91A

Armstrong World Industries, Inc., together with its subsidiaries, engages in the design, manufacture, and sale of ceiling and wall solutions in the Americas. It operates through Mineral Fiber and Architectural Specialties segments. The company offers mineral fiber, fiberglass wool, metal, wood, felt, wood fiber, and glass-reinforced-gypsum; ceiling component products, such as ceiling perimeters and trims, as well as grid products that support drywall ceiling systems; ceilings, walls, and facades for use in commercial settings; and manufactures ceiling suspension system (grid) products.