12-HD980 Heavy Duty Steel Mullion Designed for double door applications from 8–10 feet, the HD980 Heavy Duty Steel Mullion is fire-rated and offers maximum strength and reliability when used with the 8800 Series Rim Exit Device. Downloads Catalogs Instruction Manuals Promotional Sheets Product Templates Parts Manual Interested in this product? Contact Us Related products HC980 & 12-HC980 Removable Mullions 980 & 980A Removable Mullions 988 Surface Bolt Kit