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Bob discusses “fenestration,” which is the arrangement of openings—windows and doors—in a building, and then meets with carpenter Bob Ryley to install a Marvin thermopane window with true divided lights (TDL). To let in a lot of sunlight, a double window will be installed in the kitchen, which will give a view of the backyard. Bob notes the structural work that must happen before such a big opening is created. Ryley explains the window installation process, noting the flush casing and sheathing. Lastly, molding is applied to the casing for a finished look.