138 Series Ultra-Insulated uPVC / Vinyl Flanged Single Hung Windows
Introduction:
The 138 Series Ultra-Insulated uPVC / Vinyl Single Hung Windows elevate the traditional American single hung design with a heavy-duty, high-insulation profile structure. Featuring a fixed upper sash and a vertically sliding lower sash, it provides controlled ventilation with enhanced sealing performance.
The 11-chamber uPVC profile significantly improves thermal efficiency and structural stability, making it suitable for energy-conscious residential projects. Equipped with American VIG hardware, this system delivers smooth operation and dependable durability, meeting the expectations of premium North American housing developments.