The Dalite 37036L Large Advantage Electrol Projection Screen is a unique design. Construction of this ceiling recessed screen permits the case to be installed first and the fabric added later once a suitable projection surface is decided on. Thi…s is a big “plus” since companies constructing viewing rooms may not be certain of what they need in a screen. However, the Advantage permits the basic frame to be installed in the ceiling – ready for a finished fabric assembly to be added when all is prepped. It is designed for larger projection venues such as auditoriums, theaters and lecture halls. The system contains a rugged braking system that stops the screen at exactly the height you want it without any “coasting”. The motor is oiled-for-life and contains a thermal cutout switch to help prevent burnouts. The junction box is integrated into the housing which facilitates hooking the screen up to the house electrical system. The exceptionally quiet motor gives it an edge over similarly priced screens. Quiet “up” and “down” operation makes the Advantage more professional in appearance as well as less distracting to your audience.Product Features:Da-Lite 37036L Large Advantage Electrol Motorized Projection Screen (135 x 240″)Surface: Da-MatFormat: HDTV (16:9)