Building system door and window product certification

Core Content of Certification

The Building System Doors and Windows Product Certification focuses on the systematic performance of door and window products, with the core evaluation covering the following dimensions:

Material and Construction Requirements: The materials and construction of system doors and windows determine whether they can achieve the system's requirements. The standard specifies specific indicator requirements for profile wall thickness, glass configuration, and hardware load-bearing capacity. Generally, profiles for system doors and windows should be of high-precision or ultra-high-precision grade, with the actual measured wall thickness of main load-bearing aluminum profiles not less than 1.8mm. Glass configurations typically require insulated glass units, which can be filled with inert gases such as argon to improve thermal insulation performance. Common configurations include 5mm+12A+5mm, 5mm+15A+5mm, 5mm+20A+5mm, or laminated insulated glass such as 5mm+0.76PVB+5mm+12A+5mm. The repeated opening and closing performance of hardware should reach more than 20,000 cycles.

System Design and Management Requirements: The certification not only assesses the door and window materials and performance themselves but also imposes requirements on system design methodology, system technical documents, system manufacturing, and system maintenance, including standardized design processes, calculation reports, design reviews, type tests, and ongoing confirmation. The standard defines the design process of system doors and windows as five steps: setting target values, scheme design, design calculation and analysis, performance verification, and system confirmation.

Mechanical Performance: Includes wind load resistance performance (graded testing of the load-bearing capacity of door and window structural members and glass under wind loads), opening and closing force (evaluating the operating force required for normal use of doors and windows, related to hardware smoothness and installation precision), and repeated opening and closing durability (simulating the fatigue life of daily use of doors and windows). The wind load resistance performance for external doors and windows should not be lower than Grade 3.

Thermal Performance: Includes heat transfer coefficient (a core indicator for measuring the thermal insulation performance of doors and windows; the smaller the value, the better the insulation), solar heat gain coefficient (reflecting the shading and heat insulation capability of doors and windows), and air tightness (reflecting the ability of doors and windows to prevent air infiltration). The heat transfer coefficient of external doors and windows should meet the requirements of corresponding energy-saving design standards.

Water Tightness Performance: Evaluates the ability of doors and windows to resist rainwater leakage under simultaneous wind and rain conditions, simulating the resistance of doors and windows to rainwater intrusion during typhoons, rainstorms, or continuous rainfall. The water tightness performance of external doors and windows should not be lower than Grade 3.

Air Tightness Performance: Evaluates the ability of doors and windows to prevent air infiltration in a closed state by measuring the air leakage rate per unit length of opening seam or per unit area. The air tightness performance of external doors and windows should not be lower than Grade 7.

Sound Insulation Performance: Evaluates the ability of doors and windows to block outdoor noise, used to assess sound insulation and noise reduction effects in buildings located near streets or in noise-sensitive areas.

Daylighting and View: Evaluates the light transmittance reduction factor and view size of doors and windows, important parameters for measuring building daylighting and ventilation functions.

Weather Resistance Performance: Includes weather resistance of thermal insulation materials, impact resistance performance, and glass impact resistance performance.

Certification Levels and Evaluation System

According to the GB/T 39529-2020 standard, this certification adopts a pass/fail evaluation method to comprehensively assess system door and window products. Type tests confirm whether the product meets all the technical indicators specified in the standard, and ultimately, system door and window product certification certificates are issued to enterprises that meet the requirements. The performance indicator levels refer to corresponding product standards. The core logic of the evaluation system is that the higher the degree of conformity of the door and window product to the system technical documents, and the closer the performance level is to the design target value, the higher the degree of completion of the system.

Certification Process

The Building System Doors and Windows Product Certification typically consists of the following stages:

Application for Certification: Submit the application form, business license, product technical documents (system design plan, technical drawings, profile cross-section diagrams, hardware configuration tables, glass configuration descriptions, etc.), and relevant raw material inspection reports. The certification body conducts a preliminary compliance review of the application materials.

Product Sampling and Testing: Personnel appointed by the certification body go to the production site or finished product warehouse for sampling. Samples are sent to a laboratory with CNAS and CMA qualifications for testing. Test items include wind load resistance performance, air tightness performance, water tightness performance, heat transfer coefficient, solar heat gain coefficient, airborne sound insulation performance, repeated opening and closing durability, and opening and closing force.

Initial Factory Inspection: On-site audit of the manufacturing enterprise, including inspection of the enterprise's quality assurance capability (incoming raw material inspection, process control, outgoing inspection) and product consistency check (ensuring that the actual production product is consistent with the submitted sample). Key areas reviewed include profile cross-section structure, profile wall thickness, thermal break material and dimensions, hardware brand and model, glass structure and thickness, and sealing gasket material.

Rectification and Re-verification: For non-conformities identified during the audit, the enterprise completes rectification within a specified period and submits evidence for review by the audit team.

Certification Decision and Issuance: After passing all tests, the certification body issues a formal test report and certification certificate, clearly stating that the product meets the requirements of the GB/T 39529-2020 standard, and affixes the CNAS or CMA mark.

Post-Certification Surveillance: Regular surveillance audits are conducted after certification to confirm that the product continues to meet certification requirements. Surveillance includes inspection of factory quality assurance capability, product consistency, and product surveillance testing.

Value of Certification

Enhancing Product Market Competitiveness: The certification certificate is an important proof of the quality of system door and window products and serves as a key qualification document in bidding and procurement activities such as government procurement, large-scale engineering projects, and real estate development.

Promoting Healthy Industry Development: As a foundational standard for the door and window industry, GB/T 39529-2020 for the first time proposes full-process control requirements for the design, manufacture, installation, and acceptance of door and window products from a system level. The establishment of the certification system effectively promotes the standardized development of the system door and window market, prevents the use of inferior products and false advertising, and provides a unified evaluation basis for material selection and acceptance of door and window projects. Institutions such as the China Academy of Building Research Certification Center have already carried out system door and window product certification work.

Ensuring Building Engineering Quality: System door and window certification ensures the quality of door and window projects from the source of product performance, promoting building energy conservation and consumption reduction.