YES 45 FS/FI Storefront System SCREW SPLINE ASSEMBLY HEAD VERTICAL MULLION SPLINE SCREWS SNAP IN FILLER INTERMEDIATE HORIZONTAL SILL YES 45 FI Shown YES 45 FS Similar The Screw Spline Assembly method uses a two piece vertical mullion. This allows the frame to be constructed in units and installed using screws driven through the back of the vertical mullions into the screw splines of the horizontal members. The units are then snapped together at the vertical to complete the fabrication. Effective Date: Aug 23, 2024 | 02-1009-07 SILL GLASS STOP FLASHING Page-3