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Hello, The in-wall box dimensions are 14.3" wide x 17" tall x 3.9" deep. With the trim ring installed, the finished opening is about 15.9" wide x 18.5" tall. SANUS Support
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Hello, The in-wall box dimensions are 14.3" wide x 17" tall x 3.9" deep. With the trim ring installed, the finished opening is about 15.9" wide x 18.5" tall. SANUS Support