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The HamiltonBuhl Manual pull down wall or ceiling mounted projection screen is perfect for classrooms, conference rooms and inexpensive home theater applications.The HamiltonBuhl Manual projector screen is a great alternative to an electric projection screen, at a fraction of the cost. The manual screen operates just like a standard window shade, revealed by simply pulling the handle down and retracting with the same ease. The screen is height adjustable, using a stop-start feature, that allows the user to lower it to any desired height to accommodate different projection sources and formats.