Designed for low- and mid-rise applications, the durable framework of the 400 Series Curtainwall provides exceptional structural performance reducing the need for steel reinforcing. This system has a sightline of 2-1/2" and the strength of variable-depth backmembers from 3-3/8" to 8". An exterior screw-applied pressure bar secures the glass. Snap-on covers, available in a wide range of colors, allow for different finishes on interior and exterior exposed surfaces. Silicone-glazed verticals are available for a seamless appearance.