The Model B wall screen is perfect for classroom and meeting room facilities. Easy pull-down system locks at intervals to fit a variety of projection formats. Nylon bearings provide smooth quiet operation for the life of the screen. Case design allows for hanging from a ceiling or flush mounting to a wall. Matte White is the most versatile screen surface and the premier choice when ambient light is controllable. It evenly distributes light over a wide viewing area while colors remain bright and life-like, with no shifts in hue. Screen surface can be cleaned with mild soap and water. Flame retardant and mildew resistant. Viewing Angle: 50°, Video Format (4:3).