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13. What is the minimum wall size? 

2-5/8″ for 1-3/8″ frames or cased opening profiles 2-7/8″ for 1-3/4″ frames 4″ for 1-3/8″ X 1-3/4″ communicating frames 4-1/2″ for 1-3/4″ x 1-3/4″ communicating frames.

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