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Double Glazed Window Installation Double glazing can make a big difference to your home, providing insulation from heat, noise reduction and improved security. Installing double-glazed windows is not an easy task for the DIY-er. Work with an FENSA approved installer to reap the benefits of your investment. The installer will begin by building the frames, brickwork and new windows. Frame The frame of a double-glazed window is usually made of uPVC, timber or aluminium. It is a frame that holds the glass