4″ Galvanized vertical guides with dual weather seals on interior and exterior to reduce cold air penetration and make for smooth noise reduced operation
Curtain constructed of double sided steel galvanized roll formed slat with liquid poured polyurethane insulation. 0.024″ thickness each side (0.048″ combined thickness)
Torsion spring balance system with solid steel shaft and maintenance free sealed bearings
Double galvanized steel angle bottom bar with weather seal