Heavy .062 aluminum extrusion with structural thermal barrier for maximum strength and insulation. Double Fin Seal weather-stripping for minimum air infiltration even during extreme cold when most weather-stripping fail. Double strength glass with 1/2 inch spacer for twice the dead air space. Polyurethane thermal breaks in all frame and sash components to minimize heat and cold transfer. Large bulb seal for sure sealing under all weather conditions.
U-Factor .40 / SHGC .23
H-C35 Commercial Rated Performance