The transcript doesn't specify the exact sizes (height and depth) of the racks featured, only that the width is the standard 19 inches and the height is measured in U units. To find the dimensions you would need to either watch the video or consult the Penn Elcom website for specifications on their product line.
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This video from eFIXX explores the history and applications of 19-inch racks, focusing on Penn Elcom's offerings for home AV, theaters, and smart homes. The presenters discuss the rack's origins, standard dimensions, accessories, and manufacturing process.
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