Marketing Information This inconspicuous Lay-in Speaker can be installed in suspended ceilings in a minute. The speaker provides excellent music and voice reproduction. The integral backbox has a three hour burn test rating (UL181) and the rugged lightweight construction eliminates the need for support bars. The speakers white perforated grille blends into the ceiling by providing the appearance of a standard air return. The speaker assembly features a perforated steel grill finished with a durable white baked on acrylic enamel finish, and a 8" full range speaker with volume settings.