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Double Glazed Window Installation Double glazing can make a big impact on your home by providing thermal insulation as well as noise reduction and security. But installing double glazed windows isn't a DIY job. Choose a FENSA approved installer to reap the benefits of your investment. The installer will begin by making the frames and brickwork to install the windows to be installed. Frame The frame of a double-glazed window is usually made from uPVC or aluminium. It is a frame that supports the glass