HC980 & 12-HC980 Removable Mullions Designed for severe wind load conditions due to hurricanes or windstorms, the HC980 & 12-HC980 Removable Mullions are tested to Dade County protocols and ASTM Standards. Available with a fire rating. Downloads Catalogs Instruction Manuals Promotional Sheets Product Templates Parts Manual Interested in this product? Contact Us Related products 650A Removable Mullion EL980 Electrified Keyed Removable Mullion 988 Surface Bolt Kit