Check out this web site: http://www.tpub.com/content/construction/14026/css/14026_147.htm I went around my house and found them to be, floor to bottom of box, anywhere from 10 to 12 inches. The above website says you can put it anywhere you want but 12 inches from floor to center of box is common... Adios.. Jasper Jasper Castillo
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