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PVC/UPVC Single Hung Sash Window and Door Profile. Superior Thermal Insulation: Heat insulation effect 1250 times better than aluminum material. High Sound Insulation: Sound insulation <20db, complying with DIN4109 standards. Fire Retardant Performance: Does not ignite or support combustion; extinguishes fire by itself. Customizable Options: Customized style, logo, and packaging details available for orders. Low Maintenance Design: Corrosion-resistant and does not yellow, requiring almost no maintenance. Fast Delivery Time: Normal delivery within 7-15 days after receiving 30% deposit.