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Da-Lite 73560 Manual 50" x 50" Square Format Classroom Wall Screen with Video Spectra 1.5 Fabric, Model B with Video Spectra 1.5 fabric, Durable Manual Wall or Ceiling Screen. Perfect for classroom, meeting rooms or home theaters, 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 flush mounting to the ceiling or wall, Video Spectra 1.5 is specially designed with a reflective coating, which provides an increased amount of brightness with a moderately reduced viewing angle, The increased gain of this surface makes it suitable for environments where ambient lighting is uncontrollable and a projector with moderate light output is utilized. Gain 1.5 with a 35-degree viewing half angle.