Series 526 is a thermal storefront framing system developed and tested to the most stringent impact requirements using dry-glazed interior and exterior gaskets eliminating the usage of any structural silicone sealants. Series 526 is compatible with all EFCO standard 1 3/4" and 2" DuraStile® doors. Series 526 framing system is fabricated with shear blocks or screw spline configurations, which contributes to the system's design flexibility. The system utilizes #12 fasteners in a screw spline application, allowing for fabrication of ladders prior to installation and overall quicker installation time.