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 L980 & L980A Keyed Removable Mullions 12-HD980 Heavy Duty Steel Mullion 980S & 12-980 Removable Mullions