Product Selection Guide YKK AP PRODUCT YUW 750 XT High performance, unitized curtain wall system. YUW 750 XTH - High performance, impact resistant, unitized curtain wall system. 2500 PG Wall™ - - CURTAIN WALLS - PRODUCT COMPARISON EFCO KAWNEER X-Therm® 8750XD 2500 UT Unitwall™ OLD CASTLE BUILDING ENVELOPE Signature Series Unit Wall US ALUMINUM - Page-24 PS-1000-09 | Effective Date: September 23, 2022