Most storefront systems are designed as “flush glaze” with no projecting stops, giving it a clean look. Commercial storefront systems are intended to be single span structures, with anchors at the head and sill only. The frames are installed between and anchored to the building structure. Frame heights of 10 to 12 feet can be expected of most aluminum-framed storefront systems. Some systems with a deeper profile can be used to heights of up to 14 feet.