High Power Model B Manual Screen - 37.5" x 67" HDTV Format Model B with High Power 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. High Power is a technological breakthrough, providing the optical characteristics of glass beaded surface with no resolution loss and the ability to clean the surface. Moderate viewing angle and the capacity to reflect light back along the projection axis make this surface the best choice for situations where there is a moderate amount of ambient light and the projector is placed on a table-top or in the same horizontal viewing plane as the audience. Gain 2.8 with a 30-degree viewing half angle.