high contrast audio vision perm-wall fixed frame screen - 37 1 2 x 67 hdtv format size 40 1 2 x 72
96539 size 40 1 2 x 72 features - designed for permanent mounting to the wall or in a wall opening..-front or rear projection surfaces snap easily on to the front of the black powder coated aluminum frame..-flat back and sides for easy installation..-provides a perfectly flat viewing surface for graphic and data video projection . . screen material high contrast audio vision with the same optical characteristics as the high contrast da-mat material this surface is designed to provide the viewer with a more realistic soundstage by placing speakers behind the screen and allowing the sound to be transmitted through the material . this screen surface is best used when there is good control of ambient lighting and a moderately wide viewing angle is desired . screen surface can be cleaned with mild soap and water . flame retardant and mildew resistant . viewing angle 45 gain 0.8