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23179 The Da-Lite Thru-the-Wall Rear Projection Screen is a rear projection package that comes complete with a factory framed rear projection screen of your choice and a Rear Projection Module. The RPM is a precision made, aluminum extrusion based rear projection system custom engineered to meet the exacting requirements of today's digital projectors. The RPM is standard with a fine-tuning projector mount cradle, which provides a host of alignment adjustments and features a mirror mounted by a three-point suspension system to ensure superior stability and flatness. The Perfect Mirror Adjustment Systems is a standard feature on all mirror systems for 42'' x 60'' and smaller mirrors.