YES 45 FS/FI Storefront System SHEAR BLOCK ASSEMBLY VERTICAL MULLION SHEAR BLOCK SCREWS HEAD SHEAR BLOCK INTERMEDIATE HORIZONTAL SILL SILL FLASHING GLASS STOP The Shear Block Assembly method uses shear blocks to attach horizontal members to tubular vertical mullions. This allows for a stronger joint connection. Page-4 02-1009-05 | Effective Date: August 14, 2018