In the U.S. construction industry, performance certification is not just a formality—it’s a legal and commercial requirement. For any window or door system used in new residential or commercial buildings, NFRC certification plays a crucial role in ensuring compliance, energy efficiency, and quality assurance. At KDSBuilding, all our aluminum, PVC, and wooden window and door systems are NFRC certified, meaning they have been independently tested and approved to meet U.S. energy and building code standards. This certification gives builders, architects, and developers full confidence that KDSBuilding products deliver consistent performance for every project.  What Is NFRC Certification? NFRC stands for the National Fenestration Rating Council, an independent, nonprofit organization that develops standardized testing and rating systems for windows, doors, and skylights in the U.S. Each NFRC label provides verified performance data for four key ratings: NFRC Label Item Description U-Factor Measures how well the window insulates. Lower values mean better thermal resistance. Solar Heat Gain Coefficient (SHGC) Measures how much solar radiation passes through. Lower SHGC = less unwanted heat. Visible Transmittance (VT) Indicates how much natural light enters the space. Air Leakage (AL) Indicates how much air passes through the window assembly. Lower AL = tighter performance. These values are critical for compliance with IECC, Energy Star, and state-level energy codes like Title 24 (California).  Why NFRC Certification Matters to Contractors and Builders 1. Compliance with U.S. Building Codes Nearly all U.S. states now require NFRC-labeled products to obtain energy code approval. Using uncertified windows can lead to permit rejections or inspection failures, delaying projects and increasing costs. NFRC-certified windows help contractors: Pass state and local inspections easily Meet LEED and Energy Star program requirements Ensure building performance consistency 2. Assurance of Tested Quality Every NFRC-certified window or door is tested in accredited laboratories following ASTM and AAMA standards. This guarantees: Verified thermal insulation performance Verified solar control and air infiltration data Long-term reliability and warranty protection When working on government, hospital, or school projects, NFRC certification is often mandatory for approval. 3. Energy Efficiency and Cost Savings Builders using NFRC-certified windows deliver measurable energy savings to property owners. Proper U-Factor and SHGC ratings help: Reduce HVAC load and electricity costs Maintain interior comfort Lower environmental footprint For northern U.S. regions (cold climates), a low U-Factor (<0.30) is essential. For southern, sun-exposed regions, a low SHGC (<0.25) helps control solar heat. 4. Boosting Reputation and Market Value Contractors and developers who use certified, tested products gain a stronge...

New high-performance glazing meets NFRC energy standard requirements and supports Title 24 compliance Xiamen, China – – Xiamen KDSBuilding Material Co., Ltd. is proud to breakthrough in insulated glass engineering for high-performance windows and doors. The company’s newly developed double-glazed Low-E insulated glass achieves U-Factor as low as 0.23 Btu/hr·ft²·°F and Solar Heat Gain Coefficient (SHGC) as low as 0.19, setting a new standard in energy-efficient fenestration solutions for global markets. This glass system has been tested and calculated according to ASHRAE and NFRC 100-2010 standards and is designed to support NFRC certification applications and meet California Title 24 energy efficiency requirements, making it ideal for high insulation buildings in the United States and Canada.     Tested using Lambda 950 UV spectrometer and Spectrum 100 infrared analyzer. This innovation is the result of continuous research and dedicated engineering effort. The KDSBuilding R&D team spent over 14 months optimizing glass coating formulas, spacer system design, and thermal bridge control. “Our engineering team worked day and night to push the limits of glass energy performance,” said Mr. Zhang, Chief Engineer at KDSBuilding. “With this level of insulation and solar control, builders can now achieve Passive House and Net Zero standards more easily.” “With the breakthrough of this new glass, our windows and doors can meet California Title 24 compliance and NFRC standards. This will be beneficial for us to expand our business across America and the global market, as stated by Mr. Ken, the General Manager of KDS Building. "We will strive to research new types of glass for windows and doors that can bring more benefits to our lives." “This type of glass was developed in time” said Ms. Kelly, Sales manager for trade department” One of our customer in California just have a project and need low U-Factor and low SHGC parameter glass window for his project. We all happy to can reach a business partnership.” Key Benefits: • Ultra-low energy consumption performance • Reduces heating & cooling costs up to 45% • Prevents condensation and improves indoor comfort • Ideal for cold regions and high solar radiation regions • Supports NFRC certification applications • Compatible with Title 24 building energy compliance in California This insulated glass will be used in KDSBuilding’s aluminum thermal break windows,UPVC windows,  tilt & turn windows, casement & awning windows, lift & slide & folding door systems, and curtain wall projects. Xiamen KDSBuilding Material Co., Ltd. is a professional manufacturer of aluminum and uPVC windows and doors with over 15 years of industry experience. The company provides NFRC-compliant and energy-efficient window systems to customers worldwide. Website: www.kdsbuilding.com Email: Ken@kdsbuilding.com Factory: Xiamen, China

Windows and doors are essential elements in every building, not only providing light, ventilation, and access, but also ensuring comfort, energy efficiency, and security. Like any long-term investment, proper care and maintenance are necessary to keep them functioning well and looking new. With the right upkeep, modern windows and doors—whether PVC, aluminum, steel, or wood—can last for decades. Below are practical tips to help you extend their lifespan. 1. Regular Cleaning Clean windows and doors at least twice a year, or more often if you live in a coastal or dusty area. Use mild soap and water for glass surfaces, wiping with a soft cloth to prevent scratches. Avoid harsh chemicals or abrasive materials that could damage special coatings. For frames, PVC and aluminum should be cleaned with non-abrasive cleaners, while wooden frames need gentle cleaning and periodic refinishing to prevent moisture damage. 2. Care for Tracks, Hinges, and Hardware Dirt and dust often build up in sliding tracks and around hinges, causing windows and doors to operate less smoothly. Vacuum tracks regularly and wipe with a damp cloth. Hinges, locks, and handles should be lubricated once or twice a year with silicone spray or light oil to ensure effortless movement. Avoid heavy grease, as it tends to attract more dust. 3. Inspect Weatherstripping and Seals Seals and weatherstripping play an important role in energy efficiency and water resistance. Over time, they can crack, shrink, or lose flexibility. Inspect them every season and replace when necessary. Also check caulking around frames; reapply if you notice cracks or peeling. Well-maintained seals reduce air leaks, lower energy bills, and protect interiors from moisture. 4. Moisture and Drainage Management Windows and doors are designed with small drainage holes to let water escape. Keep these openings free of debris to avoid water accumulation and leaks. For wooden frames or doors, look for swelling, peeling, or rot. Sand, repaint, or reseal exposed areas to maintain a strong moisture barrier. 5. Glass and Frame Care Examine glass panels for cracks or chips, as even small damages can spread over time. Replace damaged panes quickly to maintain safety and insulation. Check frames for dents, warping, or corrosion, depending on the material. Tighten any loose screws in handles, locks, and hinges. 6. Proper Use and Handling Gentle operation is key to long-lasting windows and doors. Avoid slamming them shut or forcing them open if they stick. For sliding systems, do not overload handles or lean on panels. Small habits in daily use can significantly extend the product’s life. 7. Seasonal Inspection Before rainy or winter seasons, check windows and doors for insulation, water tightness, and overall performance. After heavy storms, inspect frames, seals, and glass for possible damage. Preventive maintenance ensures long-term durability. Conclusion Windows and doors are designed to last 20–30 years or more with the right ma...