 LANCASTER, Pa., Feb. 17, 2021 GLOBE NEWSWIRE -- Armstrong World Industries, Inc. NYSE:AWI, a leader in the design, innovation and manufacture of commercial and residential ceiling, wall and suspension system solutions, today announced that its Board of Directors has declared a cash dividend of 0.21 per share of common stock for the fourth quarter of 2020. The dividend will be paid on March 18, 2021, to shareholders of record as of the close of business on March 4, 2021. 