Product Selection Guide STOREFRONTS - PRODUCT COMPARISON EFCO KAWNEER OLD CASTLE BUILDING ENVELOPE US ALUMINUM System 960 EnCore® - - YES 20 Sash Storefront System for Monolithic or Insulating Glass - - - - YHS 50 FS Impact Resistant and Blast Mitigating Storefront System for Monolithic Glass Series 525 (NT) IR 500 FG-5000 IG 500 YHS 50 FI Impact Resistant and Blast Mitigating Storefront System for Insulating Glass - IR 501 FG-5100 BR 604/606 Series 526 (T) IR 501 UT FG-5100 Thermal BR 601 YKK AP PRODUCT YES 600 Front Loading Thermally Broken Storefront System YHS 50 TU Thermally Broken Impact Resistant and Blast Mitigating Storefront System for Insulating Glass Page-12 PS-1000-08 | Effective Date: April 28, 2020