YES 45 TU/FT Thermal Storefront System YES 45 TU SHEAR BLOCKâASSEMBLY SHEAR BLOCK MOUNTING SCREWS HEAD TUBULAR MULLION HEAD MOUNTING SCREW INTERMEDIATE HORIZONTAL SHEAR BLOCK SILL END DAM HORIZONTAL/SILL MOUNTING SCREWS SILL FLASHING Page-4 02-1003-12 | Effective Date: July 9, 2020