confirmed” when evidence is missing; an unanswered question should not become an assumed approval.
Documented permitted variations may exist. Their extent depends on the particular system and product. Buyers should neither assume unlimited customization nor conclude that every difference from a tested specimen is automatically prohibited.
TOF Door’s configuration discussed here is UL 10C / Intertek Warnock Hersey, 90 minutes, single-leaf, without glazing. Certification documents are held by a TOF legal entity.
That description does not establish coverage for a double-leaf door, a glazed door or an arbitrary larger size. Exact dimensional limits, hardware requirements and installation conditions must be checked in the product’s current supporting documents.
For its certified supply, TOF Door follows the tested-sample drawings and documented manufacturing and installation methods. Buyers should agree on the configuration before production begins.
Common requests include increasing the size, changing a single-leaf door to a double-leaf arrangement, adding a glass opening, or replacing the core or hardware.
Treat each request as a configuration review. Ask:
TOF Door does not treat these changes as routine substitutions within its existing certified configuration. Where the change is outside the covered scope, the original documents cannot be used to represent the revised product as covered.
A rated glass component does not establish the rating of a modified door assembly. The aperture, glazing frame and installation arrangement also need appropriate coverage. UL’s Doors, Windows and Related Hardware Application Guide addresses glazing and related assembly conditions.
A TOF Door customer requested a glass opening in a door whose existing certification did not cover that arrangement. The discussion clarified the customer’s stated procurement requirements, and a customized glazed version was subsequently agreed.
The modified configuration had not undergone a fire test. It therefore could not be presented as covered by the original certification, and this example does not establish a verified fire rating for the modified door.
The lesson for buyers is to make the evidence boundary explicit before accepting a customized configuration. If a rated opening is required, obtain an appropriately covered solution and the necessary project acceptance.
Once the product has been reviewed, freeze the order configuration in a controlled drawing and specification set. Agree on which revision is the production reference and document any subsequent change.
Useful order records include:
At TOF Door, the complete drawing set and inspection records are retained. On-site delivery coordinators check production against the confirmed requirements. The door leaf carries a stamp identifying production time and batch.
A production batch stamp supports traceability; it is not automatically a certification mark. Buyers should separately check the identification and certification marking requirements applicable to their product.
A physical inspection can check visible conformity and records. It does not replace a fire test or independently establish a fire rating.
Before shipment, compare the finished supply with the agreed drawings, component specifications and inspection records. Confirm that product identification can be linked to the order and that the required instructions will reach the installer.
After delivery, check for damage, missing components and proposed site changes before installation proceeds. Keep the supplier’s installation instructions with the project records.
Wall construction and frame fixing matter. UL’s application guide notes that anchoring arrangements differ between wall types and directs users to the applicable installation requirements. A product suitable for one installation should not be assumed suitable for another without checking its conditions.
TOF Door provides installation instructions and advises against unreviewed changes to the supplied configuration. Requests to cut a vision panel, replace hardware or alter the frame should be referred back for review before work begins.
Use this table before placing an order or releasing production.
| Check | Evidence to request | Review status |
|---|---|---|
| Project requirements are defined | Door schedule and project specification | Confirmed / Pending |
| Document issuer and product identity match | Official directory record and supplied documents | Confirmed / Pending |
| Rating and standard meet the requirement | Relevant product documentation | Confirmed / Pending |
| Size and opening arrangement are covered | Scope information and order drawings | Confirmed / Pending |
| Construction, hardware and seals are covered | Product specifications and permitted component requirements | Confirmed / Pending |
| Glazing is covered, if specified | Documentation for the complete glazed arrangement | Confirmed / Pending / Not applicable |
| Wall and fixing method are suitable | Installation instructions and site details | Confirmed / Pending |
| Requested changes have been resolved | Written configuration review | Confirmed / Pending / Not applicable |
| Production reference is fixed | Agreed drawing and specification revisions | Confirmed / Pending |
| Delivered product is identifiable | Required marking and traceability records | Confirmed / Pending |
| Installer has the correct instructions | Product-specific installation package | Confirmed / Pending |
“Confirmed” should refer to identified evidence, not simply a verbal assurance.
No. Check the identified product and its covered configurations. A supplier may sell several products with different documentation and performance claims.
No. UL 10C identifies a test standard. Check the issuing organization and the relevant certification records. Intertek Warnock Hersey products should be verified through Intertek’s applicable information.
Do not assume so. The proposed glazed construction needs appropriate evidence. The original solid-door documentation and a separate glass rating are insufficient to establish coverage for the revised assembly.
Check the documented limits and permitted variations. A larger door requires confirmation of coverage; appearance and similarity are not evidence of approval.
A production stamp can identify a batch. Certification marking must be checked separately against the applicable scheme and product requirements.
Send the destination market, door schedule, performance requirements, dimensions, opening arrangement, glazing request, hardware requirements and wall details. Include the project’s documentation and acceptance requirements.
Contact TOF Door’s sales team with your door schedule and project requirements for a procurement review. The discussion should establish which configuration is needed, what evidence supports it and whether any requested customization falls outside the existing certified scope.
For certified products, the approved configuration and controlled production documents remain the reference throughout manufacture and delivery.
