Vanguard's Unique Features. It’s what’s inside that matters.
FiberCore® – Structural Technology – For additional strength and durability.
UltraCore® – Insulated Window System – Polyurethane-insulated windows
for indoor comfort and overall, top-quality window performance.
SecureSeal™ – Meeting Rail System – A fiberglass structural core with high-performance polyurethane insulation with a triple weather strip barrier.
WindBlock™ Weather stripping – This system stops wind and air by way of three continuous layers of weather stripping, featuring a center double Mylar fin for further protection. This sealing system blocks even the smallest amounts of air and ensures that your home’s comfort is not compromised.