FAQs

A certificate should never be used to represent every product.
Testing and certification normally apply to specific product systems, sizes, glazing configurations and performance conditions. Before your order is confirmed, DTOP can help identify the available documentation for the selected system and project requirements.

That is one of the biggest risks in overseas window purchasing — so dimensions should be checked before production, not after delivery. 

DTOP can review your window and door schedules, drawings, opening sizes, handing and configurations before production. Final dimensions and specifications are confirmed before manufacturing begins.

You do not need to start with a perfect purchasing list.

Builders, contractors and developers can send architectural drawings, elevations, window schedules or preliminary dimensions. Our team can review the project information and help organize the window and door requirements for quotation and production confirmation.

There is no single specification that fits every project or every location.

Requirements depend on the country, state/province, building type, climate, wind exposure and project specifications. DTOP reviews the project requirements first and then recommends suitable product configurations and available supporting documentation.

For example, U.S. projects commonly evaluate thermal performance such as U-factor and SHGC; Canadian specifications can reference NAFS and Canadian supplements; and Australian NCC provisions reference AS 2047 for applicable external windows and framed glazed doors.

Then we should not force a standard product into the project.

DTOP supports customized sizes, glazing, opening styles, frame configurations, finishes and hardware options based on project requirements. We review the specification before recommending a system.

Ask us for the actual performance information for the selected system, rather than relying only on general marketing claims.

Depending on the product, relevant information may include:

  • U-Factor
  • SHGC
  • Air Infiltration
  • Water Penetration
  • Structural Performance
  • Glazing Configuration
  • Test or Certification Documentation

For energy performance specifically, U-factor, SHGC, air leakage and condensation resistance can all matter depending on climate and project goals.

The best time to find a problem is before the container leaves the factory.

DTOP carries out pre-shipment checks based on the product and project, including key dimensions, appearance, glass configuration, hardware operation, opening function and packaging condition.

Customers can also request project photos, videos or relevant inspection information before shipment.

International shipping is very different from local delivery, so packaging matters.

DTOP prepares windows and doors for export transportation with protective packaging suited to the product and shipment. Packaging condition can also be checked before loading.

For large doors, oversized glass or complex project orders, packaging and loading arrangements can be discussed before shipment.

Overseas purchasing should not end when the payment is completed.

DTOP provides project coordination and after-sales communication from quotation and drawing confirmation through production and shipment. We also have showrooms and local partners in markets including the United States, Canada and Australia to support customers closer to their projects.

A low initial price is not useful if important specifications were left out of the quotation.

To prepare a more accurate quote, DTOP recommends confirming key information such as dimensions, quantity, glass, frame finish, hardware, opening type, performance requirements and delivery destination before order confirmation.

Any changes to the agreed specifications should be identified and confirmed before production.

There is no reliable one-size-fits-all lead time for a custom project.

Production time depends on product type, quantity, customization, glass, hardware and final drawing approval. Shipping time also depends on destination and logistics arrangements.

Once your project details are confirmed, DTOP can provide a project-specific production and delivery schedule.

You can start with whatever project information you already have.

For the most accurate quotation, send:

  • Architectural drawings or window schedules
  • Window and door dimensions
  • Quantity
  • Opening types
  • Glass requirements
  • Frame color / finish
  • Performance requirements
  • Project city, state/province and country
  • Project photos, if available

Even if your drawings are not final, send them to us first. We can review the project before preparing the quotation.

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